v3.26.1
Investment Securities - Investment Securities by Contractual Maturity (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Amortized Cost    
AFS securities: Amortized cost, total $ 107,761.0 $ 112,522.0
Amortized cost, unalloccated basis adjustment (1.1) 2.0
HTM securities: Net carrying amount, total 47,747.0 53,090.0
Investment securities: amortized cost, total 155,508.0 165,612.0
Fair Value    
AFS securities: Fair value, total 105,532.0 110,466.0
HTM securities: Fair value, total 40,238.0 45,615.0
Investment securities $ 145,770.0 156,081.0
Annualized Average Yield    
AFS securities: Annualized average yield, total (as a percent) 3.70%  
HTM securities: Annualized average yield, total (as a percent) 2.30%  
Investment securities: Annualized average yield, total (as a percent) 3.30%  
AFS securities: Annualized average yield including the interest rate swap accrual of related hedges, due within 1 year (as a percent) 3.90%  
AFS securities: Annualized average yield including the interest rate swap accrual of related hedge (as a percent) 3.70%  
U.S. Treasury securities    
Amortized Cost    
AFS securities: Amortized cost, due within 1 year $ 32,554.0  
AFS securities: Amortized cost, after 1 year through 5 years 43,438.0  
AFS securities: Amortized cost, after 5 years through 10 years 74.0  
AFS securities: Amortized cost, total 76,066.0 80,745.0
HTM securities: Amortized cost, due within 1 year 1,651.0  
HTM securities: Amortized cost, after 1 year through 5 years 5,252.0  
HTM securities: Amortized cost, after 10 years 1,552.0  
HTM securities: Net carrying amount, total 8,455.0 12,299.0
Fair Value    
AFS securities: Fair value, due within 1 year 32,536.0  
AFS securities: Fair value, after 1 year through 5 years 43,415.0  
AFS securities: Fair value, after 5 years through 10 years 75.0  
AFS securities: Fair value, total 76,026.0 80,907.0
HTM securities: Fair value, due within 1 year 1,630.0  
HTM securities: Fair value, after 1 year through 5 years 5,050.0  
HTM securities: Fair value, after 10 years 1,071.0  
HTM securities: Fair value, total $ 7,751.0 11,636.0
Annualized Average Yield    
AFS securities: Annualized average yield, due within 1 year (as a percent) 4.00%  
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) 4.20%  
HTM securities: Annualized average yield, due within 1 year (as a percent) 2.20%  
HTM securities: Annualized average yield, after 1 years through 5 years (as a percent) 2.70%  
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 $ 7.0  
AFS securities: Amortized cost, after 1 year through 5 years 254.0  
AFS securities: Amortized cost, after 5 years through 10 years 253.0  
AFS securities: Amortized cost, after 10 years 23,617.0  
AFS securities: Amortized cost, total 24,131.0 24,031.0
HTM securities: Amortized cost, after 1 year through 5 years 127.0  
HTM securities: Amortized cost, after 5 year through 10 years 13.0  
HTM securities: Amortized cost, after 10 years 36,598.0  
HTM securities: Net carrying amount, total 36,738.0 38,303.0
Fair Value    
AFS securities: Fair value, due within 1 year 8.0  
AFS securities: Fair value, after 1 year through 5 years 240.0  
AFS securities: Fair value, after 5 years through 10 years 229.0  
AFS securities: Fair value, after 10 years 21,727.0  
AFS securities: Fair value, total 22,204.0 22,112.0
HTM securities: Fair value, after 1 year through 5 years 121.0  
HTM securities: Fair value, after 5 years through 10 years 12.0  
HTM securities: Fair value, after 10 years 29,848.0  
HTM securities: Fair value, total $ 29,981.0 31,585.0
Annualized Average Yield    
AFS securities: Annualized average yield, due within 1 year (as a percent) 1.40%  
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) 1.50%  
AFS securities: Annualized average yield, after 10 years (as a percent) 3.30%  
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) 2.40%  
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 $ 305.0  
AFS securities: Amortized cost, after 1 year through 5 years 3,612.0  
AFS securities: Amortized cost, after 5 years through 10 years 174.0  
AFS securities: Amortized cost, after 10 years 915.0  
AFS securities: Amortized cost, total 5,006.0 5,504.0
