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Fair Value Hierarchy - Summary of Changes in Fair Value for Level 3 Loans (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Loans Receivable        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 681 $ 636 $ 683 $ 823
Net realized gains/(losses) 9 15 34 28
Net unrealized gains/(losses) (7) 3 (2) (20)
Purchases 18 17 90 99
Sales (5) (15) (9) (58)
Settlements (69) (51) (201) (259)
Transfers into level 3 69 49 102 43
Transfers out of level 3 (25) (42) (26) (44)
Ending balance 671 612 671 612
Corporate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 412 284 403 344
Net realized gains/(losses) 1 7 5 9
Net unrealized gains/(losses) (3) 3 4 (11)
Purchases 14 15 29 97
Sales 0 (4) 0 (4)
Settlements (14) (26) (70) (150)
Transfers into level 3 6 48 46 42
Transfers out of level 3 (25) 0 (26) 0
Ending balance 391 327 391 327
Real estate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 112 142 117 261
Net realized gains/(losses) 3 4 8 8
Net unrealized gains/(losses) 1 (2) 3 (5)
Purchases 0 2 3 1
Sales (2) (11) (6) (52)
Settlements (12) (11) (23) (89)
Transfers into level 3 0 1 0 1
Ending balance 102 125 102 125
Other collateralized        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 132 146 135 136
Net realized gains/(losses) 3 1 14 4
Net unrealized gains/(losses) (3) 0 (6) (2)
Purchases 4 0 58 0
Sales (3) 0 (2) (1)
Settlements (41) (9) (100) (10)
Transfers into level 3 63 0 56 0
Transfers out of level 3 0 (11) 0 0
Ending balance 155 127 155 127
Other        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 25 64 28 82
Net realized gains/(losses) 2 3 7 7
Net unrealized gains/(losses) (2) 2 (3) (2)
Purchases 0 0 0 1
Sales 0 0 (1) (1)
Settlements (2) (5) (8) (10)
Transfers out of level 3 0 (31) 0 (44)
Ending balance $ 23 $ 33 $ 23 $ 33