Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) - Fair Value, Recurring - Level 3 - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 6,213	$ 5,611	$ 5,882	$ 5,137
Included in Earnings	390	78	802	575
Included in other comprehensive income	(53)	3	(81)	22
Purchases	304	417	469	666
Sales	(94)	(97)	(114)	(143)
Issuances	31	45	73	76
Settlements	(232)	(318)	(469)	(589)
Transfers into Level 3	9	5	14	8
Transfers out of Level 3	(22)	(10)	(30)	(18)
Impact from BBVA Acquisition		571		571
Ending Balance	6,546	6,305	6,546	6,305
Unrealized gains/losses on assets held on Consolidated Balance Sheet	389	44	806	531
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	395	302	463	318
Included in Earnings	32	32	44	53
Sales	3	1	6	3
Issuances	173	287	246	318
Settlements	(205)	(303)	(361)	(373)
Impact from BBVA Acquisition		7		7
Ending Balance	398	326	398	326
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	29	46	33	20
Fair Value Additional Information [Abstract]
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities	358	46	758	522
Net unrealized gains (losses) relating to Level 3 assets and liabilities	360	(2)	773	511
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	108	165	81	163
Included in Earnings	(1)	(1)	(2)
Purchases	8	3	45	38
Sales	(30)	(36)	(32)	(52)
Settlements	(4)	(12)	(9)	(28)
Transfers into Level 3	9	5	14	8
Transfers out of Level 3	(7)	(5)	(14)	(10)
Ending Balance	83	119	83	119
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(1)		(2)
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	45	56	49	57
Included in Earnings		1	(4)
Sales		(6)		(6)
Settlements	(7)	1	(7)	1
Ending Balance	38	52	38	52
Unrealized gains/losses on assets held on Consolidated Balance Sheet			(4)	1
Loans held for sale \| Other consumer loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Impact from BBVA Acquisition		239		239
Ending Balance		239		239
Securities available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,240	1,593	1,332	1,647
Included in Earnings	8	11	16	21
Included in other comprehensive income	(53)	3	(81)	22
Purchases	2	2	3	3
Sales
Settlements	(64)	(113)	(137)	(197)
Ending Balance	1,133	1,496	1,133	1,496
Securities available for sale \| Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,019	1,316	1,097	1,365
Included in Earnings	7	11	15	20
Included in other comprehensive income	(43)		(66)	16
Settlements	(58)	(90)	(121)	(164)
Ending Balance	925	1,237	925	1,237
Securities available for sale \| Commercial mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3	11	3	11
Ending Balance	3	11	3	11
Securities available for sale \| Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	152	194	163	199
Included in Earnings	1		1	1
Included in other comprehensive income	(9)	2	(13)	5
Settlements	(6)	(21)	(13)	(30)
Ending Balance	138	175	138	175
Securities available for sale \| Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	66	72	69	72
Included in other comprehensive income	(1)	1	(2)	1
Purchases	2	2	3	3
Settlements		(2)	(3)	(3)
Ending Balance	67	73	67	73
Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	851	711	884	647
Included in Earnings	10	10	21	20
Purchases	7	9	20	97
Sales	(1)	(3)	(8)	(6)
Settlements	(48)	(35)	(97)	(63)
Transfers out of Level 3	(15)	(5)	(16)	(8)
Impact from BBVA Acquisition		292		292
Ending Balance	804	979	804	979
Unrealized gains/losses on assets held on Consolidated Balance Sheet	9	10	21	20
Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,751	1,343	1,680	1,263
Included in Earnings	92	157	145	224
Purchases	87	92	116	132
Sales	(63)	(52)	(74)	(79)
Ending Balance	1,867	1,540	1,867	1,540
Unrealized gains/losses on assets held on Consolidated Balance Sheet	94	136	146	199
Mortgage Servicing Rights \| Residential mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,322	979	1,078	673
Included in Earnings	163	(141)	370	154
Purchases	181	301	257	372
Issuances	17	24	38	37
Settlements	(63)	(87)	(123)	(160)
Impact from BBVA Acquisition		35		35
Ending Balance	1,620	1,111	1,620	1,111
Unrealized gains/losses on assets held on Consolidated Balance Sheet	163	(141)	371	154
Mortgage Servicing Rights \| Commercial mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	886	701	740	569
Included in Earnings	111	(19)	262	110
Purchases	17	8	25	21
Issuances	14	21	35	39
Settlements	(40)	(29)	(74)	(57)
Ending Balance	988	682	988	682
Unrealized gains/losses on assets held on Consolidated Balance Sheet	111	(18)	262	111
Financial derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	10	63	38	118
Included in Earnings	7	60	(6)	46
Purchases	2	2	3	3
Settlements	(6)	(43)	(22)	(85)
Impact from BBVA Acquisition		5		5
Ending Balance	13	87	13	87
Unrealized gains/losses on assets held on Consolidated Balance Sheet	13	57	12	46
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	234	227	285	273
Included in Earnings	18	4	23	(10)
Sales	3	1	6	3
Settlements	(42)	(39)	(101)	(73)
Impact from BBVA Acquisition		7		7
Ending Balance	213	200	213	200
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	19	19	18	(11)
Other borrowed funds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3	2	3	2
Issuances	2		4	1
Settlements	(2)		(4)	(1)
Ending Balance	3	2	3	2
Other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	158	73	175	43
Included in Earnings	14	28	21	63
Issuances	171	287	242	317
Settlements	(161)	(264)	(256)	(299)
Ending Balance	182	124	182	124
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	$ 10	$ 27	$ 15	$ 31

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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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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Business Acquisition

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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 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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Amount of settlements 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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