v3.26.1
Investment Securities - Investment Securities by Contractual Maturity (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Amortized Cost    
AFS securities: Amortized cost, total $ 112,050.0 $ 112,522.0
Amortized cost, unalloccated basis adjustment 0.3 2.0
HTM securities: Net carrying amount, total 50,546.0 53,090.0
Investment securities: amortized cost, total 162,596.0 165,612.0
Fair Value    
AFS securities: Fair value, total 109,817.0 110,466.0
HTM securities: Fair value, total 42,993.0 45,615.0
Investment securities $ 152,810.0 156,081.0
Annualized Average Yield    
AFS securities: Annualized average yield, total (as a percent) 3.60%  
HTM securities: Annualized average yield, total (as a percent) 2.30%  
Investment securities: Annualized average yield, total (as a percent) 3.20%  
AFS securities: Annualized average yield including the interest rate swap accrual of related hedges, due within 1 year (as a percent) 3.80%  
AFS securities: Annualized average yield including the interest rate swap accrual of related hedge (as a percent) 3.60%  
U.S. Treasury securities    
Amortized Cost    
AFS securities: Amortized cost, due within 1 year $ 31,053.0  
AFS securities: Amortized cost, after 1 year through 5 years 49,308.0  
AFS securities: Amortized cost, after 5 years through 10 years 363.0  
AFS securities: Amortized cost, total 80,724.0 80,745.0
HTM securities: Amortized cost, due within 1 year 3,045.0  
HTM securities: Amortized cost, after 1 year through 5 years 5,656.0  
HTM securities: Amortized cost, after 5 year through 10 years 203.0  
HTM securities: Amortized cost, after 10 years 1,553.0  
HTM securities: Net carrying amount, total 10,457.0 12,299.0
Fair Value    
AFS securities: Fair value, due within 1 year 31,084.0  
AFS securities: Fair value, after 1 year through 5 years 49,291.0  
AFS securities: Fair value, after 5 years through 10 years 363.0  
AFS securities: Fair value, total 80,738.0 80,907.0
HTM securities: Fair value, due within 1 year 3,033.0  
HTM securities: Fair value, after 1 year through 5 years 5,489.0  
HTM securities: Fair value, after 5 years through 10 years 178.0  
HTM securities: Fair value, after 10 years 1,068.0  
HTM securities: Fair value, total $ 9,768.0 11,636.0
Annualized Average Yield    
AFS securities: Annualized average yield, due within 1 year (as a percent) 3.90%  
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) 4.00%  
HTM securities: Annualized average yield, due within 1 year (as a percent) 2.30%  
HTM securities: Annualized average yield, after 1 years through 5 years (as a percent) 2.60%  
HTM securities: Annualized average yield, after 5 years through 10 years (as a percent) 1.30%  
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 $ 9.0  
AFS securities: Amortized cost, after 1 year through 5 years 200.0  
AFS securities: Amortized cost, after 5 years through 10 years 333.0  
AFS securities: Amortized cost, after 10 years 23,480.0  
AFS securities: Amortized cost, total 24,022.0 24,031.0
HTM securities: Amortized cost, after 1 year through 5 years 141.0  
HTM securities: Amortized cost, after 5 year through 10 years 13.0  
HTM securities: Amortized cost, after 10 years 37,448.0  
HTM securities: Net carrying amount, total 37,602.0 38,303.0
Fair Value    
AFS securities: Fair value, due within 1 year 9.0  
AFS securities: Fair value, after 1 year through 5 years 190.0  
AFS securities: Fair value, after 5 years through 10 years 308.0  
AFS securities: Fair value, after 10 years 21,573.0  
AFS securities: Fair value, total 22,080.0 22,112.0
HTM securities: Fair value, after 1 year through 5 years 135.0  
HTM securities: Fair value, after 5 years through 10 years 13.0  
HTM securities: Fair value, after 10 years 30,694.0  
HTM securities: Fair value, total $ 30,842.0 31,585.0
Annualized Average Yield    
AFS securities: Annualized average yield, due within 1 year (as a percent) 1.50%  
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) 3.20%  
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 $ 538.0  
