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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]      
Net income $ 14,957 $ 12,311 $ 10,866
Investment securities:      
Net unrealized gain (loss) (133) (4) 1
Income tax effect 28 1 0
Reclassification adjustments 0 (1) (3)
Income tax effect 0 0 1
Defined benefit pension and other postretirement plans:      
Net unrealized actuarial gain (loss) and prior service credit (cost) (168) 178 (7)
Income tax effect 38 (41) 1
Reclassification adjustments 13 13 18
Income tax effect (3) (3) (3)
Derivative instruments:      
Net unrealized gain (loss) 917 19 (547)
Income tax effect (177) (1) 119
Reclassification adjustments (67) 15 (81)
Income tax effect 2 1 19
Foreign currency translation adjustments (3,255) (95) 1,511
Other comprehensive income (loss), net of tax (2,805) 82 1,029
Comprehensive income $ 12,152 $ 12,393 $ 11,895