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FAIR VALUE, Changes in Fair Value for Level 3 Assets (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Trading assets        
Changes in Level 3 recurring fair value measurements, assets [Roll Forward]        
Fair value beginning of period $ 2 $ 1 $ 4 $ 3
Total gains/(losses) included in earnings 0 1 1 2
Purchases and contributions 9 27 59 66
Sales and distributions (8) (27) (61) (69)
Transfers:        
Into Level 3 0 0 0 0
Out of Level 3 0 0 0 0
Fair value end of period 3 2 3 2
Unrealized gains/(losses) for the period included in earnings for instruments held at the end of the reporting period 0 0 0 0
Derivative assets        
Changes in Level 3 recurring fair value measurements, assets [Roll Forward]        
Fair value beginning of period   6   4
Total gains/(losses) included in earnings   (5)   (3)
Purchases and contributions   0   0
Sales and distributions   0   0
Transfers:        
Into Level 3   0   0
Out of Level 3   0   0
Fair value end of period   1   1
Unrealized gains/(losses) for the period included in earnings for instruments held at the end of the reporting period   (5)   (2)
Other investments        
Changes in Level 3 recurring fair value measurements, assets [Roll Forward]        
Fair value beginning of period 7 7 7 7
Total gains/(losses) included in earnings 0 0 0 0
Purchases and contributions 0 0 0 0
Sales and distributions 0 0 0 0
Transfers:        
Into Level 3 0 0 0 0
Out of Level 3 0 0 0 0
Fair value end of period 7 7 7 7
Unrealized gains/(losses) for the period included in earnings for instruments held at the end of the reporting period $ 0 $ 0 $ 0 $ 0