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Accumulated Other Comprehensive Loss - Reclassification Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Interest expense - Borrowed funds | $ 754 | $ 889
Income tax (expense) | (21) | (54)
Net income (loss) | (100) | (327)
General and administrative | 147 | 186
Reclassification from AOCI |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net income (loss) | 6 | 16
Reclassification from AOCI | Cash Flow Hedges |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Interest expense - Borrowed funds | 9 | 23
Income tax (expense) | (2) | (6)
Net income (loss) | 7 | 17
Reclassification from AOCI | Pension and Post-retirement Plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net income (loss) | (1) | (1)
Reclassification from AOCI | Amortization of actuarial losses |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Income tax (expense) | 0 | 0
General and administrative | $ (1) | $ (1)

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