Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 1,590
Available for sale securities, amortized cost, after 1 year through 5 years	6,189
Available for sale securities, amortized cost, after 5 years through 10 years	6,956
Available for sale securities, amortized cost, after 10 years	32,242
Securities available for sale debt securities, amortized cost	46,977	$ 48,568
Available-for-sale securities, fair value, 1 year or less	1,574
Available-for-sale securities, fair value, after 1 year through 5 years	5,847
Available-for-sale securities, fair value, after 5 years through 10 years	6,419
Available-for-sale securities, fair value, after 10 years	29,380
Available-for-sale securities, fair value	$ 43,220	44,159
Weighted-average yield, GAAP basis, available for sale securities	2.23%
Held to maturity securities, amortized cost, 1 year or less	$ 2,134
Held to maturity securities, amortized cost, after 1 year through 5 years	33,867
Held to maturity securities, amortized cost, after 5 years through 10 years	7,232
Held to maturity securities, amortized cost, after 10 years	51,786
Held to maturity securities, amortized cost	95,019	95,175
Held-to-maturity securities, fair value, 1 year or less	2,107
Held-to-maturity securities, fair value, after 1 year through 5 years	32,973
Held-to-maturity securities, fair value, after 5 years through 10 years	6,986
Held-to-maturity securities, fair value, after 10 years	49,359
Held-to-maturity securities, fair value	$ 91,425	$ 90,279
Weighted-average yield, GAAP basis, held to maturity securities	2.35%
1 Year or Less
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.23%
Weighted-average yield, GAAP basis, held to maturity securities	1.28%
After 1 Year through 5 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	1.39%
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	3.27%
After 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.93%
Weighted-average yield, GAAP basis, held to maturity securities	2.90%
U.S. Treasury and government agencies
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 1,217
Available for sale securities, amortized cost, after 1 year through 5 years	3,400
Available for sale securities, amortized cost, after 5 years through 10 years	1,789
Available for sale securities, amortized cost, after 10 years	2,047
Securities available for sale debt securities, amortized cost	8,453
Held to maturity securities, amortized cost, 1 year or less	1,927
Held to maturity securities, amortized cost, after 1 year through 5 years	30,359
Held to maturity securities, amortized cost, after 5 years through 10 years	3,634
Held to maturity securities, amortized cost, after 10 years	918
Held to maturity securities, amortized cost	36,838
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	97
Available for sale securities, amortized cost, after 5 years through 10 years	3,598
Available for sale securities, amortized cost, after 10 years	27,814
Securities available for sale debt securities, amortized cost	31,510
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	326
Held to maturity securities, amortized cost, after 10 years	44,856
Held to maturity securities, amortized cost	45,191
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	667
Securities available for sale debt securities, amortized cost	675
Held to maturity securities, amortized cost, after 10 years	272
Held to maturity securities, amortized cost	272
Commercial mortgage-backed \| Mortgage-backed Securities Agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	64
Available for sale securities, amortized cost, after 1 year through 5 years	443
Available for sale securities, amortized cost, after 5 years through 10 years	924
Available for sale securities, amortized cost, after 10 years	421
Securities available for sale debt securities, amortized cost	1,852
Held to maturity securities, amortized cost, after 1 year through 5 years	85
Held to maturity securities, amortized cost, after 5 years through 10 years	474
Held to maturity securities, amortized cost, after 10 years	263
Held to maturity securities, amortized cost	822
Commercial mortgage-backed \| Mortgage-backed Securities Non-agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 1 year through 5 years	120
Available for sale securities, amortized cost, after 5 years through 10 years	100
Available for sale securities, amortized cost, after 10 years	800
Securities available for sale debt securities, amortized cost	1,020
Held to maturity securities, amortized cost, after 1 year through 5 years	114
Held to maturity securities, amortized cost, after 5 years through 10 years
Held to maturity securities, amortized cost, after 10 years	1,490
Held to maturity securities, amortized cost	1,604
Asset-backed
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 1 year through 5 years	45
Available for sale securities, amortized cost, after 5 years through 10 years	9
Available for sale securities, amortized cost, after 10 years	339
Securities available for sale debt securities, amortized cost	393
Held to maturity securities, amortized cost, 1 year or less	7
Held to maturity securities, amortized cost, after 1 year through 5 years	2,145
Held to maturity securities, amortized cost, after 5 years through 10 years	2,132
Held to maturity securities, amortized cost, after 10 years	2,600
Held to maturity securities, amortized cost	6,884
Other
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	308
Available for sale securities, amortized cost, after 1 year through 5 years	2,084
Available for sale securities, amortized cost, after 5 years through 10 years	528
Available for sale securities, amortized cost, after 10 years	154
Securities available for sale debt securities, amortized cost	3,074
Held to maturity securities, amortized cost, 1 year or less	200
Held to maturity securities, amortized cost, after 1 year through 5 years	1,155
Held to maturity securities, amortized cost, after 5 years through 10 years	666
Held to maturity securities, amortized cost, after 10 years	1,387
Held to maturity securities, amortized cost	$ 3,408

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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