v3.25.4
AFS Debt Securities, Contractual Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]    
Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments $ 215,700 $ 170,650
Available-for-sale, amortized cost, net, remaining contractual maturity, due within one year 3,199  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after one year through five years 12,382  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after five years through ten years 47,266  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after ten years 152,853  
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Available-for-sale, at fair value 213,573 162,978
Available-for-sale, fair value, remaining contractual maturity, due within one year 3,202  
Available-for-sale, fair value, remaining contractual maturity, due after one year through five years 12,160  
Available-for-sale, fair value, remaining contractual maturity, due after five years through ten years 47,498  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 150,713  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 4.31%  
Available-for-sale, weighted average yield, remaining contractual maturity, due within one year 2.92%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after one year through five years 2.64%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after five years through ten years 4.15%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 4.52%  
AFS and HTM Debt Securities Textual [Abstract]    
Debt securities, available-for-sale, maturity allocation [Extensible Enumeration] Debt Securities, Maturity Allocation, Contractual Maturity [Member]  
Fair value hedging [Member]    
AFS and HTM Debt Securities Textual [Abstract]    
Portfolio level basis adjustments $ 75 (43)
Securities of U.S. Treasury and federal agencies [Member]    
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]    
Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments 51,738 23,791
Available-for-sale, amortized cost, net, remaining contractual maturity, due within one year 1,337  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after one year through five years 8,890  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after five years through ten years 40,188  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after ten years 1,323  
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Available-for-sale, at fair value 51,809  
Available-for-sale, fair value, remaining contractual maturity, due within one year 1,337  
Available-for-sale, fair value, remaining contractual maturity, due after one year through five years 8,727  
Available-for-sale, fair value, remaining contractual maturity, due after five years through ten years 40,465  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 1,280  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 3.79%  
Available-for-sale, weighted average yield, remaining contractual maturity, due within one year 3.92%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after one year through five years 2.44%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after five years through ten years 4.16%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 1.44%  
Securities of U.S. states and political subdivisions [Member]    
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]    
Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments $ 10,706 12,542
Available-for-sale, amortized cost, net, remaining contractual maturity, due within one year 896  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after one year through five years 3,143  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after five years through ten years 2,721  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after ten years 3,946  
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Available-for-sale, at fair value 10,397 12,035
Available-for-sale, fair value, remaining contractual maturity, due within one year 895  
Available-for-sale, fair value, remaining contractual maturity, due after one year through five years 3,075  
Available-for-sale, fair value, remaining contractual maturity, due after five years through ten years 2,623  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 3,804  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 3.45%  
Available-for-sale, weighted average yield, remaining contractual maturity, due within one year 3.61%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after one year through five years 2.90%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after five years through ten years 3.57%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 3.76%  
Federal agency mortgage-backed securities [Member]    
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]    
Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments $ 142,022 129,703
Available-for-sale, amortized cost, net, remaining contractual maturity, due within one year 2  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after one year through five years 176  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after five years through ten years 3,938  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after ten years 137,906  
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Available-for-sale, at fair value 140,080  
Available-for-sale, fair value, remaining contractual maturity, due within one year 2  
Available-for-sale, fair value, remaining contractual maturity, due after one year through five years 176  
Available-for-sale, fair value, remaining contractual maturity, due after five years through ten years 3,948  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 135,954  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 4.54%  
Available-for-sale, weighted average yield, remaining contractual maturity, due within one year 2.02%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after one year through five years 4.05%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after five years through ten years 4.40%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 4.54%  
Non-agency mortgage-backed securities [Member]    
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]    
Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments $ 2,141 1,844
Available-for-sale, amortized cost, net, remaining contractual maturity, due within one year 0  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after one year through five years 0  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after five years through ten years 44  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after ten years 2,097  
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Available-for-sale, at fair value 2,126  
Available-for-sale, fair value, remaining contractual maturity, due within one year 0  
Available-for-sale, fair value, remaining contractual maturity, due after one year through five years 0  
Available-for-sale, fair value, remaining contractual maturity, due after five years through ten years 44  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 2,082  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 4.30%  
Available-for-sale, weighted average yield, remaining contractual maturity, due within one year 0.00%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after one year through five years 0.00%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after five years through ten years 4.30%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 4.30%  
Collateralized loan obligations [Member]    
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]    
Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments $ 7,895 2,196
Available-for-sale, amortized cost, net, remaining contractual maturity, due within one year 0  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after one year through five years 5  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after five years through ten years 332  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after ten years 7,558  
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Available-for-sale, at fair value 7,904 2,202
Available-for-sale, fair value, remaining contractual maturity, due within one year 0  
Available-for-sale, fair value, remaining contractual maturity, due after one year through five years 5  
Available-for-sale, fair value, remaining contractual maturity, due after five years through ten years 333  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 7,566  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 5.21%  
Available-for-sale, weighted average yield, remaining contractual maturity, due within one year 0.00%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after one year through five years 5.86%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after five years through ten years 5.45%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 5.20%  
Other debt securities [Member]    
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]    
Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments $ 1,198 $ 574
Available-for-sale, amortized cost, net, remaining contractual maturity, due within one year 964  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after one year through five years 168  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after five years through ten years 43  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after ten years 23  
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Available-for-sale, at fair value 1,257  
Available-for-sale, fair value, remaining contractual maturity, due within one year 968  
Available-for-sale, fair value, remaining contractual maturity, due after one year through five years 177  
Available-for-sale, fair value, remaining contractual maturity, due after five years through ten years 85  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 27  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 1.84%  
Available-for-sale, weighted average yield, remaining contractual maturity, due within one year 0.89%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after one year through five years 7.08%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after five years through ten years 3.26%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 0.56%