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v3.23.1

Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Less: Loss Reclassified into Income | $ (16) | $ (7) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 6 | 2 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (10) | (5) |
Cash Flow Hedges [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cash Flow Hedge, Pre-tax | (1) | (1) |
Cash Flow Hedge, Tax | 0 | 0 |
Cash Flow Hedge, After Tax | (1) | (1) |
Less: Loss Reclassified into Income | (1) |  | $ (5)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (1) | (1) | $ (3)
Pension and OPEB Plans [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax | (5) | 0 |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 2 | 0 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (3) | 0 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (3) | 0 |
Available-for-Sale Securities [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (10) | (6) |
Reclassification for Available for Sale Securities, Tax | 4 | 2 |
Reclassification for Available for Sale Securities, After-Tax | (6) | (4) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (6) | (4) |
Interest Expense [Member] | Cash Flow Hedges [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cash Flow Hedge, Pre-tax | (1) | (1) |
Cash Flow Hedge, Tax | 0 | 0 |
Cash Flow Hedge, After Tax | (1) | (1) |
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 |
Amortization of Prior Service (Cost) Credit, Tax | 0 | (1) |
Amortization of Prior Service (Cost) Credit, After-Tax | 2 | 4 |
Amortization of Actuarial Loss, Pre-Tax | (7) | (5) |
Amortization of Actuarial Loss, Tax | 2 | 1 |
Amortization of Actuarial Loss, After-Tax | (5) | (4) |
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 | (10) | (6) |
Reclassification for Available for Sale Securities, Tax | 4 | 2 |
Reclassification for Available for Sale Securities, After-Tax | $ (6) | $ (4) |

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Data Type: | na
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