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Investment Securities - Maturities of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Available for sale securities, fair value
Within 1 year	$ 6,465
After 1 year through 5 years	16,186
After 5 years through 10 years	15,710
After 10 years	23,947
Total	62,308	$ 82,994
Available for sale securities, amortized cost
Within 1 year	6,543
After 1 year through 5 years	17,192
After 5 years through 10 years	16,981
After 10 years	25,974
Amortized Cost	66,690
Held to maturity securities, fair value
Within 1 year	588
After 1 year through 5 years	19,789
After 5 years through 10 years	26,519
After 10 years	81,363
Total	128,259	132,605
Held to maturity securities, amortized cost
Within 1 year	592
After 1 year through 5 years	20,357
After 5 years through 10 years	27,439
After 10 years	88,305
Amortized Cost	136,693
Portfolio layer method fair value hedge basis adjustments, excluded from amortized cost of available for sale securities	8
U.S. agency mortgage-backed securities
Available for sale securities, fair value
Within 1 year	1,433
After 1 year through 5 years	7,445
After 5 years through 10 years	14,476
After 10 years	21,102
Total	44,456	51,833
Held to maturity securities, fair value
Within 1 year	588
After 1 year through 5 years	19,789
After 5 years through 10 years	26,519
After 10 years	81,363
Total	128,259	132,605
U.S. Treasury securities
Available for sale securities, fair value
Within 1 year	4,021
After 1 year through 5 years	3,765
After 5 years through 10 years	0
After 10 years	0
Total	7,786	14,469
Corporate debt securities
Available for sale securities, fair value
Within 1 year	877
After 1 year through 5 years	3,744
After 5 years through 10 years	470
After 10 years	0
Total	5,091	9,579
Asset-backed securities
Available for sale securities, fair value
Within 1 year	132
After 1 year through 5 years	1,001
After 5 years through 10 years	446
After 10 years	2,702
Total	4,281	5,910
U.S. state and municipal securities
Available for sale securities, fair value
Within 1 year	2
After 1 year through 5 years	231
After 5 years through 10 years	318
After 10 years	11
Total	562	549
Non-agency commercial mortgage-backed securities
Available for sale securities, fair value
Within 1 year	0
After 1 year through 5 years	0
After 5 years through 10 years	0
After 10 years	113
Total	113	109
Other
Available for sale securities, fair value
Within 1 year	0
After 1 year through 5 years	0
After 5 years through 10 years	0
After 10 years	19
Total	$ 19	$ 18

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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