Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 2,246
Available for sale securities, amortized cost, after 1 year through 5 years	5,994
Available for sale securities, amortized cost, after 5 years through 10 years	6,190
Available for sale securities, amortized cost, after 10 years	31,560
Securities available for sale debt securities, amortized cost	45,990	$ 48,568
Available-for-sale securities, fair value, 1 year or less	2,179
Available-for-sale securities, fair value, after 1 year through 5 years	5,487
Available-for-sale securities, fair value, after 5 years through 10 years	5,603
Available-for-sale securities, fair value, after 10 years	27,321
Available-for-sale securities, fair value	$ 40,590	44,159
Weighted-average yield, GAAP basis, available for sale securities	2.84%
Held to maturity securities, amortized cost, 1 year or less	$ 3,317
Held to maturity securities, amortized cost, after 1 year through 5 years	33,816
Held to maturity securities, amortized cost, after 5 years through 10 years	5,065
Held to maturity securities, amortized cost, after 10 years	49,599
Held to maturity securities, amortized cost	91,797	95,175
Held-to-maturity securities, fair value, 1 year or less	3,253
Held-to-maturity securities, fair value, after 1 year through 5 years	32,192
Held-to-maturity securities, fair value, after 5 years through 10 years	4,753
Held-to-maturity securities, fair value, after 10 years	44,249
Held-to-maturity securities, fair value	$ 84,447	90,279
Weighted-average yield, GAAP basis, held to maturity securities	2.38%
1 Year or Less
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	1.25%
Weighted-average yield, GAAP basis, held to maturity securities	0.93%
After 1 Year through 5 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.25%
Weighted-average yield, GAAP basis, held to maturity securities	1.44%
After 5 Years through 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.77%
Weighted-average yield, GAAP basis, held to maturity securities	4.10%
After 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.08%
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	$ 1,912
Available for sale securities, amortized cost, after 1 year through 5 years	2,958
Available for sale securities, amortized cost, after 5 years through 10 years	800
Available for sale securities, amortized cost, after 10 years	1,824
Securities available for sale debt securities, amortized cost	7,494	9,196
Available-for-sale securities, fair value	6,717	8,370
Held to maturity securities, amortized cost, 1 year or less	3,087
Held to maturity securities, amortized cost, after 1 year through 5 years	30,686
Held to maturity securities, amortized cost, after 5 years through 10 years	1,705
Held to maturity securities, amortized cost, after 10 years	907
Held to maturity securities, amortized cost	36,385	36,571
Held-to-maturity securities, fair value	34,439	34,960
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	185
Available for sale securities, amortized cost, after 5 years through 10 years	3,811
Available for sale securities, amortized cost, after 10 years	27,180
Securities available for sale debt securities, amortized cost	31,177
Held to maturity securities, amortized cost, after 1 year through 5 years	6
Held to maturity securities, amortized cost, after 5 years through 10 years	321
Held to maturity securities, amortized cost, after 10 years	43,063
Held to maturity securities, amortized cost	43,390
Residential mortgage-backed \| Mortgage-backed Securities Non-agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 5 years through 10 years	9
Available for sale securities, amortized cost, after 10 years	598
Securities available for sale debt securities, amortized cost	607
Held to maturity securities, amortized cost, after 10 years	263
Held to maturity securities, amortized cost	263
Commercial mortgage servicing rights \| Mortgage-backed Securities Agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	46
Available for sale securities, amortized cost, after 1 year through 5 years	444
Available for sale securities, amortized cost, after 5 years through 10 years	865
Available for sale securities, amortized cost, after 10 years	383
Securities available for sale debt securities, amortized cost	1,738
Held to maturity securities, amortized cost, after 1 year through 5 years	136
Held to maturity securities, amortized cost, after 5 years through 10 years	490
Held to maturity securities, amortized cost, after 10 years	284
Held to maturity securities, amortized cost	910
Commercial mortgage servicing rights \| Mortgage-backed Securities Non-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	103
Available for sale securities, amortized cost, after 5 years through 10 years	118
Available for sale securities, amortized cost, after 10 years	760
Securities available for sale debt securities, amortized cost	982
Held to maturity securities, amortized cost, 1 year or less	42
Held to maturity securities, amortized cost, after 1 year through 5 years	49
Held to maturity securities, amortized cost, after 10 years	1,365
Held to maturity securities, amortized cost	1,456
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	171
Available for sale securities, amortized cost, after 10 years	664
Securities available for sale debt securities, amortized cost	1,084
Held to maturity securities, amortized cost, 1 year or less	7
Held to maturity securities, amortized cost, after 1 year through 5 years	1,886
Held to maturity securities, amortized cost, after 5 years through 10 years	1,949
Held to maturity securities, amortized cost, after 10 years	2,372
Held to maturity securities, amortized cost	6,214
Other
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	286
Available for sale securities, amortized cost, after 1 year through 5 years	2,055
Available for sale securities, amortized cost, after 5 years through 10 years	416
Available for sale securities, amortized cost, after 10 years	151
Securities available for sale debt securities, amortized cost	2,908	3,288
Available-for-sale securities, fair value	2,699	3,087
Held to maturity securities, amortized cost, 1 year or less	181
Held to maturity securities, amortized cost, after 1 year through 5 years	1,053
Held to maturity securities, amortized cost, after 5 years through 10 years	600
Held to maturity securities, amortized cost, after 10 years	1,345
Held to maturity securities, amortized cost	3,179	3,354
Held-to-maturity securities, fair value	$ 3,040	$ 3,307

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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