Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) - Fair Value, Recurring - Level 3 - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 6,305	$ 4,938	$ 5,137	$ 5,395
Included in Earnings	382	157	957	(364)
Included in other comprehensive income	(5)	15	17	(100)
Purchases	213	200	879	485
Sales	(733)	(60)	(876)	(168)
Issuances	46	32	122	99
Settlements	(314)	(255)	(903)	(337)
Transfers into Level 3	4	3	12	109
Transfers out of Level 3	(11)	(10)	(29)	(99)
Impact from BBVA Acquisition	17		588
Ending Balance	5,904	5,020	5,904	5,020
Unrealized gains/losses on assets held on Consolidated Balance Sheet	218	149	750	(402)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	326	296	318	344
Included in Earnings	210	(3)	263	39
Sales	3	1	6	3
Issuances	7	19	325	81
Settlements	(44)	(78)	(417)	(234)
Transfers into Level 3				2
Impact from BBVA Acquisition			7
Ending Balance	502	235	502	235
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	215	(1)	237	28
Fair Value Additional Information [Abstract]
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities	172	160	694	(403)
Net unrealized gains (losses) relating to Level 3 assets and liabilities	3	150	513	(430)
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	119	88	163	2
Included in Earnings	(1)		(1)
Purchases	5	15	43	22
Sales	(29)	(10)	(81)	(12)
Settlements	(6)	(9)	(34)	(12)
Transfers into Level 3	4	3	12	90
Transfers out of Level 3	(6)	(10)	(16)	(13)
Ending Balance	86	77	86	77
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(1)		(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	52	60	57	64
Included in Earnings	(1)	(1)	(1)	(2)
Sales			(6)
Settlements			1	(3)
Ending Balance	51	59	51	59
Unrealized gains/losses on assets held on Consolidated Balance Sheet			1	(1)
Loans held for sale \| Other consumer loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	239
Sales	(256)		(256)
Impact from BBVA Acquisition	17		256
Securities available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,496	1,792	1,647	2,055
Included in Earnings	11	13	32	45
Included in other comprehensive income	(5)	15	17	(100)
Purchases	2	(1)	5	3
Sales	(9)		(9)
Settlements	(83)	(91)	(280)	(294)
Transfers into Level 3				19
Ending Balance	1,412	1,728	1,412	1,728
Securities available for sale \| Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,237	1,491	1,365	1,741
Included in Earnings	10	12	30	40
Included in other comprehensive income	(2)	18	14	(81)
Settlements	(77)	(83)	(241)	(262)
Ending Balance	1,168	1,438	1,168	1,438
Securities available for sale \| Commercial mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	11	19	11
Included in other comprehensive income	(8)	(8)	(8)	(8)
Transfers into Level 3				19
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	175	210	199	240
Included in Earnings	1	1	2	5
Included in other comprehensive income	5	5	10	(8)
Purchases
Settlements	(9)	(8)	(39)	(29)
Ending Balance	172	208	172	208
Securities available for sale \| Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	73	72	72	74
Included in other comprehensive income			1	(3)
Purchases	2	(1)	5	3
Sales	(9)		(9)
Settlements	3			(3)
Ending Balance	69	71	69	71
Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	979	607	647	300
Included in Earnings	12	7	32	20
Purchases	14	63	111	134
Sales	(6)	(3)	(12)	(34)
Issuances
Settlements	(58)	(27)	(121)	313
Transfers out of Level 3	(5)		(13)	(86)
Impact from BBVA Acquisition			292
Ending Balance	936	647	936	647
Unrealized gains/losses on assets held on Consolidated Balance Sheet	12	7	32	20
Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,540	1,183	1,263	1,276
Included in Earnings	265	63	489	(68)
Purchases	158	60	290	173
Sales	(433)	(47)	(512)	(122)
Ending Balance	1,530	1,259	1,530	1,259
Unrealized gains/losses on assets held on Consolidated Balance Sheet	95	56	294	(69)
Mortgage Servicing Rights \| Residential mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,111	577	673	995
Included in Earnings	49	11	203	(408)
Purchases	28	52	400	113
Issuances	24	12	61	34
Settlements	(82)	(54)	(242)	(136)
Impact from BBVA Acquisition			35
Ending Balance	1,130	598	1,130	598
Unrealized gains/losses on assets held on Consolidated Balance Sheet	49	11	203	(408)
Mortgage Servicing Rights \| Commercial mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	682	490	569	649
Included in Earnings	24	23	134	(143)
Purchases	5	8	26	31
Issuances	22	20	61	65
Settlements	(30)	(26)	(87)	(87)
Ending Balance	703	515	703	515
Unrealized gains/losses on assets held on Consolidated Balance Sheet	24	23	134	(144)
Financial derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	87	141	118	54
Included in Earnings	23	41	69	192
Purchases	1	3	4	9
Settlements	(55)	(48)	(140)	(118)
Impact from BBVA Acquisition			5
Ending Balance	56	137	56	137
Unrealized gains/losses on assets held on Consolidated Balance Sheet	39	52	87	200
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	200	209	273	200
Included in Earnings	165	(10)	155	26
Sales	3	1	6	3
Settlements	(37)	(57)	(110)	(86)
Impact from BBVA Acquisition			7
Ending Balance	331	143	331	143
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	171	(7)	156	30
Other borrowed funds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2	2	2	7
Issuances	3	2	4	27
Settlements	(1)	(2)	(2)	(32)
Ending Balance	4	2	4	2
Other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	124	85	43	137
Included in Earnings	45	7	108	13
Issuances	4	17	321	54
Settlements	(6)	(19)	(305)	(116)
Transfers into Level 3				2
Ending Balance	167	90	167	90
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	$ 44	$ 6	$ 81	$ (2)

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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 transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

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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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