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Income Taxes - Reconciliation of income tax rate (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
(Loss) income before income taxes $ (1,858) $ 6,448 $ 6,802
Statutory federal income tax rate on income from operations (390) 1,354 1,428
State income taxes 0 13 31
Tax credits (55) (42) (24)
Tax-exempt income (17) (18) (23)
Share-based payments (22) (18) (30)
Other (10) 0 (9)
Total income tax (benefit) expense $ (494) $ 1,289 $ 1,373
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Statutory federal income tax rate on income from operations 21.00% 21.00% 21.00%
State income taxes 0.00% 0.20% 0.40%
Tax credits 3.00% (0.60%) (0.40%)
Tax-exempt income 0.90% (0.30%) (0.30%)
Share-based payments 1.20% (0.30%) (0.40%)
Other 0.50% 0.00% (0.10%)
Effective income tax rate on income from operations 26.60% 20.00% 20.20%