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Employee Benefit Plans - Defined Benefit Plan, Information about Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
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 | 4,363 | 3,914
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 4,363 | 3,914
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 4,482 | 4,363
Defined Benefit Plan, Fair Value of Plan Assets, Excluded Investment Payables | 51 | 20
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 | 859 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 859 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 501 | 859
Pension Plan [Member] | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2,599 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2,599 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 2,908 | 2,599
Pension Plan [Member] | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 210 | 160
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 210 | 160
Realized gains (losses), net | (3) | (1)
Changes in unrealized gains, net | 0 | 6
Purchases | 66 | 56
Sales | (23) | (9)
Transfers into Level 3 | 2 | 0
Transfers out of Level 3 | (1) | (2)
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 251 | 210
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 | 4,343 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 4,343 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | $ 4,431 | 4,343
Pension Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 27.00% |
Pension Plan [Member] | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 73.00% |
Pension Plan [Member] | Short-term Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | $ 100 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 100 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 149 | 100
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 | 75 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 75 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 120 | 75
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 | 25 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 25 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 29 | 25
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 | 2,342 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2,342 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 2,375 | 2,342
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 | 2,303 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2,303 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 2,333 | 2,303
Pension Plan [Member] | Corporate | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 39 | 27
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 39 | 27
Realized gains (losses), net | 0 | 0
Changes in unrealized gains, net | 0 | 1
Purchases | 6 | 14
Sales | (5) | (3)
Transfers into Level 3 | 2 | 0
Transfers out of Level 3 |  | 0
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 42 | 39
Pension Plan [Member] | Residential mortgage-backed securities ("RMBS") |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 42 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 42 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 98 | 42
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 | 41 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 41 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 98 | 41
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 | 1 | 0
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 1 | 0
Realized gains (losses), net | 0 | 0
Changes in unrealized gains, net | 0 | 0
Purchases | 0 | 1
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (1) | 0
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 1
Pension Plan [Member] | U.S. Treasuries |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 47 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 47 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 192 | 47
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 | 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 | 23 | 0
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 | 47 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 47 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 169 | 47
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 | 25 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 25 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 40 | 25
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 | 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 | 38 | 16
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 | 9 | 1
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 9 | 1
Realized gains (losses), net | 0 | 0
Changes in unrealized gains, net | 0 | 0
Purchases | 0 | 9
Sales | (7) | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (1)
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 2 | 9
Pension Plan [Member] | CMBS |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 30 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 30 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 60 | 30
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 | 30 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 30 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 56 | 30
Pension 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 | 4 | 0
Pension Plan [Member] | Other Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 137 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 137 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 186 | 137
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 | 137 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 137 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 185 | 137
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 | 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 | 1 | 0
Pension Plan [Member] | Mortgage loans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 161 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 161 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 202 | 161
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 | 161 | 131
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 161 | 131
Realized gains (losses), net | (3) | 0
Changes in unrealized gains, net | 0 | 4
Purchases | 55 | 32
Sales | (11) | (6)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 202 | 161
Pension Plan [Member] | Domestic |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 513 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 513 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 237 | 513
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 | 513 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 513 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 237 | 513
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 | 271 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 271 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 121 | 271
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 | 271 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 271 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 121 | 271
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 | 0 | 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 | 3,668 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 3,668 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 3,660 | 3,668
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 | 859 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 859 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 501 | 859
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 | 2,599 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2,599 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 2,908 | 2,599
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 | 210 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 210 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 251 | 210
Pension Plan [Member] | Private Market Alternatives |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 451 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 451 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 572 | 451
Pension Plan [Member] | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 224 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 224 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 199 | 224
Pension Plan [Member] | Other investments | 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 (losses), net | 0 | (1)
Changes in unrealized gains, net | 0 | 1
Purchases | 5 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 |  | (1)
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 5 | 0
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 | 63 | 75
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 63 | 75
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 51 | 63
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 | 19 | 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 | 44 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 44 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 32 | 44
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 | 30.00% |
Other Postretirement Benefits Plan [Member] | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 70.00% |
Other Postretirement Benefits Plan [Member] | Short-term Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | $ 2 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 1 | 2
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 | 2 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 1 | 2
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 | 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 | 11 | 16
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 | 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 | 11 | 16
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 | 9 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 9 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 7 | 9
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 | 9 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 9 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 7 | 9
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 | 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 | 14 | 16
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 | 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 | 1 | 0
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 | 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 | 13 | 16
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 | 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 | 1 | 0
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 | 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 | 1 | 0
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 | 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 | 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] | 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 | 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] | 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 | 2 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 1 | 2
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 | 2 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 2 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 1 | 2
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 | 17 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 17 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 16 | 17
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 | 17 |
Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 17 |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 16 | 17
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 | 3.00% |
Minimum | Pension Plan [Member] | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 69.00% |
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 | 55.00% |
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 | 23.00% |
Maximum | Pension Plan [Member] | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 77.00% |
Maximum | Pension Plan [Member] | Alternative assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 28.00% |
Maximum | Other Postretirement Benefits Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 45.00% |
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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