AFS securities: Amortized cost, after 1 year through 5 years 3,673.0  
AFS securities: Amortized cost, after 5 years through 10 years 176.0  
AFS securities: Amortized cost, after 10 years 939.0  
AFS securities: Amortized cost, total 5,326.0 5,504.0
HTM securities: Amortized cost, due within 1 year 167.0  
HTM securities: Amortized cost, after 1 year through 5 years 310.0  
HTM securities: Amortized cost, after 5 year through 10 years 119.0  
HTM securities: Amortized cost, after 10 years 23.0  
HTM securities: Net carrying amount, total 619.0 709.0
Fair Value    
AFS securities: Fair value, due within 1 year 534.0  
AFS securities: Fair value, after 1 year through 5 years 3,594.0  
AFS securities: Fair value, after 5 years through 10 years 172.0  
AFS securities: Fair value, after 10 years 751.0  
AFS securities: Fair value, total 5,051.0 5,219.0
HTM securities: Fair value, due within 1 year 164.0  
HTM securities: Fair value, after 1 year through 5 years 295.0  
HTM securities: Fair value, after 5 years through 10 years 100.0  
HTM securities: Fair value, after 10 years 19.0  
HTM securities: Fair value, total $ 578.0 666.0
Annualized Average Yield    
AFS securities: Annualized average yield, due within 1 year (as a percent) 2.10%  
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) 1.50%  
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) 1.20%  
HTM securities: Annualized average yield, after 1 years through 5 years (as a percent) 1.40%  
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 $ 81.0  
AFS securities: Amortized cost, after 1 year through 5 years 228.0  
AFS securities: Amortized cost, after 5 years through 10 years 160.0  
AFS securities: Amortized cost, after 10 years 1,066.0  
AFS securities: Amortized cost, total 1,535.0 1,754.0
Fair Value    
AFS securities: Fair value, due within 1 year 81.0  
AFS securities: Fair value, after 1 year through 5 years 225.0  
AFS securities: Fair value, after 5 years through 10 years 158.0  
AFS securities: Fair value, after 10 years 1,047.0  
AFS securities: Fair value, total $ 1,511.0 1,747.0
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) 3.60%  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 4.50%  
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 $ 57.0  
AFS securities: Amortized cost, after 1 year through 5 years 46.0  
AFS securities: Amortized cost, after 5 years through 10 years 24.0  
AFS securities: Amortized cost, after 10 years 316.0  
AFS securities: Amortized cost, total 443.0 486.0
Fair Value    
AFS securities: Fair value, due within 1 year 55.0  
AFS securities: Fair value, after 1 year through 5 years 44.0  
AFS securities: Fair value, after 5 years through 10 years 24.0  
AFS securities: Fair value, after 10 years 314.0  
AFS securities: Fair value, total $ 437.0 481.0
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) 4.70%  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 3.90%  
AFS securities: Annualized average yield, after 10 years (as a percent) 4.80%  
Non-agency CMBS    
Amortized Cost    
HTM securities: Amortized cost, due within 1 year $ 128.0  
HTM securities: Amortized cost, after 1 year through 5 years 871.0  
HTM securities: Amortized cost, after 5 year through 10 years 312.0  
HTM securities: Amortized cost, after 10 years 557.0  
HTM securities: Net carrying amount, total 1,868.0 1,779.0
Fair Value    
HTM securities: Fair value, due within 1 year 127.0  
HTM securities: Fair value, after 1 year through 5 years 841.0  
HTM securities: Fair value, after 5 years through 10 years 288.0  
HTM securities: Fair value, after 10 years 549.0  
HTM securities: Fair value, total $ 1,805.0 $ 1,728.0
Annualized Average Yield    
HTM securities: Annualized average yield, due within 1 year (as a percent) 4.80%  
HTM securities: Annualized average yield, after 1 years through 5 years (as a percent) 4.40%  
HTM securities: Annualized average yield, after 5 years through 10 years (as a percent) 4.60%  
HTM securities: Annualized average yield, after 10 year (as a percent) 6.80%