Investment Securities (Contractual Maturity of Debt Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 873
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	14,228
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	15,633
Available for Sale Securities, Amortized Cost, After 10 years	34,764
Available-for-sale Securities, Amortized Cost	65,498	$ 45,353
Available-for-sale Securities, Fair value, 1 year or less	870
Available-for-sale Securities, Fair value, After 1 year through 5 years	14,074
Available-for-sale Securities, Fair value, After 5 years through 10 years	15,287
Available-for-sale Securities, Fair Value, After 10 years	31,808
Available-for-sale Securities, Fair Value	$ 62,039	41,785
Weighted-average yield, GAAP basis, available for sale securities	3.80%
Held-to-maturity Securities, Amortized Cost, 1 year or less	$ 8,515
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	20,870
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years	4,037
Held-to-maturity Securities, Amortized Cost, After 10 years	44,271
Held-to-maturity, Amortized costs	77,693	90,784
Held-to-maturity Securities, Fair Value, 1 year or less	8,448
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	20,271
Held-to-maturity, Securities, Fair Value, After 5 through 10 years	3,856
Held-to-maturity, Securities, Fair Value, After 10 years	40,483
Debt Securities, Held-to-maturity, Fair Value	$ 73,058	86,948
Weighted-average yield, GAAP basis, held to maturity securities	2.44%
One Year or Less
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.75%
Weighted-average yield, GAAP basis, held to maturity securities	1.36%
After One Year Through Five Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.69%
Weighted-average yield, GAAP basis, held to maturity securities	1.72%
After Five Years Through Ten Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	4.10%
Weighted-average yield, GAAP basis, held to maturity securities	3.05%
After Ten Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.73%
Weighted-average yield, GAAP basis, held to maturity securities	2.93%
U.S. Treasury and government agencies
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 512
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	10,325
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	10,849
Available for Sale Securities, Amortized Cost, After 10 years	2,276
Available-for-sale Securities, Amortized Cost	23,962	7,596
Available-for-sale Securities, Fair Value	23,551	6,951
Held-to-maturity Securities, Amortized Cost, 1 year or less	8,211
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	18,783
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years	1,563
Held-to-maturity Securities, Amortized Cost, After 10 years	863
Held-to-maturity, Amortized costs	29,420	36,529
Debt Securities, Held-to-maturity, Fair Value	28,524	35,397
Residential mortgage-backed Securities \| Mortgage-backed Securities Agency
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	4
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	226
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	3,627
Available for Sale Securities, Amortized Cost, After 10 years	29,732
Available-for-sale Securities, Amortized Cost	33,589
Held-to-maturity Securities, Amortized Cost, 1 year or less
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	7
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years	290
Held-to-maturity Securities, Amortized Cost, After 10 years	39,874
Held-to-maturity, Amortized costs	40,171
Residential mortgage-backed Securities \| Mortgage-backed Securities Non-agency
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less
Available for Sale Securities, Amortized Cost, After 1 year through 5 years
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	18
Available for Sale Securities, Amortized Cost, After 10 years	486
Available-for-sale Securities, Amortized Cost	504
Held-to-maturity Securities, Amortized Cost, 1 year or less
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years
Held-to-maturity Securities, Amortized Cost, After 10 years	240
Held-to-maturity, Amortized costs	240
Commercial Mortgage-Backed Securities \| Mortgage-backed Securities Agency
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	73
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,101
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	475
Available for Sale Securities, Amortized Cost, After 10 years	428
Available-for-sale Securities, Amortized Cost	2,077
Held-to-maturity Securities, Amortized Cost, 1 year or less
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	278
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years	469
Held-to-maturity Securities, Amortized Cost, After 10 years	208
Held-to-maturity, Amortized costs	955
Commercial Mortgage-Backed Securities \| Mortgage-backed Securities Non-agency
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	1
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	103
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	84
Available for Sale Securities, Amortized Cost, After 10 years	518
Available-for-sale Securities, Amortized Cost	706
Held-to-maturity Securities, Amortized Cost, 1 year or less
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	39
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years
Held-to-maturity Securities, Amortized Cost, After 10 years	797
Held-to-maturity, Amortized costs	836
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	850
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	319
Available for Sale Securities, Amortized Cost, After 10 years	1,184
Available-for-sale Securities, Amortized Cost	2,353
Held-to-maturity Securities, Amortized Cost, 1 year or less
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	967
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years	1,393
Held-to-maturity Securities, Amortized Cost, After 10 years	1,020
Held-to-maturity, Amortized costs	3,380
Other debt
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	283
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,623
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	261
Available for Sale Securities, Amortized Cost, After 10 years	140
Available-for-sale Securities, Amortized Cost	2,307	2,844
Available-for-sale Securities, Fair Value	2,231	2,727
Held-to-maturity Securities, Amortized Cost, 1 year or less	304
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	796
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years	322
Held-to-maturity Securities, Amortized Cost, After 10 years	1,269
Held-to-maturity, Amortized costs	2,691	3,108
Debt Securities, Held-to-maturity, Fair Value	$ 2,661	$ 3,123

Represents the weighted-average yield by maturity for debt securities available for sale.

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Represents the weighted-average yield by maturity for debt held to maturity.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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