Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 1,587
Available for sale securities, amortized cost, after 1 year through 5 years	5,837
Available for sale securities, amortized cost, after 5 years through 10 years	7,013
Available for sale securities, amortized cost, after 10 years	31,580
Securities available for sale debt securities, amortized cost	46,017	$ 48,568
Available-for-sale securities, fair value, 1 year or less	1,550
Available-for-sale securities, fair value, after 1 year through 5 years	5,460
Available-for-sale securities, fair value, after 5 years through 10 years	6,385
Available-for-sale securities, fair value, after 10 years	28,392
Available-for-sale securities, fair value	$ 41,787	44,159
Weighted-average yield, GAAP basis, available for sale securities	2.75%
Held to maturity securities, amortized cost, 1 year or less	$ 2,359
Held to maturity securities, amortized cost, after 1 year through 5 years	34,930
Held to maturity securities, amortized cost, after 5 years through 10 years	5,792
Held to maturity securities, amortized cost, after 10 years	50,793
Held to maturity securities, amortized cost	93,874	95,175
Held-to-maturity securities, fair value, 1 year or less	2,330
Held-to-maturity securities, fair value, after 1 year through 5 years	33,471
Held-to-maturity securities, fair value, after 5 years through 10 years	5,526
Held-to-maturity securities, fair value, after 10 years	47,569
Held-to-maturity securities, fair value	$ 88,896	$ 90,279
Weighted-average yield, GAAP basis, held to maturity securities	2.36%
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	1.30%
After 1 Year through 5 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.17%
Weighted-average yield, GAAP basis, held to maturity securities	1.39%
After 5 Years through 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.39%
Weighted-average yield, GAAP basis, held to maturity securities	3.65%
After 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.98%
Weighted-average yield, GAAP basis, held to maturity securities	2.93%
U.S. Treasury and government agencies
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 1,230
Available for sale securities, amortized cost, after 1 year through 5 years	2,918
Available for sale securities, amortized cost, after 5 years through 10 years	1,724
Available for sale securities, amortized cost, after 10 years	1,991
Securities available for sale debt securities, amortized cost	7,863
Held to maturity securities, amortized cost, 1 year or less	2,075
Held to maturity securities, amortized cost, after 1 year through 5 years	31,522
Held to maturity securities, amortized cost, after 5 years through 10 years	2,477
Held to maturity securities, amortized cost, after 10 years	911
Held to maturity securities, amortized cost	36,985
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	134
Available for sale securities, amortized cost, after 5 years through 10 years	3,675
Available for sale securities, amortized cost, after 10 years	27,057
Securities available for sale debt securities, amortized cost	30,867
Held to maturity securities, amortized cost, after 1 year through 5 years	7
Held to maturity securities, amortized cost, after 5 years through 10 years	333
Held to maturity securities, amortized cost, after 10 years	43,938
Held to maturity securities, amortized cost	44,278
Residential mortgage-backed \| Mortgage-backed Securities Non-agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 5 years through 10 years	8
Available for sale securities, amortized cost, after 10 years	634
Securities available for sale debt securities, amortized cost	642
Held to maturity securities, amortized cost, after 10 years	269
Held to maturity securities, amortized cost	269
Commercial mortgage-backed \| Mortgage-backed Securities Agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	49
Available for sale securities, amortized cost, after 1 year through 5 years	409
Available for sale securities, amortized cost, after 5 years through 10 years	905
Available for sale securities, amortized cost, after 10 years	396
Securities available for sale debt securities, amortized cost	1,759
Held to maturity securities, amortized cost, after 1 year through 5 years	133
Held to maturity securities, amortized cost, after 5 years through 10 years	430
Held to maturity securities, amortized cost, after 10 years	276
Held to maturity securities, amortized cost	839
Commercial mortgage-backed \| Mortgage-backed Securities Non-agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 1 year through 5 years	119
Available for sale securities, amortized cost, after 5 years through 10 years	100
Available for sale securities, amortized cost, after 10 years	795
Securities available for sale debt securities, amortized cost	1,014
Held to maturity securities, amortized cost, 1 year or less	43
Held to maturity securities, amortized cost, after 1 year through 5 years	49
Held to maturity securities, amortized cost, after 10 years	1,457
Held to maturity securities, amortized cost	1,549
Asset-backed
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 1 year through 5 years	249
Available for sale securities, amortized cost, after 5 years through 10 years	106
Available for sale securities, amortized cost, after 10 years	555
Securities available for sale debt securities, amortized cost	910
Held to maturity securities, amortized cost, 1 year or less	11
Held to maturity securities, amortized cost, after 1 year through 5 years	2,103
Held to maturity securities, amortized cost, after 5 years through 10 years	1,949
Held to maturity securities, amortized cost, after 10 years	2,582
Held to maturity securities, amortized cost	6,645
Other
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	307
Available for sale securities, amortized cost, after 1 year through 5 years	2,008
Available for sale securities, amortized cost, after 5 years through 10 years	495
Available for sale securities, amortized cost, after 10 years	152
Securities available for sale debt securities, amortized cost	2,962
Held to maturity securities, amortized cost, 1 year or less	230
Held to maturity securities, amortized cost, after 1 year through 5 years	1,116
Held to maturity securities, amortized cost, after 5 years through 10 years	603
Held to maturity securities, amortized cost, after 10 years	1,360
Held to maturity securities, amortized cost	$ 3,309

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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