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Reclassifications Out of Accumulated Other Comprehensive Loss - Reclassifications of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax (expense) benefit $ 50 $ 38 $ 161 $ 88
Net income 149 116 446 321
Interest expense $ 97 $ 136 302 $ 490
Reclassifications, net of tax [1]     (18)  
Past service liability        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, before tax [1],[2]      
Actuarial losses        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, before tax [1],[2]     (5)  
Amortization of defined benefit pension        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, before tax [1]     (5)  
Tax benefit [1]     1  
Reclassifications, net of tax [1]     (4)  
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains (losses) on available-for-sale securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gain (losses) on securities [1]      
Income tax (expense) benefit [1]      
Net income [1]      
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized loss on cash flow hedges        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax (expense) benefit     4  
Net income [1]     (14)  
Interest expense [1]     $ (18)  
[1] Amounts in parentheses indicate expense items.
[2] See Note 8, “Pension and Other Post-Retirement Benefits,” for additional information.