v3.21.2
Income Taxes - Information that Causes the Income Tax Expense to Differ from the Amount of Income Tax Determined by Applying the Applicable U.S. Federal Statutory Rate of 35% to Pretax Income (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]      
U.S. federal income tax at statutory rate $ 3,373 $ 2,896 $ 3,126
State income taxes, net of federal benefit 222 199 223
Non-U.S. tax effect, net of federal benefit (505) (483) (527)
Remeasurement of deferred tax balances 1,007 329 0
Conclusion of audits (255) 0 0
Other, net (90) (17) (18)
Total income tax provision $ 3,752 $ 2,924 $ 2,804
U.S. federal income tax at statutory rate, percent 21.00% 21.00% 21.00%
State income taxes, net of federal benefit, percent 1.00% 2.00% 2.00%
Non-U.S. tax effect, net of federal benefit, percent (3.00%) (4.00%) (4.00%)
Remeasurement of deferred tax liability, percent 6.00% 2.00% 0.00%
Conclusion of audits, percent (2.00%) 0.00% 0.00%
Other, net, percent 0.00% 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Percent, Total 23.00% 21.00% 19.00%