v3.26.3
Goodwill and Mortgage Servicing Rights - Mortgage Servicing Rights (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Mortgage Servicing Rights [Roll Forward]        
Fair value at beginning of period $ 9,156 $ 8,996 $ 9,167 $ 9,121
MSR activity:        
Originations of MSRs 210 102 556 297
Purchase of MSRs 12 246 41 526
Disposition of MSRs 3 1 7 8
Net additions/(dispositions) 225 349 604 831
Changes due to collection/realization of expected cash flows (260) (266) (794) (799)
Changes in valuation due to inputs and assumptions:        
Changes due to market interest rates and other 598 (3) 736 (44)
Changes in valuation due to other inputs and assumptions:        
Projected cash flows (e.g., cost to service) 54 (37) 54 (36)
Discount rates 0 0 0 (1)
Prepayment model changes and other 2 71 8 38
Total changes in valuation due to other inputs and assumptions 56 34 62 1
Total changes in valuation due to inputs and assumptions 654 31 798 (43)
Fair value at end of period 9,775 9,110 9,775 9,110
Changes in unrealized gains/(losses) included in income related to MSRs 654 31 798 (43)
Contractual service fees, late fees and other ancillary fees included in income 409 404 1,223 1,218
Third-party mortgage loans serviced 661,000 669,000 661,000 669,000
Servicer advances, net of an allowance for uncollectible amounts $ 395 $ 415 $ 395 $ 415