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Employee Benefit Plans Level 4 Defined Benefit Plan, Information about Plan Assets (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation | $ 5,734,000,000 |  | $ 6,025,000,000 |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation | 5,732,000,000 |  | 6,024,000,000 |  |
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets | 4,430,000,000 |  | 4,707,000,000 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels |  |  | (238,000,000) |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  | 257,000,000 |  | $ 391,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  | 4,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  | 7,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  | 242,000,000 |  |
Defined Benefit Plan Issuance | (17,000,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  | (193,000,000) |  |
Defined Benefit Plan, Transfers Between Measurement Levels |  |  | 44,000,000 |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels |  |  | (5,000,000) |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  | 34,000,000 |  | 12,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  | 12,000,000 |  |
Defined Benefit Plan Issuance | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  | (5,000,000) |  |
Defined Benefit Plan, Transfers Between Measurement Levels |  |  | 20,000,000 |  |
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  | 28,000,000 |  | 2,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  | 7,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  | 3,000,000 |  |
Defined Benefit Plan Issuance | (14,000,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  | (1,000,000) |  |
Defined Benefit Plan, Transfers Between Measurement Levels |  |  | 17,000,000 |  |
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  | 5,000,000 |  | 4,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  | 1,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  | 2,000,000 |  |
Defined Benefit Plan Issuance | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  | (2,000,000) |  |
Mortgage Loans on Real Estate, Loan Category [Domain] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Defined Benefit Plan Issuance | 0 |  |  |  |
Other Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels |  |  | (9,000,000) |  |
Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  | 9,000,000 |  | 12,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  | (5,000,000) |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  | 6,000,000 |  |
Defined Benefit Plan Issuance | (3,000,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  | (2,000,000) |  |
Defined Benefit Plan, Transfers Between Measurement Levels |  |  | 7,000,000 |  |
Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels |  |  | (224,000,000) |  |
Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  | 181,000,000 |  | 361,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  | 4,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  | 4,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  | 219,000,000 |  |
Defined Benefit Plan Issuance | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  | (183,000,000) |  |
Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Defined Benefit Plan Issuance | 0 |  |  |  |
Other Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels | (1,000,000) |  |  |  |
Other Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 2,000,000 |  | 3,000,000 |  | 0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Realized Gain (Loss) |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 1,000,000 |  | 3,000,000 |  |
Defined Benefit Plan Issuance | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (1,000,000) |  | 0 |  |
Other Pension Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 3,000,000 |  | 3,000,000 |  | 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 1,000,000 |  | 3,000,000 |  |
Defined Benefit Plan Issuance | (1,000,000) |  |  |  |
Other Pension Plan [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 0 |  | 0 |  | 0
Defined Benefit Plan Issuance | 0 |  |  |  |
Other Pension Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 0 |  | 0 |  | 0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Realized Gain (Loss) |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 |  | 0 |  |
Defined Benefit Plan Issuance | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 |  | 0 |  |
Other Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels | (1,000,000) |  |  |  |
Other Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 5,000,000 |  | 6,000,000 |  | 0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Realized Gain (Loss) |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 2,000,000 |  | 6,000,000 |  |
Defined Benefit Plan Issuance | (1,000,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (1,000,000) |  | 0 |  |
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | $ 0 |  | $ 0 |  | 0
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |  |
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Equity Securities | 20.00% |  | 21.00% |  |
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Debt Securities | 66.00% |  | 62.00% |  |
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Other | 14.00% |  | 17.00% |  |
Defined Benefit Plan Weighted Average Allocation Percentage of Assets | 100.00% |  | 100.00% |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | $ 4,470,000,000 | [1] | $ (4,727,000,000) | [2] |
Investment Payables Net of Investment Receivables | 0 |  | 0 |  |
Interest Receivables | 0 |  | 0 |  |
Defined Benefit Plan, Settlements, Benefit Obligation | $ 0 |  | 319,000,000 |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Support, Methodology and Source Data | 567 |  |  |  |
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | $ 821,000,000 | [1] | (1,041,000,000) | [2] |
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels | (128,000,000) |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 3,468,000,000 | [1] | (3,429,000,000) | [2] |
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 181,000,000 |  | 257,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | (1,000,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 103,000,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (38,000,000) |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels | 5,000,000 |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 181,000,000 | [1] | (257,000,000) | [2] |
Pension Plan [Member] | Short-term Investments [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (281,000,000) |  | (308,000,000) |  |
Pension Plan [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (7,000,000) |  | (56,000,000) |  |
Pension Plan [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (274,000,000) |  | (252,000,000) |  |
Pension Plan [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | $ 0 |  | 0 |  |
Pension Plan [Member] | Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 5.00% |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 20.00% |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | $ (385,000,000) |  | (438,000,000) |  |
