v3.26.1
Goodwill and Mortgage Servicing Rights - Mortgage Servicing Rights (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mortgage Servicing Rights [Roll Forward]        
Fair value at beginning of period $ 9,093 $ 9,127 $ 9,167 $ 9,121
MSR activity:        
Originations of MSRs 200 84 346 195
Purchase of MSRs 19 1 29 280
Disposition of MSRs 2 3 4 7
Net additions/(dispositions) 221 88 379 482
Changes due to collection/realization of expected cash flows (264) (272) (534) (533)
Changes in valuation due to inputs and assumptions:        
Changes due to market interest rates and other 82 59 138 (41)
Changes in valuation due to other inputs and assumptions:        
Projected cash flows (e.g., cost to service) 0 0 0 1
Discount rates 0 (1) 0 (1)
Prepayment model changes and other 24 (5) 6 (33)
Total changes in valuation due to other inputs and assumptions 24 (6) 6 (33)
Total changes in valuation due to inputs and assumptions 106 53 144 (74)
Fair value at end of period 9,156 8,996 9,156 8,996
Changes in unrealized gains/(losses) included in income related to MSRs 106 53 144 (74)
Contractual service fees, late fees and other ancillary fees included in income 404 412 814 814
Third-party mortgage loans serviced 661,000 658,000 661,000 658,000
Servicer advances, net of an allowance for uncollectible amounts $ 400 $ 440 $ 400 $ 440