Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) - Fair Value, Recurring - Level 3 - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 7,448	$ 7,252
Included in Earnings	187	109
Included in other comprehensive income	(5)	(13)
Purchases	121	182
Sales	(6)	(71)
Issuances	8	18
Settlements	(192)	(197)
Transfers into Level 3	2	6
Transfers out of Level 3	(8)	(144)
Ending Balance	7,555	7,142
Unrealized gains/losses on assets held on Consolidated Balance Sheet	185	102
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	398	421
Included in Earnings	(12)	63
Purchases
Sales		2
Issuances	16	21
Settlements	(91)	(176)
Ending Balance	311	331
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	11	62
Fair Value Additional Information [Abstract]
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities	199	46
Net unrealized gains (losses) relating to Level 3 assets and liabilities	174	40
Loans held for sale \| Residential mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	103	243
Included in Earnings	(1)	4
Purchases	2	6
Sales		(1)
Settlements	(2)	(5)
Transfers into Level 3	2	3
Transfers out of Level 3	(6)	(8)
Ending Balance	98	242
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(1)	3
Loans held for sale \| Commercial mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	11	33
Included in Earnings		(1)
Ending Balance	11	32
Unrealized gains/losses on assets held on Consolidated Balance Sheet
Non-agency \| Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	696
Included in Earnings	3
Included in other comprehensive income	(6)
Settlements	(25)
Ending Balance	668
Non-agency \| Commercial mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	103
Transfers into Level 3
Ending Balance	103
Securities available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	956	1,001
Included in Earnings	1	4
Included in other comprehensive income	(5)	(13)
Purchases
Settlements	(28)	(31)
Transfers into Level 3		3
Ending Balance	924	964
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(2)
Securities available for sale \| Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		819
Included in Earnings		4
Included in other comprehensive income		(10)
Settlements		(26)
Ending Balance		787
Securities available for sale \| Commercial mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		3
Included in other comprehensive income
Ending Balance		3
Securities available for sale \| Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	102	124
Included in Earnings
Included in other comprehensive income		1
Settlements	(2)	(4)
Ending Balance	100	121
Securities available for sale \| Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	55	55
Included in Earnings	(2)
Included in other comprehensive income	1	(4)
Purchases
Settlements	(1)	(1)
Transfers into Level 3		3
Ending Balance	53	53
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(2)
Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	726	769
Included in Earnings	4	3
Included in other comprehensive income
Purchases	5	9
Sales
Settlements	(20)	(22)
Transfers into Level 3
Transfers out of Level 3	(2)	(2)
Ending Balance	713	757
Unrealized gains/losses on assets held on Consolidated Balance Sheet	5	3
Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,952	1,778
Included in Earnings	(5)	121
Purchases	89	140
Sales	(6)	(70)
Transfers out of Level 3		(134)
Ending Balance	2,030	1,835
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(5)	117
Mortgage Servicing Rights \| Residential mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,654	2,310
Included in Earnings	72	(48)
Purchases	13	18
Issuances	5	5
Settlements	(57)	(53)
Ending Balance	2,687	2,232
Unrealized gains/losses on assets held on Consolidated Balance Sheet	72	(47)
Mortgage Servicing Rights \| Commercial mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,032	1,113
Included in Earnings	107	9
Purchases	12	8
Issuances	3	13
Settlements	(79)	(82)
Ending Balance	1,075	1,061
Unrealized gains/losses on assets held on Consolidated Balance Sheet	107	9
Financial derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	6	5
Included in Earnings	9	17
Purchases		1
Settlements	(6)	(4)
Ending Balance	9	19
Unrealized gains/losses on assets held on Consolidated Balance Sheet	9	17
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	152	123
Included in Earnings	8	39
Sales		2
Settlements	(47)	(67)
Ending Balance	113	97
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	9	42
Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	8
Purchases
Transfers into Level 3
Ending Balance	8
Other borrowed funds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	9	4
Issuances	3	3
Settlements	(3)	(2)
Ending Balance	9	5
Other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	237	294
Included in Earnings	(20)	24
Purchases
Issuances	13	18
Settlements	(41)	(107)
Ending Balance	189	229
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	$ 2	$ 20

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This item represents the amount of the net change in unrealized (holding) gains or losses for the period which are included in the statement of income. Such unrealized (holding) gains or losses relate to those assets and liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

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This element represents net gains or losses for the period (realized and unrealized), arising from assets and liabilities measure at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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-Topic 820
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-Name Accounting Standards Codification
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Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sales of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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