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Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications out of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Pre-Tax Amount |  |  | $ (307) | $ (49) | $ (15)
Tax (Expense) Benefit |  |  | 82 | (19) | (4)
After-Tax Amount |  |  | (225) | (30) | (11)
Pension Lift Out Settlement Charge | $ (6) | $ (332) | (334) |  |
Pension Settlement Charge, tax |  |  | 94 |  |
Pension Lift Out Settlement Charge, net of tax | $ (4) | $ (239) | (240) |  |
Cash Flow Hedges |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Pre-Tax Amount |  |  | 5 | (5) | (4)
Tax (Expense) Benefit |  |  | (2) | (2) | (1)
After-Tax Amount |  |  | 3 | (3) | (3)
Pension and OPEB Plans |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Pre-Tax Amount |  |  | (346) | (1) | (20)
Tax (Expense) Benefit |  |  | 98 | 0 | (6)
After-Tax Amount |  |  | (248) | (1) | (14)
Available-for-Sale Securities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Pre-Tax Amount |  |  | 34 | (43) | 9
Tax (Expense) Benefit |  |  | (14) | (17) | 3
After-Tax Amount |  |  | 20 | (26) | 6
Interest Expense | Cash Flow Hedges |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Pre-Tax Amount |  |  | 5 | (5) | (4)
Tax (Expense) Benefit |  |  | (2) | (2) | (1)
After-Tax Amount |  |  | 3 | (3) | (3)
Amortization of Prior Service (Cost) Credit | Pension and OPEB Plans |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Pre-Tax Amount |  |  | 8 | (21) | (21)
Tax (Expense) Benefit |  |  | (2) | (6) | (6)
After-Tax Amount |  |  | 6 | (15) | (15)
Amortization of Actuarial Loss | Pension and OPEB Plans |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Pre-Tax Amount |  |  | (20) | 22 | 41
Tax (Expense) Benefit |  |  | 6 | 6 | 12
After-Tax Amount |  |  | (14) | 16 | 29
Net Gains (Losses) on Trust Investments | Available-for-Sale Securities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Pre-Tax Amount |  |  | 34 | (43) | 9
Tax (Expense) Benefit |  |  | (14) | (17) | 3
After-Tax Amount |  |  | $ 20 | $ (26) | $ 6

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