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Employee Benefit Plans Level 4 Defined Benefit Plan, Information about Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases $ 1,767 $ 1,493  
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation 5,650 5,734  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 4,422 3,911 $ 4,146
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (171) (66)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 695 486  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (390) (648)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 24 (93)  
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 5,650 5,732  
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets 4,678 4,430  
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 320 375  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 201 139 112
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (1) 28  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 15 20  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (78) (238)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (3) 5  
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels   (14)  
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   12  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   19 34
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, Settlements 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (11)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   (2)  
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels   (6)  
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   14  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   24 28
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, Settlements 14 14  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (2)  
Defined Benefit Plan, Transfers Between Measurement Levels   4  
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   1  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   5 5
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, Settlements 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   (1)  
Mortgage Loans on Real Estate, Loan Category [Domain] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 0  
Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 1 3  
Other Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels 0    
Other Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 1 1  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1 2 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 1 (1)  
Defined Benefit Plan, Transfers Between Measurement Levels 1 (1)  
Other Pension Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels 0    
Other Pension Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 1  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1 3 3
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, Settlements (2) 1  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0    
Defined Benefit Plan, Transfers Between Measurement Levels 0    
Other Pension Plan [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels 0    
Other Pension Plan [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0    
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0 0 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, Settlements 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0    
Defined Benefit Plan, Transfers Between Measurement Levels 0    
Other Pension Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels 0    
Other Pension Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 1 0  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0  
Defined Benefit Plan, Transfers Between Measurement Levels 0    
Other Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels 0    
Other Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 2 2  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 3 5 6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (2) 1  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 1 (1)  
Defined Benefit Plan, Transfers Between Measurement Levels 1 (1)  
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assets for Plan Benefits [1] $ 4,641 $ 4,470  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Equity Securities 24.00% 23.00%  
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Debt Securities 76.00% 77.00%  
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 $ 4,214 $ 3,830  
Investment Payables Net of Investment Receivables 2 67  
Interest Receivables 39 27  
Defined Benefit Plan, Settlements, Benefit Obligation 0 0  
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 [1] 993 821  
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels (14) 23  
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] 3,054 2,902  
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 109 84  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 167 107 76
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 1 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   (17)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (23) 14  
Defined Benefit Plan, Transfers Between Measurement Levels 5 (5)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (3) (4)  
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] 167 107  
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 311 281  
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 12 7  
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 299 274  
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 10.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 30.00%    
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 $ 300 385  
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 300 298  
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 0 87  
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 0.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 40.00%    
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 $ 1,482 941  
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]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels (11)    
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 1,469 922  
Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 15    
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 13 19  
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, Sales (10)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 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 13 19  
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 276 266  
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]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels (2)    
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 266 242  
Pension Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0    
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 10 24  
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, Sales 0    
Defined Benefit Plan, Transfers Between Measurement Levels 2    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 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 10 24  
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 722 1,048  
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 69 16  
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 649 1,029  
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 4 3  
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 38 54  
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 37 49  
Pension Plan [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0    
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1 5  
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, Sales (4)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 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 1 5  
Pension Plan [Member] | Mortgage Loans on Real Estate, Loan Category [Domain] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 70 54  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 121 54 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (3) 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 114 [2] 106 [3]  
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 [2] 0 [3]  
Pension Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels (1) (3)  
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 96 [2] 105 [3]  
Pension Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 24 3  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 22 5 $ 9
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 1 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (9) (1)  
Defined Benefit Plan, Transfers Between Measurement Levels 3 1  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 (1)  
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 18 [2] 1 [3]  
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 340 620  
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]      
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 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] | 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 131 183  
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 131 183  
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] | 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 121 54  
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 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 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 121 54  
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 87 20  
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 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 0  
Pension Plan [Member] | Private Equity Funds [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  
Other Postretirement Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) $ (7)    
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Equity Securities 27.00% 25.00%  
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Debt Securities 73.00% 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 $ 137 [4] $ 171 [5]  
Investment Payables Net of Investment Receivables 1 5  
Interest Receivables 1 1  
Defined Benefit Plan, Settlements, Benefit Obligation 1 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 46 [4] 41 [5]  
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 88 125  
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 3 [4] 5 [5]  
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 4 16  
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 4    
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 $ 0 16  
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 $ 37 41  
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 37 41  
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 $ 36 38  
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 35 36  
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 1 2  
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 25 30  
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 24 27  
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 1 3  
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 19 23  
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 5    
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 14 23  
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 2  
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 2  
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 5 7  
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 4 7  
Other Postretirement Benefit Plan [Member] | Other Fixed Income [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    
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 9 14  
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 9 14  
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 696 512  
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 589 500  
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 107 11  
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 0 $ 1  
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 23    
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 23    
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    
Hartford Life Insurance Company [Member] | Separate Accounts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assets for Plan Benefits $ 4,800    
[1] Excludes approximately $2 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 $39 of interest receivable
[2] Includes ABS, municipal bonds, and CDOs.
[3] Includes ABS,municipal bonds, and CDOs.
[4] Excludes approximately $1 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.
[5] 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.