v3.26.1
Derivative Instruments - Cumulative Hedging Adjustments and the Carrying Amount of Assets and Liabilities Designated in Fair Value Hedges (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]    
Increase (decrease) in cumulative amount of basis adjustments $ 3 $ 185
Available-for-sale investment securities    
Derivative Instruments, Gain (Loss) [Line Items]    
Carrying amount of the hedged assets 22,882 25,062
Cumulative hedging adjustment for hedged assets (257) 75
Cumulative hedging adjustment asset related to discontinued hedging relationships (18) 57
Carrying amount of assets related to discontinued hedging relationships 13,900 11,800
Amortized cost of the closed portfolios 20,300 20,700
Amortized cost of the closed portfolios designated as hedged 7,300 9,200
Increase (decrease) in cumulative amount of basis adjustments 6 175
Long-term debt    
Derivative Instruments, Gain (Loss) [Line Items]    
Carrying amount of the hedged liabilities 13,023 8,091
Cumulative hedging adjustment for hedged liabilities 22 153
Cumulative hedging adjustment liability related to discontinued hedging relationships (32) (33)
Carrying amount of liabilities related to discontinued hedging relationships $ 14,600 $ 16,600