Investment Securities (Contractual Maturity of Debt Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 5,811
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	32,755
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	16,736
Available for Sale Securities, Amortized Cost, After 10 years	75,496
Securities available for sale debt securities, amortized cost	130,798
Available-for-sale Securities, Fair value, 1 year or less	5,851
Available-for-sale Securities, Fair value, After 1 year through 5 years	32,696
Available-for-sale Securities, Fair value, After 5 years through 10 years	16,788
Available-for-sale Securities, Fair Value, After 10 years	76,201
Available-for-sale Securities, Fair Value	$ 131,536	$ 87,358
Weighted-average yield, GAAP basis, available for sale securities	1.94%
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	$ 175
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	590
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	309
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	352
Held-to-maturity, debt securities	1,426	$ 1,441
Held-to-maturity Securities, Fair Value, 1 year or less	177
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	621
Held-to-maturity, Securities, Fair Value, After 5 through 10 years	357
Held-to-maturity, Securities, Fair Value, After 10 years	367
Debt Securities, Held-to-maturity, Fair Value	$ 1,522
Weighted-average yield, GAAP basis, held to maturity securities	3.17%
One Year or Less
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.40%
Weighted-average yield, GAAP basis, held to maturity securities	3.50%
After One Year Through Five Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.10%
Weighted-average yield, GAAP basis, held to maturity securities	2.96%
After Five Years Through Ten Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.67%
Weighted-average yield, GAAP basis, held to maturity securities	4.16%
After Ten Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.41%
Weighted-average yield, GAAP basis, held to maturity securities	2.52%
U.S. Treasury and government agencies
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 5,367
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	27,890
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	10,823
Available for Sale Securities, Amortized Cost, After 10 years	2,130
Securities available for sale debt securities, amortized cost	46,210
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	327
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	196
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	291
Held-to-maturity, debt securities	814
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	97
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	2,682
Available for Sale Securities, Amortized Cost, After 10 years	64,546
Securities available for sale debt securities, amortized cost	67,326
Residential mortgage-backed Securities \| Mortgage-backed Securities Non-agency
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	2
Available for Sale Securities, Amortized Cost, After 10 years	925
Securities available for sale debt securities, amortized cost	927
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	79
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	335
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	816
Available for Sale Securities, Amortized Cost, After 10 years	510
Securities available for sale debt securities, amortized cost	1,740
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	142
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	154
Available for Sale Securities, Amortized Cost, After 10 years	3,127
Securities available for sale debt securities, amortized cost	3,423
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	87
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,110
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	566
Available for Sale Securities, Amortized Cost, After 10 years	3,617
Securities available for sale debt securities, amortized cost	6,380
Other debt
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	277
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,181
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,693
Available for Sale Securities, Amortized Cost, After 10 years	641
Securities available for sale debt securities, amortized cost	4,792
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	175
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	263
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	113
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	61
Held-to-maturity, debt securities	$ 612

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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