v3.26.1
Fair Value Measurements, Changes in Level 3 Fair Value Assets and Liabilities on a Recurring Basis (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Net Derivative Assets (Liabilities):        
Balance, beginning of period $ (1,095) $ (3,550) $ (1,212) $ (4,803)
Net gains (losses) (567) 81 (563) 1,086
Purchases 9 6 11 8
Sales (9) (1) (13) (1)
Settlements 271 122 474 499
Transfers into Level 3 (74) (57) (311) (197)
Transfers out of Level 3 167 2,150 316 2,159
Balance, end of period (1,298) (1,249) (1,298) (1,249)
Net unrealized gains (losses) related to assets and liabilities held at period end $ (408) $ 119 $ (240) $ 318
Fair Value Disclosures, Textual [Abstract]        
Fair value, net derivative asset (liability), recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] Net gains (losses) from trading and securities, Mortgage banking, Other Net gains (losses) from trading and securities, Mortgage banking, Other Net gains (losses) from trading and securities, Mortgage banking, Other Net gains (losses) from trading and securities, Mortgage banking, Other
Fair value, net derivative asset (liability), recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income [Extensible Enumeration] Net gains (losses) from trading and securities, Mortgage banking, Other Net gains (losses) from trading and securities, Mortgage banking, Other Net gains (losses) from trading and securities, Mortgage banking, Other Net gains (losses) from trading and securities, Mortgage banking, Other
Interest rate contracts [Member]        
Net Derivative Assets (Liabilities):        
Balance, beginning of period $ (271) $ (2,330) $ (142) $ (3,603)
Net gains (losses) (114) 230 (277) 1,098
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 25 24 30 429
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 16 1,896 45 1,896
Balance, end of period (344) (180) (344) (180)
Net unrealized gains (losses) related to assets and liabilities held at period end (113) 178 (242) 293
Equity contracts [Member]        
Net Derivative Assets (Liabilities):        
Balance, beginning of period (833) (1,124) (1,124) (1,167)
Net gains (losses) (419) (121) (237) (67)
Purchases 6 0 6 0
Sales (8) 0 (8) 0
Settlements 225 139 432 259
Transfers into Level 3 (74) (57) (309) (197)
Transfers out of Level 3 167 118 304 127
Balance, end of period (936) (1,045) (936) (1,045)
Net unrealized gains (losses) related to assets and liabilities held at period end (262) (77) 20 1
Other derivative contracts [Member]        
Net Derivative Assets (Liabilities):        
Balance, beginning of period 9 (96) 54 (33)
Net gains (losses) (34) (28) (49) 55
Purchases 3 6 5 8
Sales (1) (1) (5) (1)
Settlements 21 (41) 12 (189)
Transfers into Level 3 0 0 (2) 0
Transfers out of Level 3 (16) 136 (33) 136
Balance, end of period (18) (24) (18) (24)
Net unrealized gains (losses) related to assets and liabilities held at period end (33) 18 (18) 24
Long-term debt [Member]        
Liabilities:        
Balance, beginning of period 0 0 0 0
Net gains (losses) 4 0 4 0
Purchases (210) 0 (210) 0
Net gains (losses) 0 0 0 0
Settlements 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of level 3 0 0 0 0
Balance, end of period (206) 0 (206) 0
Net unrealized gains (losses) related to liabilities held at period end $ 4 $ 0 $ 4 $ 0
Fair Value Disclosures, Textual [Abstract]        
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net gains (losses) from trading and securities, Interest Expense, Long-Term Debt Net gains (losses) from trading and securities, Interest Expense, Long-Term Debt Net gains (losses) from trading and securities, Interest Expense, Long-Term Debt Net gains (losses) from trading and securities, Interest Expense, Long-Term Debt
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net gains (losses) from trading and securities, Interest Expense, Long-Term Debt Net gains (losses) from trading and securities, Interest Expense, Long-Term Debt Net gains (losses) from trading and securities, Interest Expense, Long-Term Debt Net gains (losses) from trading and securities, Interest Expense, Long-Term Debt