HTM securities: Amortized cost, due within 1 year 282.0  
HTM securities: Amortized cost, after 1 year through 5 years 193.0  
HTM securities: Amortized cost, after 5 year through 10 years 91.0  
HTM securities: Amortized cost, after 10 years 23.0  
HTM securities: Net carrying amount, total 589.0 709.0
Fair Value    
AFS securities: Fair value, due within 1 year 303.0  
AFS securities: Fair value, after 1 year through 5 years 3,536.0  
AFS securities: Fair value, after 5 years through 10 years 170.0  
AFS securities: Fair value, after 10 years 728.0  
AFS securities: Fair value, total 4,737.0 5,219.0
HTM securities: Fair value, due within 1 year 278.0  
HTM securities: Fair value, after 1 year through 5 years 180.0  
HTM securities: Fair value, after 5 years through 10 years 75.0  
HTM securities: Fair value, after 10 years 18.0  
HTM securities: Fair value, total $ 551.0 666.0
Annualized Average Yield    
AFS securities: Annualized average yield, due within 1 year (as a percent) 2.20%  
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) 1.60%  
HTM securities: Annualized average yield, due within 1 year (as a percent) 1.40%  
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) 1.50%  
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 $ 722.0  
AFS securities: Amortized cost, after 1 year through 5 years 126.0  
AFS securities: Amortized cost, after 5 years through 10 years 312.0  
AFS securities: Amortized cost, after 10 years 982.0  
AFS securities: Amortized cost, total 2,142.0 1,754.0
Fair Value    
AFS securities: Fair value, due within 1 year 723.0  
AFS securities: Fair value, after 1 year through 5 years 123.0  
AFS securities: Fair value, after 5 years through 10 years 314.0  
AFS securities: Fair value, after 10 years 993.0  
AFS securities: Fair value, total $ 2,153.0 1,747.0
Annualized Average Yield    
AFS securities: Annualized average yield, due within 1 year (as a percent) 4.30%  
AFS securities: Annualized average yield, after 1 year through 5 years (as a percent) 4.80%  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 4.60%  
AFS securities: Annualized average yield, after 10 years (as a percent) 4.60%  
FFELP student loan ABS:    
Amortized Cost    
AFS securities: Amortized cost, due within 1 year $ 54.0  
AFS securities: Amortized cost, after 1 year through 5 years 63.0  
AFS securities: Amortized cost, after 5 years through 10 years 4.0  
AFS securities: Amortized cost, after 10 years 296.0  
AFS securities: Amortized cost, total 417.0 486.0
Fair Value    
AFS securities: Fair value, due within 1 year 52.0  
AFS securities: Fair value, after 1 year through 5 years 61.0  
AFS securities: Fair value, after 5 years through 10 years 4.0  
AFS securities: Fair value, after 10 years 295.0  
AFS securities: Fair value, total $ 412.0 481.0
Annualized Average Yield    
AFS securities: Annualized average yield, due within 1 year (as a percent) 4.70%  
AFS securities: Annualized average yield, after 1 year through 5 years (as a percent) 4.60%  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 0.90%  
AFS securities: Annualized average yield, after 10 years (as a percent) 4.70%  
Non-agency mortgage-backed securities    
Amortized Cost    
HTM securities: Amortized cost, due within 1 year $ 208.0  
HTM securities: Amortized cost, after 1 year through 5 years 814.0  
HTM securities: Amortized cost, after 5 year through 10 years 301.0  
HTM securities: Amortized cost, after 10 years 642.0  
HTM securities: Net carrying amount, total 1,965.0 1,779.0
Fair Value    
HTM securities: Fair value, due within 1 year 224.0  
HTM securities: Fair value, after 1 year through 5 years 803.0  
HTM securities: Fair value, after 5 years through 10 years 289.0  
HTM securities: Fair value, after 10 years 639.0  
HTM securities: Fair value, total $ 1,955.0 $ 1,728.0
Annualized Average Yield    
HTM securities: Annualized average yield, due within 1 year (as a percent) 4.50%  
HTM securities: Annualized average yield, after 1 years through 5 years (as a percent) 4.30%  
HTM securities: Annualized average yield, after 5 years through 10 years (as a percent) 5.10%  
HTM securities: Annualized average yield, after 10 year (as a percent) 6.50%