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v3.23.3

Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Pension Lift Out Settlement Charge | $ (332) |  | $ (332) |  |
Pension Settlement Charge, tax | 93 |  | 93 |  |
Pension Lift Out Settlement Charge, net of tax | (239) |  | (239) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (338) | $ (15) | (365) | $ (36) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 95 | 5 | 105 | 13 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (243) | (10) | (260) | (23) |
Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Cash Flow Hedge, Pre-tax | 3 | (1) | 3 | (3) |
Cash Flow Hedge, Tax | 1 | 0 | 1 | (1) |
Cash Flow Hedge, After Tax | 2 | (1) | 2 | (2) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  | 3 |  | $ (5)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 2 | (1) | 2 | (2) | $ (3)
Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax | (333) | 0 | (343) | (1) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 93 | 0 | 96 | 0 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (240) | 0 | (247) | (1) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (240) | 0 | (247) | (1) |
Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (8) | (14) | (25) | (32) |
Reclassification for Available for Sale Securities, Tax | 3 | 5 | 10 | 12 |
Reclassification for Available for Sale Securities, After-Tax | (5) | (9) | (15) | (20) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (5) | (9) | (15) | (20) |
Interest Expense [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Cash Flow Hedge, Pre-tax | 3 | (1) | 3 | (3) |
Cash Flow Hedge, Tax | (1) | 0 | (1) | 1 |
Cash Flow Hedge, After Tax | 2 | 1 | 2 | (2) |
Non-Operating Pension and OPEB Credits (Costs) [Member] | Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 2 | 5 | 6 | 15 |
Amortization of Prior Service (Cost) Credit, Tax | (1) | (1) | (2) | (4) |
Amortization of Prior Service (Cost) Credit, After-Tax | 1 | 4 | 4 | 11 |
Amortization of Actuarial Loss, Pre-Tax | (3) | (5) | (17) | (16) |
Amortization of Actuarial Loss, Tax | 1 | 1 | 5 | 4 |
Amortization of Actuarial Loss, After-Tax | (2) | (4) | (12) | (12) |
Net Gains (Losses) on Trust Investments [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (8) | (14) | (25) | (32) |
Reclassification for Available for Sale Securities, Tax | 3 | 5 | 10 | 12 |
Reclassification for Available for Sale Securities, After-Tax | $ (5) | $ (9) | $ (15) | $ (20) |

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