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Reclassifications Out of Accumulated Other Comprehensive Loss - Reclassifications of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax benefit $ 52 $ 51
Net income 155 145
Interest expense 97 $ 105
Reclassifications, net of tax [1] (4)  
Past service liability    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, before tax [1],[2] 0  
Actuarial losses    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, before tax [1],[2] 0  
Amortization of defined benefit pension    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, before tax [1] 0  
Income tax benefit [1] 0  
Reclassifications, net of tax [1] 0  
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains on available-for-sale securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on securities [1] 0  
Income tax benefit [1] 0  
Net income [1] 0  
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains on cash flow hedges    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax benefit [1] 2  
Net income [1] (4)  
Interest expense [1] $ (6)  
[1] Amounts in parentheses indicate expense items.
[2] See Note 8, “Pension and Other Post-Retirement Benefits,” for additional information.