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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]    
Net income $ 5,119 $ 4,890
Investment securities:    
Net unrealized gain (loss) (24) 58
Income tax effect 6 (12)
Defined benefit pension and other postretirement plans:    
Reclassification adjustments 1 3
Income tax effect 0 (1)
Derivative instruments:    
Net unrealized gain (loss) 168 (77)
Income tax effect (25) 16
Reclassification adjustments (42) 39
Income tax effect 7 (9)
Foreign currency translation adjustments:    
Translation adjustments (935) 588
Income tax effect (95) 57
Other comprehensive income (loss) (939) 662
Comprehensive income $ 4,180 $ 5,552