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Income Taxes - Reconciliation of income tax rate (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income before income taxes $ 6,959 $ 6,089 $ 2,628
Statutory federal income tax rate on income from operations 1,461 1,279 552
Tax credits (45) (33) (34)
Share-based payments (30) (24) (16)
Tax-exempt income (24) (27) (24)
State income taxes 35 41 27
Tax Legislation benefit 0 0 (29)
Other (14) 6 (8)
Total income tax expense $ 1,383 $ 1,242 $ 468
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Statutory federal income tax rate on income from operations 21.00% 21.00% 21.00%
Tax credits (0.70%) (0.50%) (1.30%)
Share-based payments (0.40%) (0.40%) (0.60%)
Tax-exempt income (0.30%) (0.40%) (0.90%)
State income taxes 0.50% 0.70% 1.00%
Tax Legislation benefit 0.00% 0.00% (1.10%)
Other (0.20%) 0.00% (0.30%)
Effective income tax rate on income from operations 19.90% 20.40% 17.80%