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Fair Value Hierarchy - Other Financial Assets and Liabilities Level 3 Rollforward (Detail) - Other Financial Liabilities - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 198 $ 174 $ 194 $ 187
Net unrealized gains/(losses) (8) 9 (4) 7
Sales 0 0 0 (11)
Ending balance 190 183 190 183
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance (25,706) (22,118) (22,345) (24,275)
Net realized gains/(losses) (114) (96) (201) (161)
Net unrealized gains/(losses) (875) (1,351) (1,804) (830)
Issuances (6,053) (3,788) (12,480) (8,450)
Settlements 4,384 3,008 6,401 9,325
Transfers into level 3 (770) (887) (734) (770)
Transfers out of level 3 2,861 2,773 4,890 2,702
Ending balance (26,273) (22,459) (26,273) (22,459)
Deposits        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance (3,010) (2,904) (3,045) (2,737)
Net realized gains/(losses) (1) 0 (4) 0
Net unrealized gains/(losses) (202) (83) (260) (157)
Issuances (128) (319) (560) (737)
Settlements 206 225 650 655
Transfers into level 3 (80) 0 (67) (141)
Transfers out of level 3 16 121 87 157
Ending balance (3,199) (2,960) (3,199) (2,960)
Other secured financings        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance (468) (1,545) (551) (2,022)
Net realized gains/(losses) 4 (7) 4 (7)
Net unrealized gains/(losses) (6) (25) (30) 13
Issuances 129 33 103 60
Settlements 53 906 109 1,478
Transfers into level 3 (142) 0 (142) (106)
Transfers out of level 3 0 0 25 0
Ending balance (688) (704) (688) (704)
Unsecured short-term borrowings        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance (7,113) (4,554) (5,294) (5,589)
Net realized gains/(losses) (43) (33) (54) (5)
Net unrealized gains/(losses) (160) (162) (399) (231)
Issuances (3,741) (2,205) (5,355) (4,401)
Settlements 2,838 1,017 3,349 3,763
Transfers into level 3 (343) (431) (283) (94)
Transfers out of level 3 1,586 833 1,060 1,022
Ending balance (6,976) (5,535) (6,976) (5,535)
Unsecured long-term borrowings        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance (15,026) (13,051) (13,379) (13,848)
Net realized gains/(losses) (74) (56) (147) (149)
Net unrealized gains/(losses) (514) (1,065) (1,109) (454)
Issuances (2,055) (1,231) (6,462) (3,252)
Settlements 1,287 860 2,293 3,429
Transfers into level 3 (205) (456) (242) (429)
Transfers out of level 3 1,259 1,819 3,718 1,523
Ending balance (15,328) (13,180) (15,328) (13,180)
Other liabilities        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance (89) (64) (76) (79)
Net unrealized gains/(losses) 7 (16) (6) (1)
Ending balance $ (82) $ (80) $ (82) $ (80)