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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Income tax expense (benefit) $ (54) $ 1
Net income (loss) (327) 2,006
Interest expense 889 479
General and administrative 236 $ 136
Accumulated Defined Benefit Plans Adjustment Attributable to Parent    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Income tax expense (benefit) 0  
General and administrative (1)  
Reclassifications, net of tax (1)  
Past service liability    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
General and administrative 0  
Actuarial losses    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
General and administrative (1)  
Reclassification from AOCI    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net income (loss) 16  
Reclassification from AOCI | Unrealized gains on available-for-sale securities:    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net (loss) on securities 0  
Income tax expense (benefit) 0  
Net income (loss) 0  
Reclassification from AOCI | Unrealized gains on cash flow hedges:    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Income tax expense (benefit) (6)  
Net income (loss) 17  
Interest expense $ 23