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Investment Securities - Investment Securities by Contractual Maturity (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Amortized Cost    
AFS securities: Amortized cost, total $ 110,695.0 $ 101,960.0
Amortized cost, unalloccated basis adjustment 2.2 (2.0)
HTM securities: Net carrying amount, total 55,205.0 61,071.0
Investment securities: amortized cost, total 165,900.0 163,031.0
Fair Value    
AFS securities: Fair value, total 108,327.0 98,608.0
HTM securities: Fair value, total 47,369.0 51,203.0
Investment securities $ 155,696.0 149,811.0
Annualized Average Yield    
AFS securities: Annualized average yield, total (as a percent) 3.60%  
HTM securities: Annualized average yield, total (as a percent) 2.20%  
Investment securities: Annualized average yield, total (as a percent) 3.10%  
AFS securities: Annualized average yield including the interest rate swap accrual of related hedges, due within 1 year (as a percent) 3.50%  
AFS securities: Annualized average yield including the interest rate swap accrual of related hedge (as a percent) 3.80%  
U.S. Treasury securities    
Amortized Cost    
AFS securities: Amortized cost, due within 1 year $ 21,899.0  
AFS securities: Amortized cost, after 1 year through 5 years 54,024.0  
AFS securities: Amortized cost, after 5 years through 10 years 2,304.0  
AFS securities: Amortized cost, after 10 years 0.0  
AFS securities: Amortized cost, total 78,227.0 70,160.0
HTM securities: Amortized cost, due within 1 year 6,669.0  
HTM securities: Amortized cost, after 1 year through 5 years 4,909.0  
HTM securities: Amortized cost, after 5 year through 10 years 502.0  
HTM securities: Amortized cost, after 10 years 1,554.0  
HTM securities: Net carrying amount, total 13,634.0 16,885.0
Fair Value    
AFS securities: Fair value, due within 1 year 21,888.0  
AFS securities: Fair value, after 1 year through 5 years 54,056.0  
AFS securities: Fair value, after 5 years through 10 years 2,301.0  
AFS securities: Fair value, after 10 years 0.0  
AFS securities: Fair value, total 78,245.0 69,834.0
HTM securities: Fair value, due within 1 year 6,620.0  
HTM securities: Fair value, after 1 year through 5 years 4,773.0  
HTM securities: Fair value, after 5 years through 10 years 438.0  
HTM securities: Fair value, after 10 years 1,088.0  
HTM securities: Fair value, total $ 12,919.0 15,803.0
Annualized Average Yield    
AFS securities: Annualized average yield, due within 1 year (as a percent) 3.20%  
AFS securities: Annualized average yield, after 1 year through 5 years (as a percent) 3.90%  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 4.10%  
AFS securities: Annualized average yield, after 10 years (as a percent) 0.00%  
HTM securities: Annualized average yield, due within 1 year (as a percent) 2.00%  
HTM securities: Annualized average yield, after 1 years through 5 years (as a percent) 2.50%  
HTM securities: Annualized average yield, after 5 years through 10 years (as a percent) 1.10%  
HTM securities: Annualized average yield, after 10 year (as a percent) 2.30%  
U.S. agency securities    
Amortized Cost    
AFS securities: Amortized cost, due within 1 year $ 18.0  
AFS securities: Amortized cost, after 1 year through 5 years 203.0  
AFS securities: Amortized cost, after 5 years through 10 years 434.0  
AFS securities: Amortized cost, after 10 years 23,714.0  
AFS securities: Amortized cost, total 24,369.0 24,113.0
HTM securities: Amortized cost, due within 1 year 0.0  
HTM securities: Amortized cost, after 1 year through 5 years 61.0  
HTM securities: Amortized cost, after 5 year through 10 years 121.0  
HTM securities: Amortized cost, after 10 years 38,942.0  
HTM securities: Net carrying amount, total 39,124.0 41,582.0
Fair Value    
AFS securities: Fair value, due within 1 year 17.0  
AFS securities: Fair value, after 1 year through 5 years 194.0  
AFS securities: Fair value, after 5 years through 10 years 402.0  
AFS securities: Fair value, after 10 years 21,698.0  
AFS securities: Fair value, total 22,311.0 21,467.0
HTM securities: Fair value, due within 1 year 0.0  
HTM securities: Fair value, after 1 year through 5 years 59.0  
HTM securities: Fair value, after 5 years through 10 years 116.0  
HTM securities: Fair value, after 10 years 31,936.0  
HTM securities: Fair value, total $ 32,111.0 32,994.0
Annualized Average Yield    
AFS securities: Annualized average yield, due within 1 year (as a percent) 0.20%  
AFS securities: Annualized average yield, after 1 year through 5 years (as a percent) 1.80%  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 1.60%  
AFS securities: Annualized average yield, after 10 years (as a percent) 3.60%  
HTM securities: Annualized average yield, due within 1 year (as a percent) 0.00%  
HTM securities: Annualized average yield, after 1 years through 5 years (as a percent) 2.00%  
HTM securities: Annualized average yield, after 5 years through 10 years (as a percent) 2.10%  
