XML 89 R74.htm IDEA: XBRL DOCUMENT v3.20.2
Income Taxes - Reconciliation of Expected Income Tax Expense at Federal Statutory Rate of 21 Percent to Company's Applicable 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
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Tax at statutory rate $ 406 $ 501 $ 867 $ 1,417
State income tax, at statutory rates, net of federal tax benefit 75 99 170 277
Tax credits and benefits, net of related expenses (82) (97) (280) (307)
Exam resolutions (47)   (47) (49)
Tax-exempt income (29) (29) (87) (92)
Other items 24 (7) 48 48
Applicable income taxes $ 347 $ 467 $ 671 $ 1,294