Pension Plan [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (298,000,000) |  | (435,000,000) |  |
Pension Plan [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (87,000,000) |  | (3,000,000) |  |
Pension Plan [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | $ 0 |  | 0 |  |
Pension Plan [Member] | Fixed Income Funds [Member] |  |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 50.00% |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 70.00% |  |  |  |
Pension Plan [Member] | Alternative Assets [Member] |  |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 10.00% |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 45.00% |  |  |  |
Pension Plan [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | $ (941,000,000) |  | (953,000,000) |  |
Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 0 |  | 0 |  |
Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels | (14,000,000) |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (922,000,000) |  | (919,000,000) |  |
Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 19,000,000 |  | 34,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | (2,000,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 12,000,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (11,000,000) |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (19,000,000) |  | (34,000,000) |  |
Pension Plan [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (266,000,000) |  | (209,000,000) |  |
Pension Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 0 |  | 0 |  |
Pension Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels | (6,000,000) |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (242,000,000) |  | (181,000,000) |  |
Pension Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 24,000,000 |  | 28,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 14,000,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (2,000,000) |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels | 4,000,000 |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (24,000,000) |  | (28,000,000) |  |
Pension Plan [Member] | US Treasury Securities [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (1,048,000,000) |  | (1,227,000,000) |  |
Pension Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (16,000,000) |  | (24,000,000) |  |
Pension Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (1,029,000,000) |  | (1,198,000,000) |  |
Pension Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (3,000,000) |  | (5,000,000) |  |
Pension Plan [Member] | Foreign Government Debt Securities [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (54,000,000) |  | (70,000,000) |  |
Pension Plan [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 0 |  | 0 |  |
Pension Plan [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (49,000,000) |  | (65,000,000) |  |
Pension Plan [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 5,000,000 |  | 5,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | (1,000,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 1,000,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (5,000,000) |  | (5,000,000) |  |
Pension Plan [Member] | Mortgage Loans on Real Estate, Loan Category [Domain] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 54,000,000 |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 54,000,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 |  |  |  |
Pension Plan [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (183,000,000) |  | (156,000,000) |  |
Pension Plan [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 0 |  | 0 |  |
Pension Plan [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (183,000,000) |  | (156,000,000) |  |
Pension Plan [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 0 |  | 0 |  |
Pension Plan [Member] | Other Fixed Income [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (106,000,000) | [3] | (97,000,000) | [4] |
Pension Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 0 | [3] | 0 | [4] |
Pension Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels | (3,000,000) |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (105,000,000) | [3] | (93,000,000) | [4] |
Pension Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 5,000,000 |  | 9,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | (1,000,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 3,000,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (1,000,000) |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels | 1,000,000 |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (1,000,000) | [3] | (4,000,000) | [4] |
Pension Plan [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (54,000,000) |  |  |  |
Pension Plan [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 0 |  |  |  |
Pension Plan [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 0 |  |  |  |
Pension Plan [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (54,000,000) |  |  |  |
Pension Plan [Member] | Hedge Funds [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 620,000,000 |  | (743,000,000) |  |
Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 0 |  | 0 |  |
Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels | (105,000,000) |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 566,000,000 |  | (562,000,000) |  |
Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 54,000,000 |  | 181,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 2,000,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (24,000,000) |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 54,000,000 |  | (181,000,000) |  |
Pension Plan [Member] | Private Equity Funds [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 20,000,000 |  |  |  |
Pension Plan [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 0 |  |  |  |
Pension Plan [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 0 |  |  |  |
Pension Plan [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 20,000,000 |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 3,000,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 17,000,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | 20,000,000 |  |  |  |
Other Postretirement Benefit Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | $ (7,000,000) |  | $ (7,000,000) |  | $ (7,000,000)
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |  |
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Equity Securities | 25.00% |  | 25.00% |  |
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Debt Securities | 75.00% |  | 75.00% |  |
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Other | 0.00% |  | 0.00% |  |
Defined Benefit Plan Weighted Average Allocation Percentage of Assets | 100.00% |  | 100.00% |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | $ (171,000,000) | [5] | $ (200,000,000) | [6] |
Investment Payables Net of Investment Receivables | 10,000,000 |  | 5 |  |
Interest Receivables | 1,000,000 |  | 1 |  |
Defined Benefit Plan, Settlements, Benefit Obligation | 0 |  | 0 |  |
