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Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 2,726 $ 2,528 $ 2,451
Additions for tax positions related to the current year 169 240 128
Additions for tax positions of prior years 31 33 129
Reductions for tax positions of prior years (48) (6) (27)
Settlements with taxing authorities (7) (24) (54)
Statute closings and audit resolutions (334) (45) (99)
Ending balance $ 2,537 $ 2,726 $ 2,528