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Employee Benefit Plans - Defined Benefit Plan, Information about Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Significant Unobservable Inputs (Level 3) |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Settlements | $ 0 | $ 0
Corporate | Significant Unobservable Inputs (Level 3) |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Settlements | 0 | 0
Residential mortgage-backed securities ("RMBS") | Significant Unobservable Inputs (Level 3) |  |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Settlements | 0 | 0
Foreign government/government agencies | 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 | 0 | 0
Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 4,482 | 4,363
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 4,482 | 4,363
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 3,524 | 4,482
Defined Benefit Plan, Fair Value of Plan Assets, Excluded Investment Payables | 46 | 51
Pension Plan [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 501 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 501 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 163 | 501
Pension Plan [Member] | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2,908 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2,908 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 2,299 | 2,908
Pension Plan [Member] | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 251 | 210
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 251 | 210
Realized gains, net | 0 | (3)
Changes in unrealized gains (losses), net | (35) | 0
Purchases | 5 | 66
Sales | (18) | (23)
Transfers into Level 3 | 3 | 2
Transfers out of Level 3 | (8) | (1)
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 198 | 251
Pension Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 4,431 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 4,431 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | $ 3,478 | $ 4,431
Pension Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 27.00% | 35.00%
Pension Plan [Member] | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 73.00% | 65.00%
Pension Plan [Member] | Short-term Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | $ 149 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 149 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 155 | $ 149
Pension Plan [Member] | Short-term Investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 120 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 120 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 155 | 120
Pension Plan [Member] | Short-term Investments [Member] | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 29 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 29 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 29
Pension Plan [Member] | Short-term Investments [Member] | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Pension Plan [Member] | Corporate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2,375 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2,375 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 1,822 | 2,375
Pension Plan [Member] | Corporate | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Pension Plan [Member] | Corporate | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2,333 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2,333 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 1,791 | 2,333
Pension Plan [Member] | Corporate | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 42 | 39
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 42 | 39
Realized gains, net | 0 | 0
Changes in unrealized gains (losses), net | (10) | 0
Purchases | 1 | 6
Sales | (2) | (5)
Transfers into Level 3 | 3 | 2
Transfers out of Level 3 | (3) | 0
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 31 | 42
Pension Plan [Member] | Residential mortgage-backed securities ("RMBS") |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 98 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 98 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 115 | 98
Pension Plan [Member] | Residential mortgage-backed securities ("RMBS") | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Pension Plan [Member] | Residential mortgage-backed securities ("RMBS") | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 98 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 98 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 115 | 98
Pension Plan [Member] | Residential mortgage-backed securities ("RMBS") | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 | 1
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 | 1
Realized gains, net | 0 | 0
Changes in unrealized gains (losses), net | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (1)
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Pension Plan [Member] | U.S. Treasuries |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 192 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 192 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 165 | 192
Pension Plan [Member] | U.S. Treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 23 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 23 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 23
Pension Plan [Member] | U.S. Treasuries | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 169 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 169 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 165 | 169
Pension Plan [Member] | U.S. Treasuries | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Pension Plan [Member] | Foreign government/government agencies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 40 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 40 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 26 | 40
Pension Plan [Member] | Foreign government/government agencies | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Pension Plan [Member] | Foreign government/government agencies | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 38 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 38 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 25 | 38
Pension Plan [Member] | Foreign government/government agencies | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2 | 9
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2 | 9
Realized gains, net | 0 | 0
Changes in unrealized gains (losses), net | 0 | 0
Purchases | 0 | 0
Sales | 0 | (7)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (1) | 0
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 1 | 2
Pension Plan [Member] | CMBS |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 60 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 60 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 58 | 60
Pension Plan [Member] | CMBS | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Pension Plan [Member] | CMBS | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 56 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 56 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 57 | 56
Pension Plan [Member] | CMBS | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 4 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 4 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 1 | 4
Pension Plan [Member] | Other Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 186 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 186 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 139 | 186
Pension Plan [Member] | Other Fixed Income [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Pension Plan [Member] | Other Fixed Income [Member] | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 185 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 185 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 139 | 185
Pension Plan [Member] | Other Fixed Income [Member] | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 1
Pension Plan [Member] | Mortgage loans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 202 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 202 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 165 | 202
Pension Plan [Member] | Mortgage loans | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Pension Plan [Member] | Mortgage loans | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Pension Plan [Member] | Mortgage loans | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 202 | 161
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 202 | 161
Realized gains, net | 0 | (3)
Changes in unrealized gains (losses), net | (25) | 0
Purchases | 4 | 55
Sales | (16) | (11)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 165 | 202
Pension Plan [Member] | Domestic |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 237 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 237 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 8 | 237
Pension Plan [Member] | Domestic | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 237 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 237 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 8 | 237
