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Components of Other Comprehensive Income (Loss) - Schedule of Reclassification from AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Realized (gains) losses on cash flow hedges $ 1,722 $ 1,394 $ 1,286
Amortization of prior service cost and net actuarial (gain) loss 172 150 183
Income tax expense 76 134 157
Total reclassification from AOCI (857) (452) (557)
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Total reclassification from AOCI 7 11 11
Reclassification out of Accumulated Other Comprehensive Income | Securities AFS      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Realized (gains) losses on securities AFS 4 0 0
Income tax expense (1) 0 0
Total reclassification from AOCI 3 0 0
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Realized (gains) losses on cash flow hedges (8) 5 3
Income tax expense 2 (1) (1)
Total reclassification from AOCI (6) 4 2
Reclassification out of Accumulated Other Comprehensive Income | Pension and Post-retirement Plans      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Amortization of prior service cost and net actuarial (gain) loss 13 10 12
Income tax expense (3) (3) (3)
Total reclassification from AOCI $ 10 $ 7 $ 9