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Investment Securities - AFS and HTM Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
AFS securities    
AFS securities: Amortized cost, total $ 110,695.0 $ 101,960.0
Gross Unrealized Gains 131.0 89.0
Gross Unrealized Losses 2,499.0 3,441.0
Fair Value 108,327.0 98,608.0
Amortized cost, unalloccated basis adjustment 2.2 (2.0)
Gross unrealized gains, unallocated basis adjustment   2.0
Gross unrealized losses, unallocated basis adjustment 2.0 0.0
HTM securities    
HTM securities: Net carrying amount, total 55,205.0 61,071.0
Gross Unrealized Gains 70.0 7.0
Gross Unrealized Losses 7,906.0 9,875.0
Fair Value 47,369.0 51,203.0
Investment securities: amortized cost, total 165,900.0 163,031.0
Gross Unrealized Gains 201.0 96.0
Gross Unrealized Losses 10,405.0 13,316.0
Investment securities: fair value, total 155,696.0 149,811.0
U.S. Treasury securities    
AFS securities    
AFS securities: Amortized cost, total 78,227.0 70,160.0
Gross Unrealized Gains 103.0 62.0
Gross Unrealized Losses 85.0 388.0
Fair Value 78,245.0 69,834.0
HTM securities    
HTM securities: Net carrying amount, total 13,634.0 16,885.0
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 715.0 1,082.0
Fair Value 12,919.0 15,803.0
U.S. agency securities    
AFS securities    
AFS securities: Amortized cost, total 24,369.0 24,113.0
Gross Unrealized Gains 17.0 6.0
Gross Unrealized Losses 2,075.0 2,652.0
Fair Value 22,311.0 21,467.0
HTM securities    
HTM securities: Net carrying amount, total 39,124.0 41,582.0
Gross Unrealized Gains 59.0 4.0
Gross Unrealized Losses 7,072.0 8,592.0
Fair Value 32,111.0 32,994.0
Agency CMBS    
AFS securities    
AFS securities: Amortized cost, total 5,604.0 5,704.0
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 309.0 388.0
Fair Value 5,295.0 5,316.0
HTM securities    
HTM securities: Net carrying amount, total 808.0 1,154.0
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 49.0 88.0
Fair Value 759.0 1,066.0
State and municipal securities    
AFS securities    
AFS securities: Amortized cost, total 1,993.0 1,373.0
Gross Unrealized Gains 10.0 18.0
Gross Unrealized Losses 21.0 4.0
Fair Value 1,982.0 1,387.0
FFELP student loan ABS:    
AFS securities    
AFS securities: Amortized cost, total 500.0 612.0
Gross Unrealized Gains 1.0 1.0
Gross Unrealized Losses 7.0 9.0
Fair Value $ 494.0 $ 604.0
HTM securities    
Third party guarantees (as a percent) 95.00% 95.00%
Non-agency CMBS    
HTM securities    
HTM securities: Net carrying amount, total $ 1,639.0 $ 1,450.0
Gross Unrealized Gains 11.0 3.0
Gross Unrealized Losses 70.0 113.0
Fair Value $ 1,580.0 $ 1,340.0