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Employee Benefit Plans - Defined Benefit Plan, Information about Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Settlements | $ (6) | $ (15) |  |
Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 40.00% |
Fixed income securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 60.00% |
Corporate | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Settlements | 0 | 0 |  |
RMBS | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Settlements | (5) | (14) |  |
Foreign government | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Settlements | 0 | 0 |  |
Mortgage loans | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Settlements | 0 | 0 |  |
Other investments | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Settlements | (1) | (1) |  |
Pension Benefits |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 4,641 |  |  |
Fair value of plan assets - end of year | 3,563 | 4,641 |  |
Plan assets at fair value | 4,641 | 4,641 | $ 3,563 | $ 4,641
Excluded investment payables |  |  | 1 | 2
Excluded investment receivables |  |  | 30 | 39
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 993 |  |  |
Fair value of plan assets - end of year | 973 | 993 |  |
Plan assets at fair value | 993 | 993 | 973 | 993
Pension Benefits | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 3,054 |  |  |
Fair value of plan assets - end of year | 2,049 | 3,054 |  |
Plan assets at fair value | 3,054 | 3,054 | 2,049 | 3,054
Pension Benefits | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 167 | 107 |  |
Realized gains,net | 2 | 1 |  |
Changes in unrealized gains, net | 6 | (3) |  |
Purchases | 36 | 109 |  |
Sales | (35) | (23) |  |
Transfers into Level 3 | 2 | 5 |  |
Transfers out of Level 3 | (11) | (14) |  |
Fair value of plan assets - end of year | 161 | 167 |  |
Plan assets at fair value | 167 | 107 | $ 161 | 167
Pension Benefits | Equity securities | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 35.00% |
Pension Benefits | Equity securities | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 5.00% |
Pension Benefits | Fixed income securities | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 70.00% |
Pension Benefits | Fixed income securities | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 50.00% |
Pension Benefits | Alternative assets | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 45.00% |
Pension Benefits | Alternative assets | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 0.00% |
Pension Benefits | Short-term investments |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | $ 189 | 311
Pension Benefits | Short-term investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 21 | 12
Pension Benefits | Short-term investments | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 168 | 299
Pension Benefits | Short-term investments | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 0
Pension Benefits | Corporate |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 1,563 | 1,482
Pension Benefits | Corporate | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 0
Pension Benefits | Corporate | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 1,549 | 1,469
Pension Benefits | Corporate | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 13 | 19 |  |
Realized gains,net | 0 | 0 |  |
Changes in unrealized gains, net | 2 | 0 |  |
Purchases | 11 | 15 |  |
Sales | (12) | (10) |  |
Transfers into Level 3 | 0 | 0 |  |
Transfers out of Level 3 |  | (11) |  |
Fair value of plan assets - end of year | 14 | 13 |  |
Plan assets at fair value in the fair value hierarchy |  |  | 14 | 13
Plan assets at fair value | 13 | 19 | 14 | 13
Pension Benefits | RMBS |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 30 | 276
Pension Benefits | RMBS | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 0
Pension Benefits | RMBS | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 28 | 266
Pension Benefits | RMBS | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 10 | 24 |  |
Realized gains,net | 0 | 0 |  |
Changes in unrealized gains, net | 0 | 0 |  |
Purchases | 1 | 0 |  |
Sales | (4) | 0 |  |
Transfers into Level 3 | 0 | 2 |  |
Transfers out of Level 3 | 0 | (2) |  |
Fair value of plan assets - end of year | 2 | 10 |  |
Plan assets at fair value in the fair value hierarchy |  |  | 2 | 10
Plan assets at fair value | 10 | 24 | 2 | 10
Pension Benefits | U.S. Treasuries |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 77 | 722
Pension Benefits | U.S. Treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 3 | 69
Pension Benefits | U.S. Treasuries | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 74 | 649
Pension Benefits | U.S. Treasuries | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 4
Pension Benefits | Foreign government |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 17 | 38
Pension Benefits | Foreign government | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 0
Pension Benefits | Foreign government | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 16 | 37
Pension Benefits | Foreign government | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 1 | 5 |  |
Realized gains,net | 0 | 0 |  |
Changes in unrealized gains, net | 0 | 0 |  |
Purchases | 0 | 0 |  |
Sales | 0 | (4) |  |
Transfers into Level 3 | 0 | 0 |  |
Transfers out of Level 3 | 0 |  |  |
Fair value of plan assets - end of year | 1 | 1 |  |
Plan assets at fair value in the fair value hierarchy |  |  | 1 | 1
Plan assets at fair value | 1 | 5 | 1 | 1
Pension Benefits | CMBS |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 30 | 131
Pension Benefits | CMBS | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 0
Pension Benefits | CMBS | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 28 | 131
Pension Benefits | CMBS | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 2 | 0