Trading assets, debt instruments [Member]        
Assets:        
Balance, beginning of period $ 215 $ 153 $ 162 $ 144
Net gains (losses) (8) (11) (24) (18)
Purchases 72 10 299 23
Sales (58) (20) (287) (27)
Settlements (6) (5) (12) (15)
Transfers into Level 3 115 13 199 41
Transfers out of Level 3 (6) (7) (13) (15)
Balance, end of period 324 133 324 133
Net unrealized gains (losses) related to assets and liabilities held at period end $ (10) $ (8) $ (39) $ (16)
Fair Value Disclosures, Textual [Abstract]        
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] Net gains (losses) from trading and securities Net gains (losses) from trading and securities Net gains (losses) from trading and securities Net gains (losses) from trading and securities
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income [Extensible Enumeration] Net gains (losses) from trading and securities Net gains (losses) from trading and securities Net gains (losses) from trading and securities Net gains (losses) from trading and securities
Available-for-sale debt securities [Member]        
Assets:        
Balance, beginning of period $ 225 $ 211 $ 233 $ 216
Net gains (losses) 6 (2) (3) (1)
Purchases 1 0 6 3
Sales 0 0 0 0
Settlements (2) 0 (6) (9)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 230 209 230 209
Net unrealized gains (losses) related to assets and liabilities held at period end 6 (1) (3) (1)
Fair Value Disclosures, Textual [Abstract]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in other comprehensive income (loss) 7 (1) (2) (1)
Fair value, asset, recurring basis, still held, unrealized gain (loss), OCI $ 7 $ (1) $ (2) $ (1)
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] Net gains (losses) from trading and securities Net gains (losses) from trading and securities Net gains (losses) from trading and securities Net gains (losses) from trading and securities
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income [Extensible Enumeration] Net gains (losses) from trading and securities Net gains (losses) from trading and securities Net gains (losses) from trading and securities Net gains (losses) from trading and securities
Mortgage servicing rights [Member] | Total Consumer [Member] | Residential mortgage [Member]        
Assets:        
Balance, beginning of period $ 5,608 $ 6,536 $ 5,696 $ 6,844
Net gains (losses) (60) (108) (166) (365)
Purchases 22 26 39 51
Sales (227) (37) (226) (113)
Settlements 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 5,343 6,417 5,343 6,417
Net unrealized gains (losses) related to assets and liabilities held at period end $ 102 $ 88 $ 158 $ 20
Fair Value Disclosures, Textual [Abstract]        
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] Mortgage banking Mortgage banking Mortgage banking Mortgage banking
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income [Extensible Enumeration] Mortgage banking Mortgage banking Mortgage banking Mortgage banking
Other fair value instruments [Member]        
Assets and Liabilities:        
Balance, beginning of period $ 150 $ 163 $ 222 $ 278
Net gains (losses) 76 33 21 (43)
Purchases 8 11 17 16
Sales (32) 0 (62) 0
Settlements (2) (4) (5) (7)
Transfers into level 3 5 5 14 10
Transfers out of Level 3 (9) (10) (11) (56)
Balance, end of period 196 198 196 198
Net unrealized gains (losses) related to assets and liabilities held at period end 73 33 20 (43)
Fair Value Disclosures, Textual [Abstract]        
Fair value, recurring basis, unobservable input reconciliation, asset (liability), gain (loss), OCI (5) (10) 2 (9)
Fair value, asset (liability), recurring basis, still held, unrealized gain (loss), OCI $ (5) $ (10) $ 2 $ (9)
Fair value, asset (liability), recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] Mortgage banking, Other Mortgage banking, Other Mortgage banking, Other Mortgage banking, Other
Fair value, asset (liability), recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income [Extensible Enumeration] Mortgage banking, Other Mortgage banking, Other Mortgage banking, Other Mortgage banking, Other