Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 2,995
Available for sale securities, amortized cost, after 1 year through 5 years	8,411
Available for sale securities, amortized cost, after 5 years through 10 years	8,741
Available for sale securities, amortized cost, after 10 years	35,828
Securities available for sale debt securities, amortized cost	55,975	$ 130,798
Available-for-sale securities, fair value, 1 year or less	2,988
Available-for-sale securities, fair value, after 1 year through 5 years	8,056
Available-for-sale securities, fair value, after 5 years through 10 years	8,209
Available-for-sale securities, fair value, after 10 years	33,731
Available-for-sale securities, fair value	$ 52,984	131,536
Weighted-average yield, GAAP basis, available for sale securities	2.40%
Held to maturity securities, amortized cost, 1 year or less	$ 672
Held to maturity securities, amortized cost, after 1 year through 5 years	26,158
Held to maturity securities, amortized cost, after 5 years through 10 years	9,782
Held to maturity securities, amortized cost, after 10 years	43,136
Held to maturity securities, amortized cost	79,748	$ 1,426
Held-to-maturity securities, fair value, 1 year or less	671
Held-to-maturity securities, fair value, after 1 year through 5 years	25,964
Held-to-maturity securities, fair value, after 5 years through 10 years	9,603
Held-to-maturity securities, fair value, after 10 years	42,176
Held-to-maturity securities, fair value	$ 78,414
Weighted-average yield, GAAP basis, held to maturity securities	1.87%
1 Year or Less
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.01%
Weighted-average yield, GAAP basis, held to maturity securities	1.08%
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	1.10%
After 5 Years through 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.16%
Weighted-average yield, GAAP basis, held to maturity securities	1.76%
After 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.68%
Weighted-average yield, GAAP basis, held to maturity securities	2.38%
U.S. Treasury and government agencies
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 2,783
Available for sale securities, amortized cost, after 1 year through 5 years	5,835
Available for sale securities, amortized cost, after 5 years through 10 years	3,124
Available for sale securities, amortized cost, after 10 years	2,135
Securities available for sale debt securities, amortized cost	13,877
Held to maturity securities, amortized cost, 1 year or less	474
Held to maturity securities, amortized cost, after 1 year through 5 years	23,231
Held to maturity securities, amortized cost, after 5 years through 10 years	7,484
Held to maturity securities, amortized cost, after 10 years	393
Held to maturity securities, amortized cost	31,582
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	83
Available for sale securities, amortized cost, after 5 years through 10 years	3,046
Available for sale securities, amortized cost, after 10 years	31,109
Securities available for sale debt securities, amortized cost	34,240
Held to maturity securities, amortized cost, after 1 year through 5 years	12
Held to maturity securities, amortized cost, after 5 years through 10 years	34
Held to maturity securities, amortized cost, after 10 years	36,834
Held to maturity securities, amortized cost	36,880
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	760
Securities available for sale debt securities, amortized cost	762
Held to maturity securities, amortized cost, after 10 years	288
Held to maturity securities, amortized cost	288
Commercial mortgage-backed \| Mortgage-backed Securities Agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	62
Available for sale securities, amortized cost, after 1 year through 5 years	243
Available for sale securities, amortized cost, after 5 years through 10 years	1,363
Available for sale securities, amortized cost, after 10 years	372
Securities available for sale debt securities, amortized cost	2,040
Held to maturity securities, amortized cost, after 5 years through 10 years	86
Held to maturity securities, amortized cost	86
Commercial mortgage-backed \| Mortgage-backed Securities Non-agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 1 year through 5 years	7
Available for sale securities, amortized cost, after 5 years through 10 years	224
Available for sale securities, amortized cost, after 10 years	1,165
Securities available for sale debt securities, amortized cost	1,396
Held to maturity securities, amortized cost, after 1 year through 5 years	137
Held to maturity securities, amortized cost, after 5 years through 10 years	8
Held to maturity securities, amortized cost, after 10 years	1,697
Held to maturity securities, amortized cost	1,842
Asset-backed
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 5 years through 10 years	11
Available for sale securities, amortized cost, after 10 years	101
Securities available for sale debt securities, amortized cost	112
Held to maturity securities, amortized cost, 1 year or less	16
Held to maturity securities, amortized cost, after 1 year through 5 years	1,872
Held to maturity securities, amortized cost, after 5 years through 10 years	1,609
Held to maturity securities, amortized cost, after 10 years	3,193
Held to maturity securities, amortized cost	6,690
Other
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	148
Available for sale securities, amortized cost, after 1 year through 5 years	2,243
Available for sale securities, amortized cost, after 5 years through 10 years	971
Available for sale securities, amortized cost, after 10 years	186
Securities available for sale debt securities, amortized cost	3,548
Held to maturity securities, amortized cost, 1 year or less	182
Held to maturity securities, amortized cost, after 1 year through 5 years	906
Held to maturity securities, amortized cost, after 5 years through 10 years	561
Held to maturity securities, amortized cost, after 10 years	731
Held to maturity securities, amortized cost	$ 2,380

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), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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