Pension Benefits | Other fixed income |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 99 | 114
Pension Benefits | Other fixed income | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 0
Pension Benefits | Other fixed income | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 97 | 96
Pension Benefits | Other fixed income | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 2 | 18
Pension Benefits | Mortgage loans |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 140 | 121
Pension Benefits | Mortgage loans | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 0
Pension Benefits | Mortgage loans | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 0
Pension Benefits | Mortgage loans | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 121 | 54 |  |
Realized gains,net | 0 | 0 |  |
Changes in unrealized gains, net | 2 | (3) |  |
Purchases | 17 | 70 |  |
Sales | 0 | 0 |  |
Transfers into Level 3 | 0 | 0 |  |
Transfers out of Level 3 | 0 |  |  |
Fair value of plan assets - end of year | 140 | 121 |  |
Plan assets at fair value in the fair value hierarchy |  |  | 140 | 121
Plan assets at fair value | 121 | 54 | 140 | 121
Pension Benefits | Other investments | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 22 | 5 |  |
Realized gains,net | 2 | 1 |  |
Changes in unrealized gains, net | 2 | 0 |  |
Purchases | 7 | 24 |  |
Sales | (19) | (9) |  |
Transfers into Level 3 | 2 | 3 |  |
Transfers out of Level 3 | (11) | (1) |  |
Fair value of plan assets - end of year | 4 | 22 |  |
Plan assets at fair value | 22 | 5 | 4 | 22
Pension Benefits | Large-cap domestic |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 684 | 696
Pension Benefits | Large-cap domestic | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 595 | 589
Pension Benefits | Large-cap domestic | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 89 | 107
Pension Benefits | Large-cap domestic | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 0
Pension Benefits | Mid-cap domestic |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 11 | 23
Pension Benefits | Mid-cap domestic | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 11 | 23
Pension Benefits | Mid-cap domestic | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 0
Pension Benefits | Mid-cap domestic | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 0
Pension Benefits | International |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 343 | 300
Pension Benefits | International | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 343 | 300
Pension Benefits | International | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 0
Pension Benefits | International | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 0 | 0
Pension Benefits | Total pension plan assets at fair value, in the fair value hierarchy |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 3,183 | 4,214
Pension Benefits | Total pension plan assets at fair value, in the fair value hierarchy | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 973 | 993
Pension Benefits | Total pension plan assets at fair value, in the fair value hierarchy | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 2,049 | 3,054
Pension Benefits | Total pension plan assets at fair value, in the fair value hierarchy | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at fair value in the fair value hierarchy |  |  | 161 | 167
Pension Benefits | Private Market Alternatives |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at net asset value |  |  | 168 | 87
Pension Benefits | Private Market Alternatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at net asset value |  |  | 0 | 0
Pension Benefits | Private Market Alternatives | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at net asset value |  |  | 0 | 0
Pension Benefits | Private Market Alternatives | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at net asset value |  |  | 0 | 0
Pension Benefits | Hedge funds |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at net asset value |  |  | 212 | 340
Pension Benefits | Hedge funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at net asset value |  |  | 0 | 0
Pension Benefits | Hedge funds | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at net asset value |  |  | 0 | 0
Pension Benefits | Hedge funds | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Plan assets at net asset value |  |  | 0 | 0
Other Postretirement Benefits |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 137 |  |  |
Fair value of plan assets - end of year | 113 | 137 |  |
Plan assets at fair value | 137 | 137 | 113 | 137
Excluded investment payables |  |  | 0 |
Excluded investment receivables |  |  | 1 | 1
Other Postretirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 46 |  |  |
Fair value of plan assets - end of year | 35 | 46 |  |
Plan assets at fair value | 46 | 46 | 35 | 46
Other Postretirement Benefits | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 88 |  |  |
Fair value of plan assets - end of year | 77 | 88 |  |
Plan assets at fair value | 88 | 88 | 77 | 88
Other Postretirement Benefits | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 3 | 5 |  |
Changes in unrealized gains, net | 0 | 0 |  |
Purchases | 2 | 2 |  |
Settlements | (1) | (2) |  |
Sales | (2) | (1) |  |
Transfers into Level 3 |  | 0 |  |
Transfers out of Level 3 | (1) | (1) |  |
Fair value of plan assets - end of year | 1 | 3 |  |
Plan assets at fair value | 3 | 5 | $ 1 | 3
Other Postretirement Benefits | Equity securities | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 45.00% |
Other Postretirement Benefits | Equity securities | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 15.00% |
Other Postretirement Benefits | Fixed income securities | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 85.00% |
