Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 3,817
Available for sale securities, amortized cost, after 1 year through 5 years	29,606
Available for sale securities, amortized cost, after 5 years through 10 years	16,510
Available for sale securities, amortized cost, after 10 years	72,476
Securities available for sale debt securities, amortized cost	122,409	$ 84,172
Available-for-sale securities, fair value, 1 year or less	3,836
Available-for-sale securities, fair value, after 1 year through 5 years	29,919
Available-for-sale securities, fair value, after 5 years through 10 years	16,673
Available-for-sale securities, fair value, after 10 years	73,699
Available-for-sale securities, fair value	$ 124,127	87,358
Weighted-average yield, GAAP basis, available for sale securities	2.00%
Held to maturity securities, amortized cost, 1 year or less	$ 126
Held to maturity securities, amortized cost, after 1 year through 5 years	566
Held to maturity securities, amortized cost, after 5 years through 10 years	436
Held to maturity securities, amortized cost, after 10 years	351
Held to maturity securities, amortized cost	1,479	1,441
Held-to-maturity securities, fair value, 1 year or less	128
Held-to-maturity securities, fair value, after 1 year through 5 years	590
Held-to-maturity securities, fair value, after 5 years through 10 years	502
Held-to-maturity securities, fair value, after 10 years	363
Held-to-maturity securities, fair value	$ 1,583	$ 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	1.29%
Weighted-average yield, GAAP basis, held to maturity securities	3.47%
After 1 Year through 5 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.18%
Weighted-average yield, GAAP basis, held to maturity securities	2.91%
After 5 Years through 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.63%
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	2.45%
Weighted-average yield, GAAP basis, held to maturity securities	2.52%
U.S. Treasury and government agencies
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 3,326
Available for sale securities, amortized cost, after 1 year through 5 years	24,754
Available for sale securities, amortized cost, after 5 years through 10 years	10,796
Available for sale securities, amortized cost, after 10 years	1,752
Securities available for sale debt securities, amortized cost	40,628
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	321
Held to maturity securities, amortized cost, after 10 years	289
Held to maturity securities, amortized cost	809
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	108
Available for sale securities, amortized cost, after 5 years through 10 years	2,448
Available for sale securities, amortized cost, after 10 years	61,855
Securities available for sale debt securities, amortized cost	64,412
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	1,001
Securities available for sale debt securities, amortized cost	1,003
Commercial mortgage-backed \| Mortgage-backed Securities Agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	76
Available for sale securities, amortized cost, after 1 year through 5 years	413
Available for sale securities, amortized cost, after 5 years through 10 years	778
Available for sale securities, amortized cost, after 10 years	741
Securities available for sale debt securities, amortized cost	2,008
Commercial mortgage-backed \| Mortgage-backed Securities Non-agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 1 year through 5 years	147
Available for sale securities, amortized cost, after 5 years through 10 years	182
Available for sale securities, amortized cost, after 10 years	3,308
Securities available for sale debt securities, amortized cost	3,637
Asset-backed
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	97
Available for sale securities, amortized cost, after 1 year through 5 years	2,104
Available for sale securities, amortized cost, after 5 years through 10 years	711
Available for sale securities, amortized cost, after 10 years	3,087
Securities available for sale debt securities, amortized cost	5,999
Other
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	317
Available for sale securities, amortized cost, after 1 year through 5 years	2,080
Available for sale securities, amortized cost, after 5 years through 10 years	1,593
Available for sale securities, amortized cost, after 10 years	732
Securities available for sale debt securities, amortized cost	4,722
Held to maturity securities, amortized cost, 1 year or less	126
Held to maturity securities, amortized cost, after 1 year through 5 years	367
Held to maturity securities, amortized cost, after 5 years through 10 years	115
Held to maturity securities, amortized cost, after 10 years	62
Held to maturity securities, amortized cost	$ 670

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

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