Pension Plan [Member] | Domestic | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Pension Plan [Member] | Domestic | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Pension Plan [Member] | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 121 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 121 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 7 | 121
Pension Plan [Member] | International | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 121 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 121 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 121
Pension Plan [Member] | International | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 7 | 0
Pension Plan [Member] | International | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Pension Plan [Member] | Total pension plan assets at fair value, in the fair value hierarchy |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 3,660 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 3,660 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 2,660 | 3,660
Pension Plan [Member] | Total pension plan assets at fair value, in the fair value hierarchy | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 501 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 501 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 163 | 501
Pension Plan [Member] | Total pension plan assets at fair value, in the fair value hierarchy | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2,908 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2,908 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 2,299 | 2,908
Pension Plan [Member] | Total pension plan assets at fair value, in the fair value hierarchy | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 251 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 251 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 198 | 251
Pension Plan [Member] | Private Market Alternatives |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 572 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 572 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 666 | 572
Pension Plan [Member] | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 199 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 199 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 152 | 199
Pension Plan [Member] | Other investments | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 5 | 0
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 5 | 0
Realized gains, net | 0 | 0
Changes in unrealized gains (losses), net | 0 | 0
Purchases | 0 | 5
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (4) | 0
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 1 | 5
Pension Plan [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 1 | 1
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 51 | 63
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 51 | 63
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 30 | 51
Other Postretirement Benefits Plan [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 19 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 19 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 25 | 19
Other Postretirement Benefits Plan [Member] | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 32 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 32 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 5 | 32
Other Postretirement Benefits Plan [Member] | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | $ 0 | $ 0
Other Postretirement Benefits Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 25.00% | 25.00%
Other Postretirement Benefits Plan [Member] | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 75.00% | 75.00%
Other Postretirement Benefits Plan [Member] | Short-term Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | $ 1 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 25 | $ 1
Other Postretirement Benefits Plan [Member] | Short-term Investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 25 | 1
Other Postretirement Benefits Plan [Member] | Short-term Investments [Member] | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | Short-term Investments [Member] | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | Corporate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 11 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 11 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 11
Other Postretirement Benefits Plan [Member] | Corporate | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | Corporate | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 11 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 11 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 11
Other Postretirement Benefits Plan [Member] | Corporate | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | Residential mortgage-backed securities ("RMBS") |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 7 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 7 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 1 | 7
Other Postretirement Benefits Plan [Member] | Residential mortgage-backed securities ("RMBS") | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | Residential mortgage-backed securities ("RMBS") | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 7 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 7 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 1 | 7
Other Postretirement Benefits Plan [Member] | Residential mortgage-backed securities ("RMBS") | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | U.S. Treasuries |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 14 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 14 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 4 | 14
Other Postretirement Benefits Plan [Member] | U.S. Treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 1
Other Postretirement Benefits Plan [Member] | U.S. Treasuries | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 13 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 13 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 4 | 13
Other Postretirement Benefits Plan [Member] | U.S. Treasuries | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | Foreign government/government agencies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 1
Other Postretirement Benefits Plan [Member] | Foreign government/government agencies | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 1
Other Postretirement Benefits Plan [Member] | Foreign government/government agencies | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance |  | 0
Other Postretirement Benefits Plan [Member] | Foreign government/government agencies | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | CMBS |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | CMBS | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | CMBS | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | CMBS | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | Other Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 1
Other Postretirement Benefits Plan [Member] | Other Fixed Income [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | Other Fixed Income [Member] | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 1
Other Postretirement Benefits Plan [Member] | Other Fixed Income [Member] | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | Large-cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 16 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 16 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 16
Other Postretirement Benefits Plan [Member] | Large-cap | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 16 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 16 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 16
Other Postretirement Benefits Plan [Member] | Large-cap | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | Large-cap | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0
Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 0 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | $ 0 | $ 0
Minimum | Pension Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 0.00% |
Minimum | Pension Plan [Member] | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 75.00% |
Minimum | Pension Plan [Member] | Alternative assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 0.00% |
Minimum | Other Postretirement Benefits Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 0.00% |
Minimum | Other Postretirement Benefits Plan [Member] | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 100.00% |
Minimum | Other Postretirement Benefits Plan [Member] | Alternative assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 0.00% |
Maximum | Pension Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 20.00% |
Maximum | Pension Plan [Member] | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 95.00% |
Maximum | Pension Plan [Member] | Alternative assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 25.00% |
Maximum | Other Postretirement Benefits Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 0.00% |
Maximum | Other Postretirement Benefits Plan [Member] | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 100.00% |
Maximum | Other Postretirement Benefits Plan [Member] | Alternative assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 0.00% |

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