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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Statement of Comprehensive Income [Abstract]      
Net income $ 17,273 $ 14,957 $ 12,311
Investment securities:      
Net unrealized gain (loss) 53 (133) (4)
Income tax effect (11) 28 1
Reclassification adjustments 0 0 (1)
Defined benefit pension and other postretirement plans:      
Net unrealized actuarial gain (loss) and prior service credit (cost) 6 (168) 178
Income tax effect 0 38 (41)
Reclassification adjustments 10 13 13
Income tax effect (2) (3) (3)
Derivative instruments:      
Net unrealized gain (loss) (126) 917 19
Income tax effect 24 (177) (1)
Reclassification adjustments 49 (67) 15
Income tax effect (24) 2 1
Foreign currency translation adjustments:      
Translation adjustments 975 (3,255) (95)
Income tax effect 98 0 0
Other comprehensive income (loss) 1,052 (2,805) 82
Comprehensive income $ 18,325 $ 12,152 $ 12,393