Other Postretirement Benefits | Fixed income securities | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 55.00% |
Other Postretirement Benefits | Alternative assets | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 0.00% |
Other Postretirement Benefits | Alternative assets | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target asset allocation |  |  | 0.00% |
Other Postretirement Benefits | Short-term investments |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 4 |  |  |
Fair value of plan assets - end of year | 4 | 4 |  |
Plan assets at fair value | 4 | 4 | $ 4 | 4
Other Postretirement Benefits | Short-term investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 4 |  |  |
Fair value of plan assets - end of year | 4 | 4 |  |
Plan assets at fair value | 4 | 4 | 4 | 4
Other Postretirement Benefits | Short-term investments | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 0 |  |  |
Fair value of plan assets - end of year | 0 | 0 |  |
Plan assets at fair value | 0 | 0 | 0 | 0
Other Postretirement Benefits | Corporate |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 36 |  |  |
Fair value of plan assets - end of year | 25 | 36 |  |
Plan assets at fair value | 36 | 36 | 25 | 36
Other Postretirement Benefits | Corporate | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 35 |  |  |
Fair value of plan assets - end of year | 25 | 35 |  |
Plan assets at fair value | 35 | 35 | 25 | 35
Other Postretirement Benefits | Corporate | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 1 | 2 |  |
Changes in unrealized gains, net | 0 | 0 |  |
Purchases | 1 | 1 |  |
Settlements | 0 | 0 |  |
Sales | (2) | (1) |  |
Transfers into Level 3 |  | 0 |  |
Transfers out of Level 3 | 0 | (1) |  |
Fair value of plan assets - end of year | 0 | 1 |  |
Plan assets at fair value | 1 | 2 | 0 | 1
Other Postretirement Benefits | RMBS |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 25 |  |  |
Fair value of plan assets - end of year | 17 | 25 |  |
Plan assets at fair value | 25 | 25 | 17 | 25
Other Postretirement Benefits | RMBS | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 24 |  |  |
Fair value of plan assets - end of year | 17 | 24 |  |
Plan assets at fair value | 24 | 24 | 17 | 24
Other Postretirement Benefits | RMBS | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 1 | 3 |  |
Settlements | (1) | (2) |  |
Sales | 0 |  |  |
Transfers into Level 3 |  | 0 |  |
Transfers out of Level 3 | 0 |  |  |
Fair value of plan assets - end of year | 0 | 1 |  |
Plan assets at fair value | 1 | 3 | 0 | 1
Other Postretirement Benefits | U.S. Treasuries |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 19 |  |  |
Fair value of plan assets - end of year | 26 | 19 |  |
Plan assets at fair value | 19 | 19 | 26 | 19
Other Postretirement Benefits | U.S. Treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 5 |  |  |
Fair value of plan assets - end of year | 1 | 5 |  |
Plan assets at fair value | 5 | 5 | 1 | 5
Other Postretirement Benefits | U.S. Treasuries | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 14 |  |  |
Fair value of plan assets - end of year | 25 | 14 |  |
Plan assets at fair value | 14 | 14 | 25 | 14
Other Postretirement Benefits | Foreign government |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 2 |  |  |
Fair value of plan assets - end of year | 1 | 2 |  |
Plan assets at fair value | 2 | 2 | 1 | 2
Other Postretirement Benefits | Foreign government | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 2 |  |  |
Fair value of plan assets - end of year | 1 | 2 |  |
Plan assets at fair value | 2 | 2 | 1 | 2
Other Postretirement Benefits | Foreign government | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 0 | 0 |  |
Sales | 0 |  |  |
Transfers into Level 3 |  | 0 |  |
Transfers out of Level 3 | 0 |  |  |
Fair value of plan assets - end of year | 0 | 0 |  |
Plan assets at fair value | 0 | 0 | 0 | 0
Other Postretirement Benefits | CMBS |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 9 |  |  |
Fair value of plan assets - end of year | 5 | 9 |  |
Plan assets at fair value | 9 | 9 | 5 | 9
Other Postretirement Benefits | CMBS | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 9 |  |  |
Fair value of plan assets - end of year | 5 | 9 |  |
Plan assets at fair value | 9 | 9 | 5 | 9
Other Postretirement Benefits | Other fixed income |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 5 |  |  |
Fair value of plan assets - end of year | 5 | 5 |  |
Plan assets at fair value | 5 | 5 | 5 | 5
Other Postretirement Benefits | Other fixed income | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 4 |  |  |
Fair value of plan assets - end of year | 4 | 4 |  |
Plan assets at fair value | 4 | 4 | 4 | 4
Other Postretirement Benefits | Other fixed income | Significant Unobservable Inputs (Level 3) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 1 | 0 |  |
Changes in unrealized gains, net | 0 | 0 |  |
Purchases | 1 | 1 |  |
Settlements | 0 |  |  |
Sales | 0 | 0 |  |
Transfers into Level 3 |  | 0 |  |
Transfers out of Level 3 | (1) |  |  |
Fair value of plan assets - end of year | 1 | 1 |  |
Plan assets at fair value | 1 | 0 | 1 | 1
Other Postretirement Benefits | Large-cap |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 37 |  |  |
Fair value of plan assets - end of year | 30 | 37 |  |
Plan assets at fair value | 37 | 37 | 30 | 37
Other Postretirement Benefits | Large-cap | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 37 |  |  |
Fair value of plan assets - end of year | 30 | 37 |  |
Plan assets at fair value | 37 | 37 | 30 | 37
Other Postretirement Benefits | Large-cap | Significant Observable Inputs (Level 2) |  |  |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of plan assets - beginning of year | 0 |  |  |
Fair value of plan assets - end of year | 0 | 0 |  |
Plan assets at fair value | $ 0 | $ 0 | $ 0 | $ 0

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