Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) - Fair Value, Recurring - Level 3 - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 7,252	$ 5,882
Included in Earnings	109	412
Included in other comprehensive income	(13)	(28)
Purchases	182	165
Sales	(71)	(20)
Issuances	18	42
Settlements	(197)	(237)
Transfers into Level 3	6	5
Transfers out of Level 3	(144)	(8)
Ending Balance	7,142	6,213
Unrealized gains/losses on assets held on Consolidated Balance Sheet	102	421
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	421	463
Included in Earnings	63	12
Purchases
Sales	2	3
Issuances	21	73
Settlements	(176)	(156)
Ending Balance	331	395
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	62	14
Fair Value Additional Information [Abstract]
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities	46	400
Net unrealized gains (losses) relating to Level 3 assets and liabilities	40	407
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	243	81
Included in Earnings	4	(1)
Purchases	6	37
Sales	(1)	(2)
Settlements	(5)	(5)
Transfers into Level 3	3	5
Transfers out of Level 3	(8)	(7)
Ending Balance	242	108
Unrealized gains/losses on assets held on Consolidated Balance Sheet	3	(1)
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	33	49
Included in Earnings	(1)	(4)
Settlements
Ending Balance	32	45
Unrealized gains/losses on assets held on Consolidated Balance Sheet		(3)
Securities available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,001	1,332
Included in Earnings	4	8
Included in other comprehensive income	(13)	(28)
Purchases		1
Settlements	(31)	(73)
Transfers into Level 3	3
Ending Balance	964	1,240
Securities available for sale \| Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	819	1,097
Included in Earnings	4	8
Included in other comprehensive income	(10)	(23)
Settlements	(26)	(63)
Ending Balance	787	1,019
Securities available for sale \| Commercial mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3	3
Included in other comprehensive income
Ending Balance	3	3
Securities available for sale \| Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	124	163
Included in other comprehensive income	1	(4)
Settlements	(4)	(7)
Ending Balance	121	152
Securities available for sale \| Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	55	69
Included in other comprehensive income	(4)	(1)
Purchases		1
Settlements	(1)	(3)
Transfers into Level 3	3
Ending Balance	53	66
Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	769	884
Included in Earnings	3	11
Purchases	9	13
Sales		(7)
Settlements	(22)	(49)
Transfers out of Level 3	(2)	(1)
Ending Balance	757	851
Unrealized gains/losses on assets held on Consolidated Balance Sheet	3	11
Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,778	1,680
Included in Earnings	121	53
Purchases	140	29
Sales	(70)	(11)
Transfers out of Level 3	(134)
Ending Balance	1,835	1,751
Unrealized gains/losses on assets held on Consolidated Balance Sheet	117	53
Mortgage Servicing Rights \| Residential mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,310	1,078
Included in Earnings	(48)	207
Purchases	18	76
Issuances	5	21
Settlements	(53)	(60)
Ending Balance	2,232	1,322
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(47)	208
Mortgage Servicing Rights \| Commercial mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,113	740
Included in Earnings	9	151
Purchases	8	8
Issuances	13	21
Settlements	(82)	(34)
Ending Balance	1,061	886
Unrealized gains/losses on assets held on Consolidated Balance Sheet	9	151
Financial derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	5	38
Included in Earnings	17	(13)
Purchases	1	1
Settlements	(4)	(16)
Ending Balance	19	10
Unrealized gains/losses on assets held on Consolidated Balance Sheet	17	2
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	123	285
Included in Earnings	39	5
Sales	2	3
Settlements	(67)	(59)
Ending Balance	97	234
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	42	8
Other borrowed funds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	4	3
Issuances	3	2
Settlements	(2)	(2)
Ending Balance	5	3
Other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	294	175
Included in Earnings	24	7
Issuances	18	71
Settlements	(107)	(95)
Ending Balance	229	158
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	$ 20	$ 6

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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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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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Fair value 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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