Investment Securities (Contractual Maturity of Debt Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 2,367
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	6,226
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	5,567
Available for Sale Securities, Amortized Cost, After 10 years	31,193
Available-for-sale Securities, Amortized Cost	45,353	$ 48,568
Available-for-sale Securities, Fair value, 1 year or less	2,309
Available-for-sale Securities, Fair value, After 1 year through 5 years	5,822
Available-for-sale Securities, Fair value, After 5 years through 10 years	5,265
Available-for-sale Securities, Fair Value, After 10 years	28,389
Available-for-sale Securities, Fair Value	$ 41,785	44,159
Weighted-average yield, GAAP basis, available for sale securities	2.88%
Held-to-maturity Securities, Amortized Cost, 1 year or less	$ 8,429
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	28,669
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years	5,379
Held-to-maturity Securities, Amortized Cost, After 10 years	48,307
Held-to-maturity, Amortized costs	90,784	95,175
Held-to-maturity Securities, Fair Value, 1 year or less	8,299
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	27,830
Held-to-maturity, Securities, Fair Value, After 5 through 10 years	5,232
Held-to-maturity, Securities, Fair Value, After 10 years	45,587
Debt Securities, Held-to-maturity, Fair Value	$ 86,948	90,279
Weighted-average yield, GAAP basis, held to maturity securities	2.37%
One Year or Less
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	0.99%
Weighted-average yield, GAAP basis, held to maturity securities	0.85%
After One Year Through Five Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.32%
Weighted-average yield, GAAP basis, held to maturity securities	1.55%
After Five Years Through Ten Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.94%
Weighted-average yield, GAAP basis, held to maturity securities	4.20%
After Ten Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.12%
Weighted-average yield, GAAP basis, held to maturity securities	2.92%
U.S. Treasury and government agencies
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 2,055
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,968
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	461
Available for Sale Securities, Amortized Cost, After 10 years	2,112
Available-for-sale Securities, Amortized Cost	7,596	9,196
Available-for-sale Securities, Fair Value	6,951	8,370
Held-to-maturity Securities, Amortized Cost, 1 year or less	8,177
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	25,744
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years	1,711
Held-to-maturity Securities, Amortized Cost, After 10 years	897
Held-to-maturity, Amortized costs	36,529	36,571
Debt Securities, Held-to-maturity, Fair Value	35,397	34,960
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	1
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	210
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	3,766
Available for Sale Securities, Amortized Cost, After 10 years	26,666
Available-for-sale Securities, Amortized Cost	30,643
Held-to-maturity Securities, Amortized Cost, 1 year or less
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	10
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years	329
Held-to-maturity Securities, Amortized Cost, After 10 years	42,347
Held-to-maturity, Amortized costs	42,686
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	12
Available for Sale Securities, Amortized Cost, After 10 years	573
Available-for-sale Securities, Amortized Cost	585
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	259
Held-to-maturity, Amortized costs	259
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	31
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	576
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	718
Available for Sale Securities, Amortized Cost, After 10 years	355
Available-for-sale Securities, Amortized Cost	1,680
Held-to-maturity Securities, Amortized Cost, 1 year or less
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	151
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years	518
Held-to-maturity Securities, Amortized Cost, After 10 years	270
Held-to-maturity, Amortized costs	939
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	106
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	118
Available for Sale Securities, Amortized Cost, After 10 years	688
Available-for-sale Securities, Amortized Cost	913
Held-to-maturity Securities, Amortized Cost, 1 year or less	29
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	50
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years
Held-to-maturity Securities, Amortized Cost, After 10 years	1,294
Held-to-maturity, Amortized costs	1,373
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	273
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	171
Available for Sale Securities, Amortized Cost, After 10 years	648
Available-for-sale Securities, Amortized Cost	1,092
Held-to-maturity Securities, Amortized Cost, 1 year or less	2
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	1,689
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years	2,269
Held-to-maturity Securities, Amortized Cost, After 10 years	1,930
Held-to-maturity, Amortized costs	5,890
Other debt
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	279
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,093
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	321
Available for Sale Securities, Amortized Cost, After 10 years	151
Available-for-sale Securities, Amortized Cost	2,844	3,288
Available-for-sale Securities, Fair Value	2,727	3,087
Held-to-maturity Securities, Amortized Cost, 1 year or less	221
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years	1,025
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years	552
Held-to-maturity Securities, Amortized Cost, After 10 years	1,310
Held-to-maturity, Amortized costs	3,108	3,354
Debt Securities, Held-to-maturity, Fair Value	$ 3,123	$ 3,307

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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