Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 3,881
Available for sale securities, amortized cost, after 1 year through 5 years	6,032
Available for sale securities, amortized cost, after 5 years through 10 years	7,444
Available for sale securities, amortized cost, after 10 years	33,232
Securities available for sale debt securities, amortized cost	50,589	$ 130,798
Available-for-sale securities, fair value, 1 year or less	3,861
Available-for-sale securities, fair value, after 1 year through 5 years	5,645
Available-for-sale securities, fair value, after 5 years through 10 years	6,681
Available-for-sale securities, fair value, after 10 years	29,611
Available-for-sale securities, fair value	$ 45,798	131,536
Weighted-average yield, GAAP basis, available for sale securities	2.52%
Held to maturity securities, amortized cost, 1 year or less	$ 1,541
Held to maturity securities, amortized cost, after 1 year through 5 years	28,971
Held to maturity securities, amortized cost, after 5 years through 10 years	11,589
Held to maturity securities, amortized cost, after 10 years	48,552
Held to maturity securities, amortized cost	90,653	$ 1,426
Held-to-maturity securities, fair value, 1 year or less	1,527
Held-to-maturity securities, fair value, after 1 year through 5 years	27,909
Held-to-maturity securities, fair value, after 5 years through 10 years	10,879
Held-to-maturity securities, fair value, after 10 years	44,873
Held-to-maturity securities, fair value	$ 85,188
Weighted-average yield, GAAP basis, held to maturity securities	2.11%
1 Year or Less
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.38%
Weighted-average yield, GAAP basis, held to maturity securities	1.25%
After 1 Year through 5 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.67%
Weighted-average yield, GAAP basis, held to maturity securities	1.26%
After 5 Years through 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.30%
Weighted-average yield, GAAP basis, held to maturity securities	2.01%
After 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.75%
Weighted-average yield, GAAP basis, held to maturity securities	2.66%
U.S. Treasury and government agencies
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 3,686
Available for sale securities, amortized cost, after 1 year through 5 years	3,265
Available for sale securities, amortized cost, after 5 years through 10 years	2,100
Available for sale securities, amortized cost, after 10 years	2,042
Securities available for sale debt securities, amortized cost	11,093
Held to maturity securities, amortized cost, 1 year or less	1,212
Held to maturity securities, amortized cost, after 1 year through 5 years	25,882
Held to maturity securities, amortized cost, after 5 years through 10 years	8,515
Held to maturity securities, amortized cost, after 10 years	511
Held to maturity securities, amortized cost	36,120
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	79
Available for sale securities, amortized cost, after 5 years through 10 years	2,985
Available for sale securities, amortized cost, after 10 years	28,927
Securities available for sale debt securities, amortized cost	31,993
Held to maturity securities, amortized cost, after 1 year through 5 years	9
Held to maturity securities, amortized cost, after 5 years through 10 years	264
Held to maturity securities, amortized cost, after 10 years	41,879
Held to maturity securities, amortized cost	42,152
Residential mortgage-backed \| Mortgage-backed Securities Non-agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 5 years through 10 years	7
Available for sale securities, amortized cost, after 10 years	718
Securities available for sale debt securities, amortized cost	725
Held to maturity securities, amortized cost, after 10 years	281
Held to maturity securities, amortized cost	281
Commercial mortgage-backed \| Mortgage-backed Securities Agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	59
Available for sale securities, amortized cost, after 1 year through 5 years	454
Available for sale securities, amortized cost, after 5 years through 10 years	1,095
Available for sale securities, amortized cost, after 10 years	322
Securities available for sale debt securities, amortized cost	1,930
Held to maturity securities, amortized cost, after 5 years through 10 years	448
Held to maturity securities, amortized cost, after 10 years	215
Held to maturity securities, amortized cost	663
Commercial mortgage-backed \| Mortgage-backed Securities Non-agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 1 year through 5 years	6
Available for sale securities, amortized cost, after 5 years through 10 years	388
Available for sale securities, amortized cost, after 10 years	969
Securities available for sale debt securities, amortized cost	1,363
Held to maturity securities, amortized cost, after 1 year through 5 years	115
Held to maturity securities, amortized cost, after 5 years through 10 years	5
Held to maturity securities, amortized cost, after 10 years	1,626
Held to maturity securities, amortized cost	1,746
Asset-backed
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 5 years through 10 years	10
Available for sale securities, amortized cost, after 10 years	96
Securities available for sale debt securities, amortized cost	106
Held to maturity securities, amortized cost, 1 year or less	99
Held to maturity securities, amortized cost, after 1 year through 5 years	1,908
Held to maturity securities, amortized cost, after 5 years through 10 years	1,765
Held to maturity securities, amortized cost, after 10 years	2,793
Held to maturity securities, amortized cost	6,565
Other
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	134
Available for sale securities, amortized cost, after 1 year through 5 years	2,228
Available for sale securities, amortized cost, after 5 years through 10 years	859
Available for sale securities, amortized cost, after 10 years	158
Securities available for sale debt securities, amortized cost	3,379
Held to maturity securities, amortized cost, 1 year or less	230
Held to maturity securities, amortized cost, after 1 year through 5 years	1,057
Held to maturity securities, amortized cost, after 5 years through 10 years	592
Held to maturity securities, amortized cost, after 10 years	1,247
Held to maturity securities, amortized cost	$ 3,126

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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