HTM securities: Annualized average yield, after 10 year (as a percent) 2.10%  
Agency CMBS    
Amortized Cost    
AFS securities: Amortized cost, due within 1 year $ 567.0  
AFS securities: Amortized cost, after 1 year through 5 years 3,747.0  
AFS securities: Amortized cost, after 5 years through 10 years 290.0  
AFS securities: Amortized cost, after 10 years 1,000.0  
AFS securities: Amortized cost, total 5,604.0 5,704.0
HTM securities: Amortized cost, due within 1 year 178.0  
HTM securities: Amortized cost, after 1 year through 5 years 464.0  
HTM securities: Amortized cost, after 5 year through 10 years 143.0  
HTM securities: Amortized cost, after 10 years 23.0  
HTM securities: Net carrying amount, total 808.0 1,154.0
Fair Value    
AFS securities: Fair value, due within 1 year 561.0  
AFS securities: Fair value, after 1 year through 5 years 3,642.0  
AFS securities: Fair value, after 5 years through 10 years 284.0  
AFS securities: Fair value, after 10 years 808.0  
AFS securities: Fair value, total 5,295.0 5,316.0
HTM securities: Fair value, due within 1 year 175.0  
HTM securities: Fair value, after 1 year through 5 years 443.0  
HTM securities: Fair value, after 5 years through 10 years 121.0  
HTM securities: Fair value, after 10 years 20.0  
HTM securities: Fair value, total $ 759.0 1,066.0
Annualized Average Yield    
AFS securities: Annualized average yield, due within 1 year (as a percent) 2.00%  
AFS securities: Annualized average yield, after 1 year through 5 years (as a percent) 1.90%  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 1.60%  
AFS securities: Annualized average yield, after 10 years (as a percent) 1.50%  
HTM securities: Annualized average yield, due within 1 year (as a percent) 0.90%  
HTM securities: Annualized average yield, after 1 years through 5 years (as a percent) 1.30%  
HTM securities: Annualized average yield, after 5 years through 10 years (as a percent) 1.60%  
HTM securities: Annualized average yield, after 10 year (as a percent) 1.30%  
State and municipal securities    
Amortized Cost    
AFS securities: Amortized cost, due within 1 year $ 77.0  
AFS securities: Amortized cost, after 1 year through 5 years 152.0  
AFS securities: Amortized cost, after 5 years through 10 years 113.0  
AFS securities: Amortized cost, after 10 years 1,651.0  
AFS securities: Amortized cost, total 1,993.0 1,373.0
Fair Value    
AFS securities: Fair value, due within 1 year 77.0  
AFS securities: Fair value, after 1 year through 5 years 151.0  
AFS securities: Fair value, after 5 years through 10 years 108.0  
AFS securities: Fair value, after 10 years 1,646.0  
AFS securities: Fair value, total $ 1,982.0 1,387.0
Annualized Average Yield    
AFS securities: Annualized average yield, due within 1 year (as a percent) 4.80%  
AFS securities: Annualized average yield, after 1 year through 5 years (as a percent) 4.50%  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 4.30%  
AFS securities: Annualized average yield, after 10 years (as a percent) 4.50%  
FFELP student loan ABS:    
Amortized Cost    
AFS securities: Amortized cost, due within 1 year $ 61.0  
AFS securities: Amortized cost, after 1 year through 5 years 48.0  
AFS securities: Amortized cost, after 5 years through 10 years 22.0  
AFS securities: Amortized cost, after 10 years 369.0  
AFS securities: Amortized cost, total 500.0 612.0
Fair Value    
AFS securities: Fair value, due within 1 year 59.0  
AFS securities: Fair value, after 1 year through 5 years 47.0  
AFS securities: Fair value, after 5 years through 10 years 22.0  
AFS securities: Fair value, after 10 years 366.0  
AFS securities: Fair value, total $ 494.0 604.0
Annualized Average Yield    
AFS securities: Annualized average yield, due within 1 year (as a percent) 5.50%  
AFS securities: Annualized average yield, after 1 year through 5 years (as a percent) 5.40%  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 5.30%  
AFS securities: Annualized average yield, after 10 years (as a percent) 5.40%  
Non-agency CMBS    
Amortized Cost    
HTM securities: Amortized cost, due within 1 year $ 127.0  
HTM securities: Amortized cost, after 1 year through 5 years 757.0  
HTM securities: Amortized cost, after 5 year through 10 years 373.0  
HTM securities: Amortized cost, after 10 years 382.0  
HTM securities: Net carrying amount, total 1,639.0 1,450.0
Fair Value    
HTM securities: Fair value, due within 1 year 121.0  
HTM securities: Fair value, after 1 year through 5 years 735.0  
HTM securities: Fair value, after 5 years through 10 years 344.0  
HTM securities: Fair value, after 10 years 380.0  
HTM securities: Fair value, total $ 1,580.0 $ 1,340.0
Annualized Average Yield    
HTM securities: Annualized average yield, due within 1 year (as a percent) 5.00%  
HTM securities: Annualized average yield, after 1 years through 5 years (as a percent) 4.60%  
HTM securities: Annualized average yield, after 5 years through 10 years (as a percent) 4.30%  
HTM securities: Annualized average yield, after 10 year (as a percent) 7.30%