Investment Securities (Contractual Maturity of Debt Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 2,317
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	5,872
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	7,456
Available for Sale Securities, Amortized Cost, After 10 years	32,923
Available-for-sale Securities, Amortized Cost	48,568	$ 130,798
Available-for-sale Securities, Fair value, 1 year or less	2,296
Available-for-sale Securities, Fair value, After 1 year through 5 years	5,505
Available-for-sale Securities, Fair value, After 5 years through 10 years	6,762
Available-for-sale Securities, Fair Value, After 10 years	29,596
Available-for-sale Securities, Fair Value	$ 44,159	131,536
Weighted-average yield, GAAP basis, available for sale securities	2.63%
Held-to-maturity Securitites, Amortized Cost, 1 year or less	$ 1,274
Held-to-maturity Securitites, Amortized Cost, After 1 year through 5 years	30,501
Held-to-maturity Securitites, Amortized Cost, After 5 years through 10 years	11,394
Held-to-maturity Securitites, Amortized Cost, After 10 years	52,006
Held-to-maturity, Amortized costs	95,175	1,426
Held-to-maturity Securities, Fair Value, 1 year or less	1,264
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	29,439
Held-to-maturity, Securities, Fair Value, After 5 through 10 years	10,799
Held-to-maturity, Securities, Fair Value, After 10 years	48,777
Debt Securities, Held-to-maturity, Fair Value	$ 90,279	$ 1,522
Weighted-average yield, GAAP basis, held to maturity securities	2.31%
One Year or Less
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.39%
Weighted-average yield, GAAP basis, held to maturity securities	2.31%
After One Year Through Five Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.81%
Weighted-average yield, GAAP basis, held to maturity securities	1.35%
After Five Years Through Ten Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.27%
Weighted-average yield, GAAP basis, held to maturity securities	2.41%
After Ten Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.87%
Weighted-average yield, GAAP basis, held to maturity securities	2.86%
U.S. Treasury and government agencies
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 2,121
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,958
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	2,101
Available for Sale Securities, Amortized Cost, After 10 years	2,016
Available-for-sale Securities, Amortized Cost	9,196
Held-to-maturity Securitites, Amortized Cost, 1 year or less	862
Held-to-maturity Securitites, Amortized Cost, After 1 year through 5 years	27,076
Held-to-maturity Securitites, Amortized Cost, After 5 years through 10 years	7,831
Held-to-maturity Securitites, Amortized Cost, After 10 years	802
Held-to-maturity, Amortized costs	36,571
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	2
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	75
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	3,304
Available for Sale Securities, Amortized Cost, After 10 years	28,733
Available-for-sale Securities, Amortized Cost	32,114
Held-to-maturity Securitites, Amortized Cost, 1 year or less
Held-to-maturity Securitites, Amortized Cost, After 1 year through 5 years	8
Held-to-maturity Securitites, Amortized Cost, After 5 years through 10 years	283
Held-to-maturity Securitites, Amortized Cost, After 10 years	44,980
Held-to-maturity, Amortized costs	45,271
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	7
Available for Sale Securities, Amortized Cost, After 10 years	690
Available-for-sale Securities, Amortized Cost	697
Held-to-maturity Securitites, Amortized Cost, 1 year or less
Held-to-maturity Securitites, Amortized Cost, After 1 year through 5 years
Held-to-maturity Securitites, Amortized Cost, After 5 years through 10 years
Held-to-maturity Securitites, Amortized Cost, After 10 years	276
Held-to-maturity, Amortized costs	276
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	66
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	410
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,075
Available for Sale Securities, Amortized Cost, After 10 years	294
Available-for-sale Securities, Amortized Cost	1,845
Held-to-maturity Securitites, Amortized Cost, 1 year or less
Held-to-maturity Securitites, Amortized Cost, After 1 year through 5 years
Held-to-maturity Securitites, Amortized Cost, After 5 years through 10 years	584
Held-to-maturity Securitites, Amortized Cost, After 10 years	264
Held-to-maturity, Amortized costs	848
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
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	120
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	264
Available for Sale Securities, Amortized Cost, After 10 years	941
Available-for-sale Securities, Amortized Cost	1,325
Held-to-maturity Securitites, Amortized Cost, 1 year or less
Held-to-maturity Securitites, Amortized Cost, After 1 year through 5 years	114
Held-to-maturity Securitites, Amortized Cost, After 5 years through 10 years
Held-to-maturity Securitites, Amortized Cost, After 10 years	1,553
Held-to-maturity, Amortized costs	1,667
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
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	10
Available for Sale Securities, Amortized Cost, After 10 years	93
Available-for-sale Securities, Amortized Cost	103
Held-to-maturity Securitites, Amortized Cost, 1 year or less	253
Held-to-maturity Securitites, Amortized Cost, After 1 year through 5 years	2,134
Held-to-maturity Securitites, Amortized Cost, After 5 years through 10 years	2,117
Held-to-maturity Securitites, Amortized Cost, After 10 years	2,684
Held-to-maturity, Amortized costs	7,188
Other debt
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	128
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,309
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	695
Available for Sale Securities, Amortized Cost, After 10 years	156
Available-for-sale Securities, Amortized Cost	3,288
Held-to-maturity Securitites, Amortized Cost, 1 year or less	159
Held-to-maturity Securitites, Amortized Cost, After 1 year through 5 years	1,169
Held-to-maturity Securitites, Amortized Cost, After 5 years through 10 years	579
Held-to-maturity Securitites, Amortized Cost, After 10 years	1,447
Held-to-maturity, Amortized costs	$ 3,354

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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