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Income Taxes - Components of Income Tax Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Federal        
Current $ (53) $ 414 $ 966 $ 1,002
Deferred 306 (59) (459) 26
Federal income tax 253 355 507 1,028
State        
Current 92 140 298 280
Deferred 2 (28) (134) (14)
State income tax 94 112 164 266
Applicable income taxes $ 347 $ 467 $ 671 $ 1,294