Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 3,541
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	27,471
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	16,894
Available for Sale Securities, Amortized Cost, After 10 years	75,113
Securities available for sale debt securities, amortized cost	123,019	$ 84,172
Available-for-sale Securities, Fair value, 1 year or less	3,562
Available-for-sale Securities, Fair value, After 1 year through 5 years	27,856
Available-for-sale Securities, Fair value, After 5 years through 10 years	17,091
Available-for-sale Securities, Fair value, After 10 years	76,549
Available-for-sale securities, fair value	$ 125,058	87,358
Weighted-average yield, GAAP basis, available for sale securities	2.19%
Held to Maturity Securities, Amortized Cost, 1 year or less	$ 80
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	623
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	416
Held to Maturity Securities, Amortized Cost, After 10 years	366
Held to maturity securities, amortized cost	1,485	1,441
Held-to-maturity Securities, Fair Value, 1 year or less	81
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	651
Held-to-maturity Securities, Fair Value, After 5 years through 10 years	483
Held-to-maturity Securities, Fair Value, After 10 years	383
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	$ 1,598	$ 1,605
Weighted-average yield, GAAP basis, held to maturity securities	3.16%
1 Year or Less
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.42%
Weighted-average yield, GAAP basis, held to maturity securities	3.24%
After 1 Year through 5 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.25%
Weighted-average yield, GAAP basis, held to maturity securities	2.95%
After 5 Years through 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.60%
Weighted-average yield, GAAP basis, held to maturity securities	3.91%
After 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.49%
Weighted-average yield, GAAP basis, held to maturity securities	2.61%
U.S. Treasury and government agencies
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 2,751
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	22,506
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	11,358
Available for Sale Securities, Amortized Cost, After 10 years	1,949
Securities available for sale debt securities, amortized cost	38,564
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	318
Held to Maturity Securities, Amortized Cost, After 10 years	287
Held to maturity securities, amortized cost	804
Residential mortgage-backed \| Mortgage-backed Securities Agency
Debt Securities [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	123
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	2,124
Available for Sale Securities, Amortized Cost, After 10 years	64,145
Securities available for sale debt securities, amortized cost	66,393
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	1,079
Securities available for sale debt securities, amortized cost	1,081
Commercial mortgage-backed \| Mortgage-backed Securities Agency
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	64
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	520
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	804
Available for Sale Securities, Amortized Cost, After 10 years	875
Securities available for sale debt securities, amortized cost	2,263
Commercial mortgage-backed \| Mortgage-backed Securities Non-agency
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	174
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	210
Available for Sale Securities, Amortized Cost, After 10 years	3,649
Securities available for sale debt securities, amortized cost	4,033
Asset-backed
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	109
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,117
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	771
Available for Sale Securities, Amortized Cost, After 10 years	2,628
Securities available for sale debt securities, amortized cost	5,625
Other
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	616
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,031
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,625
Available for Sale Securities, Amortized Cost, After 10 years	788
Securities available for sale debt securities, amortized cost	5,060
Held to Maturity Securities, Amortized Cost, 1 year or less	80
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	424
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	98
Held to Maturity Securities, Amortized Cost, After 10 years	79
Held to maturity securities, amortized cost	$ 681

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

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