v3.26.1
Fair Value Accounting - Schedule of Assets and Liabilities Measured at Estimated Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Assets    
Total securities available for sale $ 18,153 $ 6,567
Mortgage loans held for sale 42 0
Derivatives Not Designated as Hedging Instruments    
Liabilities    
Estimated fair value of derivative liabilities 169 40
Visa derivative | Derivatives Not Designated as Hedging Instruments    
Liabilities    
Estimated fair value of derivative liabilities 2 0
U.S. Treasury securities    
Assets    
Total securities available for sale 2,838 1,586
U.S. Government agency securities    
Assets    
Total securities available for sale 188 195
Mortgage-backed securities    
Assets    
Total securities available for sale 14,355 2,794
State and municipal securities    
Assets    
Total securities available for sale 496 1,709
Corporate notes and other    
Assets    
Total securities available for sale 276  
Fair Value, Measurements, Recurring Basis    
Assets    
Total trading securities 9 0
Total securities available for sale 18,153 6,567
Other investments 332 253
Mutual funds held in rabbi trusts 100 13
Derivative assets 190 210
Liabilities    
Mutual funds held in rabbi trusts 94 7
Derivative liabilities 178 80
Fair Value, Measurements, Recurring Basis | U.S. Treasury securities    
Assets    
Total trading securities 3 0
Total securities available for sale 2,838 1,586
Fair Value, Measurements, Recurring Basis | Asset-backed securities    
Assets    
Total trading securities 5 0
Fair Value, Measurements, Recurring Basis | Other investments    
Assets    
Total trading securities 1 0
Fair Value, Measurements, Recurring Basis | U.S. Government agency securities    
Assets    
Total securities available for sale 188 195
Fair Value, Measurements, Recurring Basis | Mortgage-backed securities    
Assets    
Total securities available for sale 14,355 2,794
Fair Value, Measurements, Recurring Basis | State and municipal securities    
Assets    
Total securities available for sale 496 1,709
Fair Value, Measurements, Recurring Basis | Corporate notes and other    
Assets    
Total securities available for sale 276 283
Fair Value, Measurements, Recurring Basis | Level 1    
Assets    
Total trading securities 3 0
Total securities available for sale 2,838 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 2,838 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 | Other investments    
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 6 0
Total securities available for sale 15,315 4,981
Mortgage loans held for sale 42 0
Other investments 38 23
Mutual funds held in rabbi trusts 0 0
Derivative assets 190 210
Liabilities    
Mutual funds held in rabbi trusts 0 0
Derivative liabilities 178 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 5 0
Fair Value, Measurements, Recurring Basis | Level 2 | Other investments    
Assets    
Total trading securities 1 0
Fair Value, Measurements, Recurring Basis | Level 2 | U.S. Government agency securities    
Assets    
Total securities available for sale 188 195
Fair Value, Measurements, Recurring Basis | Level 2 | Mortgage-backed securities    
Assets    
Total securities available for sale 14,355 2,794
Fair Value, Measurements, Recurring Basis | Level 2 | State and municipal securities    
Assets    
Total securities available for sale 496 1,709
Fair Value, Measurements, Recurring Basis | Level 2 | Corporate notes and other    
Assets    
Total securities available for sale 276 283
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 294 230
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 | Other investments    
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