Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 3,030
Available for sale securities, amortized cost, after 1 year through 5 years	29,571
Available for sale securities, amortized cost, after 5 years through 10 years	14,796
Available for sale securities, amortized cost, after 10 years	69,194
Securities available for sale debt securities, amortized cost	116,591
Available-for-sale securities, fair value, 1 year or less	3,037
Available-for-sale securities, fair value, after 1 year through 5 years	28,409
Available-for-sale securities, fair value, after 5 years through 10 years	14,188
Available-for-sale securities, fair value, after 10 years	66,679
Available-for-sale securities, fair value	$ 112,313	$ 131,536
Weighted-average yield, GAAP basis, available for sale securities	2.05%
Held to maturity securities, amortized cost, 1 year or less	$ 155
Held to maturity securities, amortized cost, after 1 year through 5 years	6,312
Held to maturity securities, amortized cost, after 5 years through 10 years	3,601
Held to maturity securities, amortized cost, after 10 years	10,030
Held to maturity securities, amortized cost	20,098	$ 1,426
Held-to-maturity securities, fair value, 1 year or less	157
Held-to-maturity securities, fair value, after 1 year through 5 years	6,318
Held-to-maturity securities, fair value, after 5 years through 10 years	3,624
Held-to-maturity securities, fair value, after 10 years	10,016
Held-to-maturity securities, fair value	$ 20,115
Weighted-average yield, GAAP basis, held to maturity securities	1.59%
1 Year or Less
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.81%
Weighted-average yield, GAAP basis, held to maturity securities	3.66%
After 1 Year through 5 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.23%
Weighted-average yield, GAAP basis, held to maturity securities	0.82%
After 5 Years through 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.89%
Weighted-average yield, GAAP basis, held to maturity securities	1.51%
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	2.07%
U.S. Treasury and government agencies
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 2,730
Available for sale securities, amortized cost, after 1 year through 5 years	24,432
Available for sale securities, amortized cost, after 5 years through 10 years	7,505
Available for sale securities, amortized cost, after 10 years	2,205
Securities available for sale debt securities, amortized cost	36,872
Held to maturity securities, amortized cost, after 1 year through 5 years	6,076
Held to maturity securities, amortized cost, after 5 years through 10 years	3,493
Held to maturity securities, amortized cost, after 10 years	422
Held to maturity securities, amortized cost	9,991
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	110
Available for sale securities, amortized cost, after 5 years through 10 years	3,034
Available for sale securities, amortized cost, after 10 years	58,261
Securities available for sale debt securities, amortized cost	61,407
Held to maturity securities, amortized cost, after 10 years	9,548
Held to maturity securities, amortized cost	9,548
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	1,130
Securities available for sale debt securities, amortized cost	1,132
Commercial mortgage-backed \| Mortgage-backed Securities Agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	45
Available for sale securities, amortized cost, after 1 year through 5 years	332
Available for sale securities, amortized cost, after 5 years through 10 years	1,359
Available for sale securities, amortized cost, after 10 years	416
Securities available for sale debt securities, amortized cost	2,152
Commercial mortgage-backed \| Mortgage-backed Securities Non-agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 1 year through 5 years	172
Available for sale securities, amortized cost, after 5 years through 10 years	242
Available for sale securities, amortized cost, after 10 years	3,090
Securities available for sale debt securities, amortized cost	3,504
Asset-backed
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	37
Available for sale securities, amortized cost, after 1 year through 5 years	1,803
Available for sale securities, amortized cost, after 5 years through 10 years	1,070
Available for sale securities, amortized cost, after 10 years	3,497
Securities available for sale debt securities, amortized cost	6,407
Other
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	216
Available for sale securities, amortized cost, after 1 year through 5 years	2,722
Available for sale securities, amortized cost, after 5 years through 10 years	1,584
Available for sale securities, amortized cost, after 10 years	595
Securities available for sale debt securities, amortized cost	5,117
Held to maturity securities, amortized cost, 1 year or less	155
Held to maturity securities, amortized cost, after 1 year through 5 years	236
Held to maturity securities, amortized cost, after 5 years through 10 years	108
Held to maturity securities, amortized cost, after 10 years	60
Held to maturity securities, amortized cost	$ 559

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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