v3.26.1
Fair Value Measurements - Changes in Fair Value of Level 3 Assets and Liabilities (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Assets, beginning balance $ 287 $ 105 $ 253 $ 233
Assets, Total Realized/Unrealized Gains (Losses) 160 66 102 26
Assets, Purchases 55 0 145 2
Assets, Issuances 0 0 0 0
Assets, Settlements (85) (10) (115) (136)
Assets, Transfers Into Level 3 6 5 12 (1)
Assets Transfers out of Level 3 (30) (33) (4) 9
Assets, ending balance 393 133 393 133
Assets, Current Period Unrealized Gains (Losses) Still Held 106 35 70 23
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total liabilities, beginning balance (2,947) (2,241) (2,731) (2,444)
Total Realized/Unrealized Gains (Losses) (200) (100) (223) (97)
Purchases 0 0 0 0
Issuances (1,088) (343) (1,839) (662)
Settlements 535 186 929 447
Transfers Into Level 3 (269) (854) (590) (1,200)
Transfers Out of Level 3 648 737 1,133 1,341
Total liabilities, ending balance (3,321) (2,615) (3,321) (2,615)
Current Period Unrealized Gains (Losses) Still Held (119) (44) (114) (40)
Derivatives liability        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total liabilities, ending balance (188) (180) (188) (180)
Equity contracts        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Derivatives, net, Beginning Balance (41) (30) 11 (18)
Derivatives, net, Total Realized/Unrealized Gains (Losses) 163 66 103 25
Derivatives, net, Purchases 0 0 0 0
Derivatives, net, Issuances 0 0 0 0
Derivatives, net, Settlements (34) (7) (58) (14)
Derivatives, net, Transfers into Level 3 0 (8) 6 (14)
Derivatives, net, Transfers out of Level 3 (30) (33) (4) 9
Derivatives, net, Ending Balance 58 (12) 58 (12)
Derivatives, net, Current Period Unrealized Gains (Losses) Still Held 109 35 74 22
Asset-backed securities available-for-sale        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Assets, beginning balance 76 94 76 97
Assets, Total Realized/Unrealized Gains (Losses) (3) 0 (3) 1
Assets, Purchases 0 0 0 0
Assets, Issuances 0 0 0 0
Assets, Settlements (2) (2) (2) (6)
Assets, Transfers Into Level 3 0 0 0 0
Assets Transfers out of Level 3 0 0 0 0
Assets, ending balance 71 92 71 92
Assets, Current Period Unrealized Gains (Losses) Still Held (3) 0 (4) 1
Derivative assets        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Assets, ending balance 231 147 231 147
Loans held for sale | Loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Assets, beginning balance 252 41 166 154
Assets, Total Realized/Unrealized Gains (Losses) 0 0 2 0
Assets, Purchases 55 0 145 2
Assets, Issuances 0 0 0 0
Assets, Settlements (49) (1) (55) (116)
Assets, Transfers Into Level 3 6 13 6 13
Assets Transfers out of Level 3 0 0 0
Assets, ending balance 264 53 264 53
Assets, Current Period Unrealized Gains (Losses) Still Held 0 0 0 0
Domestic deposits        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total liabilities, beginning balance (506) (295) (377) (291)
Total Realized/Unrealized Gains (Losses) (14) (9) (16) (10)
Purchases 0 0 0 0
Issuances (91) (75) (171) (90)
Settlements 13 10 23 24
Transfers Into Level 3 (48) (175) (140) (243)
Transfers Out of Level 3 77 124 112 190
Total liabilities, ending balance (569) (420) (569) (420)
Current Period Unrealized Gains (Losses) Still Held (7) (2) (2) (1)
Long-term debt        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total liabilities, beginning balance (2,441) (1,946) (2,354) (2,153)
Total Realized/Unrealized Gains (Losses) (186) (91) (207) (87)
Purchases 0 0 0 0
Issuances (997) (268) (1,668) (572)
Settlements 522 176 906 423
Transfers Into Level 3 (221) (679) (450) (957)
Transfers Out of Level 3 571 613 1,021 1,151
Total liabilities, ending balance (2,752) (2,195) (2,752) (2,195)
Current Period Unrealized Gains (Losses) Still Held $ (112) $ (42) $ (112) $ (39)