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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 4,156 $ 3,411 $ 12,592 $ 11,017
Investment securities:        
Net unrealized gain (loss) (18) (43) 33 (93)
Income tax effect 4 10 (7) 20
Defined benefit pension and other postretirement plans:        
Net unrealized actuarial gain (loss) and prior service credit (cost) 1 0 6 (1)
Income tax effect 0 0 (1) 0
Reclassification adjustments 3 0 7 2
Income tax effect (1) 0 (1) 0
Derivative instruments:        
Net unrealized gain (loss) (4) 348 (195) 539
Income tax effect 5 (68) 36 (103)
Reclassification adjustments 18 (9) 17 (48)
Income tax effect (10) 0 (17) 4
Foreign currency translation adjustments 14 (1,100) 1,513 (2,023)
Other comprehensive income (loss), net of tax 12 (862) 1,391 (1,703)
Comprehensive income $ 4,168 $ 2,549 $ 13,983 $ 9,314