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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Statement of Comprehensive Income [Abstract]    
Net income $ 5,853 $ 5,119
Investment securities:    
Net unrealized gain (loss) (2) (24)
Income tax effect 0 6
Defined benefit pension and other postretirement plans:    
Reclassification adjustments 3 1
Income tax effect (1) 0
Derivative instruments:    
Net unrealized gain (loss) 7 168
Income tax effect 4 (25)
Reclassification adjustments 64 (42)
Income tax effect (13) 7
Foreign currency translation adjustments:    
Translation adjustments 37 (935)
Income tax effect (100) (95)
Other comprehensive income (loss) (1) (939)
Comprehensive income $ 5,852 $ 4,180