v3.26.1
SHAREHOLDERS' EQUITY, Schedule of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance beginning of period     $ 12,504  
OCI:        
Balance end of period $ 12,610 $ 12,227 12,610 $ 12,227
Accumulated other comprehensive (loss) income        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance beginning of period (348) (655) (396) (502)
OCI:        
OCI before reclassifications and taxes (14) 143 46 (21)
Amounts reclassified from AOCI, before tax (2) (5) (5) (10)
Pre-tax net OCI (16) 138 41 (31)
Income tax effect (4) (29) (13) (13)
OCI for the period, net of tax (20) 109 28 (44)
Balance end of period (368) (546) (368) (546)
Subtotal: net investment hedges and currency translations        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance beginning of period (5) (77) (12) (24)
OCI:        
OCI before reclassifications and taxes (4) 20 0 (15)
Amounts reclassified from AOCI, before tax 0 0 0 0
Pre-tax net OCI (4) 20 0 (15)
Income tax effect (6) (1) (3) (19)
OCI for the period, net of tax (10) 19 (3) (34)
Balance end of period (15) (58) (15) (58)
Net investment hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance beginning of period 174 202 184 145
OCI:        
OCI before reclassifications and taxes 22 4 9 79
Amounts reclassified from AOCI, before tax 0 0 0 0
Pre-tax net OCI 22 4 9 79
Income tax effect (6) (1) (3) (19)
OCI for the period, net of tax 16 3 6 60
Balance end of period 190 205 190 205
Currency translations        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance beginning of period (179) (279) (196) (169)
OCI:        
OCI before reclassifications and taxes (26) 16 (9) (94)
Amounts reclassified from AOCI, before tax 0 0 0 0
Pre-tax net OCI (26) 16 (9) (94)
Income tax effect 0 0 0 0
OCI for the period, net of tax (26) 16 (9) (94)
Balance end of period (205) (263) (205) (263)
Available- for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance beginning of period (348) (591) (391) (485)
OCI:        
OCI before reclassifications and taxes (12) 125 44 (19)
Amounts reclassified from AOCI, before tax 0 0 0 2
Pre-tax net OCI (12) 125 44 (17)
Income tax effect 2 (30) (11) 6
OCI for the period, net of tax (10) 95 33 (11)
Balance end of period (358) (496) (358) (496)
Cash flow hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance beginning of period 5 13 7 7
OCI:        
OCI before reclassifications and taxes 2 (2) 2 13
Amounts reclassified from AOCI, before tax (2) (5) (5) (12)
Pre-tax net OCI 0 (7) (3) 1
Income tax effect 0 2 1 0
OCI for the period, net of tax 0 (5) (2) 1
Balance end of period $ 5 $ 8 $ 5 $ 8