v3.26.1
AFS Debt Securities, Contractual Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
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 $ 253,774 $ 215,700
Available-for-sale, amortized cost, net, remaining contractual maturity, due within one year 3,491  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after one year through five years 22,656  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after five years through ten years 68,199  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after ten years 159,428  
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Available-for-sale, at fair value 250,326 213,573
Available-for-sale, fair value, remaining contractual maturity, due within one year 3,489  
Available-for-sale, fair value, remaining contractual maturity, due after one year through five years 22,390  
Available-for-sale, fair value, remaining contractual maturity, due after five years through ten years 68,450  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 155,997  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 4.29%  
Available-for-sale, weighted average yield, remaining contractual maturity, due within one year 3.37%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after one year through five years 3.34%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after five years through ten years 4.14%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 4.50%  
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 $ (181) 75
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 81,100 51,738
Available-for-sale, amortized cost, net, remaining contractual maturity, due within one year 2,489  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after one year through five years 18,120  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after five years through ten years 59,700  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after ten years 791  
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Available-for-sale, at fair value 81,122  
Available-for-sale, fair value, remaining contractual maturity, due within one year 2,487  
Available-for-sale, fair value, remaining contractual maturity, due after one year through five years 17,961  
Available-for-sale, fair value, remaining contractual maturity, due after five years through ten years 59,930  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 744  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 3.95%  
Available-for-sale, weighted average yield, remaining contractual maturity, due within one year 3.63%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after one year through five years 3.37%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after five years through ten years 4.13%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 4.53%  
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 $ 10,741 10,706
Available-for-sale, amortized cost, net, remaining contractual maturity, due within one year 969  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after one year through five years 3,561  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after five years through ten years 2,459  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after ten years 3,752  
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Available-for-sale, at fair value 10,475 10,397
Available-for-sale, fair value, remaining contractual maturity, due within one year 966  
Available-for-sale, fair value, remaining contractual maturity, due after one year through five years 3,449  
Available-for-sale, fair value, remaining contractual maturity, due after five years through ten years 2,409  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 3,651  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 3.29%  
Available-for-sale, weighted average yield, remaining contractual maturity, due within one year 2.62%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after one year through five years 2.94%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after five years through ten years 3.43%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 3.70%  
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 $ 149,841 142,022
Available-for-sale, amortized cost, net, remaining contractual maturity, due within one year 1  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after one year through five years 749  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after five years through ten years 5,415  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after ten years 143,676  
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Available-for-sale, at fair value 146,572  
Available-for-sale, fair value, remaining contractual maturity, due within one year 1  
Available-for-sale, fair value, remaining contractual maturity, due after one year through five years 742  
Available-for-sale, fair value, remaining contractual maturity, due after five years through ten years 5,449  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 140,380  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 4.49%  
Available-for-sale, weighted average yield, remaining contractual maturity, due within one year 2.05%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after one year through five years 3.70%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after five years through ten years 4.51%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 4.50%  
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 $ 1,807 2,141
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 0  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after ten years 1,807  
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Available-for-sale, at fair value 1,802  
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 0  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 1,802  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 4.48%  
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 0.00%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 4.48%  
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 $ 9,793 7,895
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 414  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after ten years 9,379  
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Available-for-sale, at fair value 9,806 7,904
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 414  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 9,392  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 4.97%  
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 5.09%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 4.96%  
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 $ 492 $ 1,198
Available-for-sale, amortized cost, net, remaining contractual maturity, due within one year 32  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after one year through five years 226  
Available-for-sale, amortized cost, net, remaining contractual maturity, due after five years through ten years 211  
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 549  
Available-for-sale, fair value, remaining contractual maturity, due within one year 35  
Available-for-sale, fair value, remaining contractual maturity, due after one year through five years 238  
Available-for-sale, fair value, remaining contractual maturity, due after five years through ten years 248  
Available-for-sale, fair value, remaining contractual maturity, due after ten years $ 28  
Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract]    
Available-for-sale, weighted average yield 5.06%  
Available-for-sale, weighted average yield, remaining contractual maturity, due within one year 6.45%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after one year through five years 6.24%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after five years through ten years 4.08%  
Available-for-sale, weighted average yield, remaining contractual maturity, due after ten years 0.57%