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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 4,257 $ 3,647 $ 8,436 $ 7,606
Investment securities:        
Net unrealized gain (loss) 36 (40) 51 (50)
Income tax effect (8) 8 (11) 10
Defined benefit pension and other postretirement plans:        
Net unrealized actuarial gain (loss) and prior service credit (cost) 3 (2) 5 (1)
Income tax effect 0 0 (1) 0
Reclassification adjustments 3 1 4 2
Derivative instruments:        
Net unrealized gain (loss) (75) 77 (191) 191
Income tax effect 17 (13) 31 (35)
Reclassification adjustments 6 (33) (1) (39)
Income tax effect (3) 4 (7) 4
Foreign currency translation adjustments 290 (335) 1,499 (923)
Other comprehensive income (loss), net of tax 269 (333) 1,379 (841)
Comprehensive income $ 4,526 $ 3,314 $ 9,815 $ 6,765