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Accumulated Other Comprehensive Loss - Reclassification Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest expense - Borrowed funds $ 676 $ 1,024 $ 2,154 $ 2,904
Income tax (benefit) 5 55 37 210
General and administrative 153 188 433 557
Net (loss) (36) (280) (206) (930)
Reclassification from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net (loss) 3 13 14 40
Reclassification from AOCI | Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest expense - Borrowed funds 6 18 22 57
Income tax (benefit) (2) (5) (6) (15)
Net (loss) 4 13 16 42
Reclassification from AOCI | Pension and Post-retirement Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net (loss) (1) 0 (2) (2)
Reclassification from AOCI | Amortization of actuarial losses        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Income tax (benefit) 0 1 1 1
General and administrative $ (1) $ (1) $ (3) $ (3)