Other Postretirement Benefit Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (41,000,000) | [5] | (58,000,000) | [6] |
Other Postretirement Benefit Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (125,000,000) |  | (136,000,000) |  |
Other Postretirement Benefit Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (5,000,000) | [5] | (6,000,000) | [6] |
Other Postretirement Benefit Plan [Member] | Short-term Investments [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (16,000,000) |  | (13,000,000) |  |
Other Postretirement Benefit Plan [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value |  |  | (8,000,000) |  |
Other Postretirement Benefit Plan [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | $ (16,000,000) |  | (5,000,000) |  |
Other Postretirement Benefit Plan [Member] | Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 15.00% |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 45.00% |  |  |  |
Other Postretirement Benefit Plan [Member] | Equity Securities [Member] | Large Capitalization [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | $ (41,000,000) |  | (49,000,000) |  |
Other Postretirement Benefit Plan [Member] | Equity Securities [Member] | Large Capitalization [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (41,000,000) |  | (49,000,000) |  |
Other Postretirement Benefit Plan [Member] | Equity Securities [Member] | Large Capitalization [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | $ 0 |  | 0 |  |
Other Postretirement Benefit Plan [Member] | Fixed Income Funds [Member] |  |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 55.00% |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 85.00% |  |  |  |
Other Postretirement Benefit Plan [Member] | Alternative Assets [Member] |  |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 0.00% |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 0.00% |  |  |  |
Other Postretirement Benefit Plan [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | $ (38,000,000) |  | (44,000,000) |  |
Other Postretirement Benefit Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (36,000,000) |  | (41,000,000) |  |
Other Postretirement Benefit Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (2,000,000) |  | (3,000,000) |  |
Other Postretirement Benefit Plan [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (30,000,000) |  | (25,000,000) |  |
Other Postretirement Benefit Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (27,000,000) |  | (22,000,000) |  |
Other Postretirement Benefit Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (3,000,000) |  | (3,000,000) |  |
Other Postretirement Benefit Plan [Member] | US Treasury Securities [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (23,000,000) |  | (45,000,000) |  |
Other Postretirement Benefit Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value |  |  | (1,000,000) |  |
Other Postretirement Benefit Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (23,000,000) |  | (44,000,000) |  |
Other Postretirement Benefit Plan [Member] | Foreign Government Debt Securities [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (2,000,000) |  | (2,000,000) |  |
Other Postretirement Benefit Plan [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (2,000,000) |  | (2,000,000) |  |
Other Postretirement Benefit Plan [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (14,000,000) |  | (15,000,000) |  |
Other Postretirement Benefit Plan [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (14,000,000) |  | (15,000,000) |  |
Other Postretirement Benefit Plan [Member] | Other Fixed Income [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (7,000,000) |  | (7,000,000) |  |
Other Postretirement Benefit Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (7,000,000) |  | (7,000,000) |  |
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Large Capitalization [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (512,000,000) |  | (526,000,000) |  |
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Large Capitalization [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (500,000,000) |  | (526,000,000) |  |
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Large Capitalization [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (11,000,000) |  | 0 |  |
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Large Capitalization [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value | (1,000,000) |  | 0 |  |
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Mid Capitalization [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value |  |  | 0 |  |
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Mid Capitalization [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value |  |  | 0 |  |
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Mid Capitalization [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value |  |  | 0 |  |
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Mid Capitalization [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value |  |  | 0 |  |
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Small Capitalization [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value |  |  | 0 |  |
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Small Capitalization [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value |  |  | 0 |  |
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Small Capitalization [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value |  |  | 0 |  |
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Small Capitalization [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value |  |  | $ 0 |  |
Hartford Life Insurance Company [Member] | Separate Accounts [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Assets for Plan Benefits | $ 4,600,000,000 |  |  |  |
[1] | Excludes approximately $67 of investment payables net of investment receivables that are excluded from this disclosure requirement because they are trade receivables in the ordinary course of business where the carrying amount approximates fair value. Also excludes approximately $27 of interest receivable.
[2] | Excludes approximately $42 of investment payables net of investment receivables that are excluded from this disclosure requirement because they are trade receivables in the ordinary course of business where the carrying amount approximates fair value. Also excludes approximately $22 of interest receivable.
[3] | Includes ABS, municipal bonds, and foreign bonds.
[4] | Includes ABS and municipal bonds.
[5] | Excludes approximately $10 of investment payables net of investment receivables that are excluded from this disclosure requirement because they are trade receivables in the ordinary course of business where the carrying amount approximates fair value. Also excludes approximately $1 of interest receivable.
[6] | Excludes approximately $5 of investment payables net of investment receivables that are not carried at fair value and approximately $1 of interest receivable carried at fair value.

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