Investment Securities (Contractual Maturity of Debt Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 2,018
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	16,701
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	10,964
Available for Sale Securities, Amortized Cost, After 10 years	54,489
Securities available for sale debt securities, amortized cost	84,172	$ 67,790
Available-for-sale Securities, Fair value, 1 year or less	2,038
Available-for-sale Securities, Fair value, After 1 year through 5 years	17,283
Available-for-sale Securities, Fair value, After 5 years through 10 years	11,443
Available-for-sale Securities, Fair Value, After 10 years	56,594
Available-for-sale Securities, Fair Value	$ 87,358	69,163
Weighted-average yield, GAAP basis, available for sale securities	2.45%
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	$ 34
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	621
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	421
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	365
Held-to-maturity, debt securities	1,441	17,661
Held-to-maturity Securities, Fair Value, 1 year or less	35
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	659
Held-to-maturity, Securities, Fair Value, After 5 through 10 years	507
Held-to-maturity, Securities, Fair Value, After 10 years	404
Debt Securities, Held-to-maturity, Fair Value	$ 1,605	$ 18,044
Weighted-average yield, GAAP basis, held to maturity securities	3.29%
One Year or Less
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.20%
Weighted-average yield, GAAP basis, held to maturity securities	3.75%
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	3.26%
After Five Years Through Ten Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.74%
Weighted-average yield, GAAP basis, held to maturity securities	3.93%
After Ten Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.80%
Weighted-average yield, GAAP basis, held to maturity securities	2.48%
U.S. Treasury and government agencies
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 1,149
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	11,973
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	5,418
Available for Sale Securities, Amortized Cost, After 10 years	1,281
Securities available for sale debt securities, amortized cost	19,821
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	199
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	312
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	284
Held-to-maturity, debt securities	795
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	205
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	2,384
Available for Sale Securities, Amortized Cost, After 10 years	44,765
Securities available for sale debt securities, amortized cost	47,355
Residential mortgage-backed Securities \| Mortgage-backed Securities Non-agency
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, After 10 years	1,272
Securities available for sale debt securities, amortized cost	1,272
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	13
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	563
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	679
Available for Sale Securities, Amortized Cost, After 10 years	1,316
Securities available for sale debt securities, amortized cost	2,571
Commercial Mortgage Backed Securities \| Mortgage-backed Securities Non-agency
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	83
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	236
Available for Sale Securities, Amortized Cost, After 10 years	3,359
Securities available for sale debt securities, amortized cost	3,678
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	67
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,375
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,029
Available for Sale Securities, Amortized Cost, After 10 years	1,589
Securities available for sale debt securities, amortized cost	5,060
Other debt
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	788
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,502
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,218
Available for Sale Securities, Amortized Cost, After 10 years	907
Securities available for sale debt securities, amortized cost	4,415
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	34
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	422
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	109
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	81
Held-to-maturity, debt securities	$ 646

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).

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