Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 3,506
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	20,264
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	12,305
Available for Sale Securities, Amortized Cost, After 10 years	58,731
Securities available for sale debt securities, amortized cost	94,806	$ 84,172
Available-for-sale Securities, Fair value, 1 year or less	3,529
Available-for-sale Securities, Fair value, After 1 year through 5 years	20,700
Available-for-sale Securities, Fair value, After 5 years through 10 years	12,405
Available-for-sale Securities, Fair value, After 10 years	60,165
Available-for-sale securities, fair value	$ 96,799	87,358
Weighted-average yield, GAAP basis, available for sale securities	2.25%
Held to Maturity Securities, Amortized Cost, 1 year or less	$ 71
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	595
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	424
Held to Maturity Securities, Amortized Cost, After 10 years	366
Held to maturity securities, amortized cost	1,456	1,441
Held-to-maturity Securities, Fair Value, 1 year or less	72
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	626
Held-to-maturity Securities, Fair Value, After 5 years through 10 years	490
Held-to-maturity Securities, Fair Value, After 10 years	371
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	$ 1,559	$ 1,605
Weighted-average yield, GAAP basis, held to maturity securities	3.28%
1 Year or Less
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.68%
Weighted-average yield, GAAP basis, held to maturity securities	3.70%
After 1 Year through 5 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.58%
Weighted-average yield, GAAP basis, held to maturity securities	3.21%
After 5 Years through 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.72%
Weighted-average yield, GAAP basis, held to maturity securities	3.93%
After 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.62%
Weighted-average yield, GAAP basis, held to maturity securities	2.48%
U.S. Treasury and government agencies
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 2,685
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	15,164
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	6,237
Available for Sale Securities, Amortized Cost, After 10 years	1,584
Securities available for sale debt securities, amortized cost	25,670
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	199
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	315
Held to Maturity Securities, Amortized Cost, After 10 years	286
Held to maturity securities, amortized cost	800
Residential mortgage-backed \| Mortgage-backed Securities Agency
Debt Securities [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	205
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	2,248
Available for Sale Securities, Amortized Cost, After 10 years	48,044
Securities available for sale debt securities, amortized cost	50,499
Residential mortgage-backed \| Mortgage-backed Securities Non-agency
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	2
Available for Sale Securities, Amortized Cost, After 10 years	1,179
Securities available for sale debt securities, amortized cost	1,181
Commercial mortgage-backed \| Mortgage-backed Securities Agency
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	545
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	662
Available for Sale Securities, Amortized Cost, After 10 years	1,012
Securities available for sale debt securities, amortized cost	2,219
Commercial mortgage-backed \| Mortgage-backed Securities Non-agency
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	202
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	210
Available for Sale Securities, Amortized Cost, After 10 years	3,779
Securities available for sale debt securities, amortized cost	4,191
Asset-backed
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	86
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,322
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,274
Available for Sale Securities, Amortized Cost, After 10 years	2,287
Securities available for sale debt securities, amortized cost	5,969
Other
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	733
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,826
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,672
Available for Sale Securities, Amortized Cost, After 10 years	846
Securities available for sale debt securities, amortized cost	5,077
Held to Maturity Securities, Amortized Cost, 1 year or less	71
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	396
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	109
Held to Maturity Securities, Amortized Cost, After 10 years	80
Held to maturity securities, amortized cost	$ 656

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

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