v3.26.3
Fair Value Accounting - Schedule of Assets and Liabilities Measured at Estimated Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Assets    
Total securities available for sale $ 18,190 $ 6,567
Mortgage loans held for sale 28 0
Derivatives Not Designated as Hedging Instruments    
Liabilities    
Estimated fair value of derivative liabilities 360 40
Visa derivative | Derivatives Not Designated as Hedging Instruments    
Liabilities    
Estimated fair value of derivative liabilities 3 0
U.S. Treasury securities    
Assets    
Total securities available for sale 2,761 1,586
U.S. Government agency securities    
Assets    
Total securities available for sale 183 195
Mortgage-backed securities    
Assets    
Total securities available for sale 14,534 2,794
State and municipal securities    
Assets    
Total securities available for sale 444 1,709
Corporate notes and other    
Assets    
Total securities available for sale 268  
Fair Value, Measurements, Recurring Basis    
Assets    
Total trading securities 11 0
Total securities available for sale 18,190 6,567
Other investments 341 253
Mutual funds held in rabbi trusts 100 13
Derivative assets 243 210
Liabilities    
Mutual funds held in rabbi trusts 94 7
Derivative liabilities 364 80
Fair Value, Measurements, Recurring Basis | U.S. Treasury securities    
Assets    
Total trading securities 3 0
Total securities available for sale 2,761 1,586
Fair Value, Measurements, Recurring Basis | Asset-backed securities    
Assets    
Total trading securities 8 0
Fair Value, Measurements, Recurring Basis | U.S. Government agency securities    
Assets    
Total securities available for sale 183 195
Fair Value, Measurements, Recurring Basis | Mortgage-backed securities    
Assets    
Total securities available for sale 14,534 2,794
Fair Value, Measurements, Recurring Basis | State and municipal securities    
Assets    
Total securities available for sale 444 1,709
Fair Value, Measurements, Recurring Basis | Corporate notes and other    
Assets    
Total securities available for sale 268 283
Fair Value, Measurements, Recurring Basis | Level 1    
Assets    
Total trading securities 3 0
Total securities available for sale 2,761 1,586
Mortgage loans held for sale 0 0
Other investments 0 0
Mutual funds held in rabbi trusts 100 13
Derivative assets 0 0
Liabilities    
Mutual funds held in rabbi trusts 94 7
Derivative liabilities 0 0
Fair Value, Measurements, Recurring Basis | Level 1 | U.S. Treasury securities    
Assets    
Total trading securities 3 0
Total securities available for sale 2,761 1,586
Fair Value, Measurements, Recurring Basis | Level 1 | Asset-backed securities    
Assets    
Total trading securities 0 0
Fair Value, Measurements, Recurring Basis | Level 1 | U.S. Government agency securities    
Assets    
Total securities available for sale 0 0
Fair Value, Measurements, Recurring Basis | Level 1 | Mortgage-backed securities    
Assets    
Total securities available for sale 0 0
Fair Value, Measurements, Recurring Basis | Level 1 | State and municipal securities    
Assets    
Total securities available for sale 0 0
Fair Value, Measurements, Recurring Basis | Level 1 | Corporate notes and other    
Assets    
Total securities available for sale 0 0
Fair Value, Measurements, Recurring Basis | Level 2    
Assets    
Total trading securities 8 0
Total securities available for sale 15,429 4,981
Mortgage loans held for sale 28 0
Other investments 37 23
Mutual funds held in rabbi trusts 0 0
Derivative assets 243 210
Liabilities    
Mutual funds held in rabbi trusts 0 0
Derivative liabilities 364 80
Fair Value, Measurements, Recurring Basis | Level 2 | U.S. Treasury securities    
Assets    
Total trading securities 0 0
Total securities available for sale 0 0
Fair Value, Measurements, Recurring Basis | Level 2 | Asset-backed securities    
Assets    
Total trading securities 8 0
Fair Value, Measurements, Recurring Basis | Level 2 | U.S. Government agency securities    
Assets    
Total securities available for sale 183 195
Fair Value, Measurements, Recurring Basis | Level 2 | Mortgage-backed securities    
Assets    
Total securities available for sale 14,534 2,794
Fair Value, Measurements, Recurring Basis | Level 2 | State and municipal securities    
Assets    
Total securities available for sale 444 1,709
Fair Value, Measurements, Recurring Basis | Level 2 | Corporate notes and other    
Assets    
Total securities available for sale 268 283
Fair Value, Measurements, Recurring Basis | Level 3    
Assets    
Total trading securities 0 0
Total securities available for sale 0 0
Mortgage loans held for sale 0 0
Other investments 304 230
Mutual funds held in rabbi trusts 0 0
Derivative assets 0 0
Liabilities    
Mutual funds held in rabbi trusts 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring Basis | Level 3 | U.S. Treasury securities    
Assets    
Total trading securities 0 0
Total securities available for sale 0 0
Fair Value, Measurements, Recurring Basis | Level 3 | Asset-backed securities    
Assets    
Total trading securities 0 0
Fair Value, Measurements, Recurring Basis | Level 3 | U.S. Government agency securities    
Assets    
Total securities available for sale 0 0
Fair Value, Measurements, Recurring Basis | Level 3 | Mortgage-backed securities    
Assets    
Total securities available for sale 0 0
Fair Value, Measurements, Recurring Basis | Level 3 | State and municipal securities    
Assets    
Total securities available for sale 0 0
Fair Value, Measurements, Recurring Basis | Level 3 | Corporate notes and other    
Assets    
Total securities available for sale $ 0 $ 0