Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 1,490
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	15,770
Available for sale securities, amortized cost, after 10 years	31,642
Securities available for sale debt securities, amortized cost	54,896	$ 45,353
Available-for-sale securities, fair value, 1 year or less	1,480
Available-for-sale securities, fair value, after 1 year through 5 years	5,808
Available-for-sale securities, fair value, after 5 years through 10 years	15,422
Available-for-sale securities, fair value, after 10 years	28,478
Available-for-sale securities, fair value	$ 51,188	41,785
Weighted-average yield, GAAP basis, available for sale securities	3.63%
Held to maturity securities, amortized cost, 1 year or less	$ 10,585
Held to maturity securities, amortized cost, after 1 year through 5 years	25,099
Held to maturity securities, amortized cost, after 5 years through 10 years	5,192
Held to maturity securities, amortized cost, after 10 years	46,581
Held to maturity securities, amortized cost	87,457	90,784
Held-to-maturity securities, fair value, 1 year or less	10,461
Held-to-maturity securities, fair value, after 1 year through 5 years	24,133
Held-to-maturity securities, fair value, after 5 years through 10 years	4,989
Held-to-maturity securities, fair value, after 10 years	42,672
Held-to-maturity securities, fair value	$ 82,255	86,948
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	1.43%
Weighted-average yield, GAAP basis, held to maturity securities	0.96%
After 1 Year through 5 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.57%
Weighted-average yield, GAAP basis, held to maturity securities	1.60%
After 5 Years through 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	4.13%
Weighted-average yield, GAAP basis, held to maturity securities	3.79%
After 10 Years
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.50%
Weighted-average yield, GAAP basis, held to maturity securities	2.97%
U.S. Treasury and government agencies
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	$ 1,202
Available for sale securities, amortized cost, after 1 year through 5 years	2,470
Available for sale securities, amortized cost, after 5 years through 10 years	10,854
Available for sale securities, amortized cost, after 10 years	2,342
Securities available for sale debt securities, amortized cost	16,868	7,596
Available-for-sale securities, fair value	16,474	6,951
Held to maturity securities, amortized cost, 1 year or less	10,363
Held to maturity securities, amortized cost, after 1 year through 5 years	22,586
Held to maturity securities, amortized cost, after 5 years through 10 years	1,635
Held to maturity securities, amortized cost, after 10 years	884
Held to maturity securities, amortized cost	35,468	36,529
Held-to-maturity securities, fair value	34,166	35,397
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	222
Available for sale securities, amortized cost, after 5 years through 10 years	3,472
Available for sale securities, amortized cost, after 10 years	26,539
Securities available for sale debt securities, amortized cost	30,234
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	309
Held to maturity securities, amortized cost, after 10 years	41,547
Held to maturity securities, amortized cost	41,865
Residential mortgage-backed \| Mortgage-backed Securities Non-agency
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	523
Securities available for sale debt securities, amortized cost	534
Held to maturity securities, amortized cost, after 10 years	250
Held to maturity securities, amortized cost	250
Commercial mortgage servicing rights \| Mortgage-backed Securities Agency
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	6
Available for sale securities, amortized cost, after 1 year through 5 years	664
Available for sale securities, amortized cost, after 5 years through 10 years	751
Available for sale securities, amortized cost, after 10 years	337
Securities available for sale debt securities, amortized cost	1,758
Held to maturity securities, amortized cost, after 1 year through 5 years	158
Held to maturity securities, amortized cost, after 5 years through 10 years	587
Held to maturity securities, amortized cost, after 10 years	211
Held to maturity securities, amortized cost	956
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	105
Available for sale securities, amortized cost, after 5 years through 10 years	73
Available for sale securities, amortized cost, after 10 years	645
Securities available for sale debt securities, amortized cost	824
Held to maturity securities, amortized cost, 1 year or less
Held to maturity securities, amortized cost, after 1 year through 5 years	49
Held to maturity securities, amortized cost, after 10 years	1,140
Held to maturity securities, amortized cost	1,189
Asset-backed
Debt Securities [Line Items]
Available for sale securities, amortized cost, after 1 year through 5 years	667
Available for sale securities, amortized cost, after 5 years through 10 years	318
Available for sale securities, amortized cost, after 10 years	1,112
Securities available for sale debt securities, amortized cost	2,097
Held to maturity securities, amortized cost, 1 year or less	20
Held to maturity securities, amortized cost, after 1 year through 5 years	1,329
Held to maturity securities, amortized cost, after 5 years through 10 years	2,228
Held to maturity securities, amortized cost, after 10 years	1,256
Held to maturity securities, amortized cost	4,833
Other
Debt Securities [Line Items]
Available for sale securities, amortized cost, 1 year or less	280
Available for sale securities, amortized cost, after 1 year through 5 years	1,866
Available for sale securities, amortized cost, after 5 years through 10 years	291
Available for sale securities, amortized cost, after 10 years	144
Securities available for sale debt securities, amortized cost	2,581	2,844
Available-for-sale securities, fair value	2,460	2,727
Held to maturity securities, amortized cost, 1 year or less	202
Held to maturity securities, amortized cost, after 1 year through 5 years	968
Held to maturity securities, amortized cost, after 5 years through 10 years	433
Held to maturity securities, amortized cost, after 10 years	1,293
Held to maturity securities, amortized cost	2,896	3,108
Held-to-maturity securities, fair value	$ 2,863	$ 3,123

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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