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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 6,987	$ 6,546	$ 7,252	$ 5,882
Included in Earnings	348	481	656	1,283
Included in other comprehensive income	(22)	(21)	(22)	(102)
Purchases	577	497	970	966
Sales	(186)	(311)	(627)	(425)
Issuances	13	28	55	101
Settlements	(233)	(207)	(658)	(676)
Transfers into Level 3	99	8	120	22
Transfers out of Level 3	(10)	(16)	(173)	(46)
Ending Balance	7,573	7,005	7,573	7,005
Unrealized gains/losses on assets held on Consolidated Balance Sheet	337	379	613	1,183
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	384	398	421	463
Included in Earnings	56	15	229	59
Purchases		32		32
Sales	2	4	5	10
Issuances	332	362	445	608
Settlements	(409)	(420)	(735)	(781)
Ending Balance	365	391	365	391
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	51	17	214	61
Fair Value Additional Information [Abstract]
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities	292	466	427	1,224
Net unrealized gains (losses) relating to Level 3 assets and liabilities	286	362	399	1,122
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	191	83	243	81
Included in Earnings	(3)	(4)	(3)	(6)
Purchases	3	46	12	91
Sales	(89)	(1)	(131)	(33)
Settlements	(2)	(2)	(9)	(11)
Transfers into Level 3	1	8	4	22
Transfers out of Level 3	(4)	(14)	(19)	(28)
Ending Balance	97	116	97	116
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(4)	(4)	(3)	(6)
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	25	38	33	49
Included in Earnings				(4)
Settlements		(3)	(8)	(10)
Ending Balance	25	35	25	35
Unrealized gains/losses on assets held on Consolidated Balance Sheet				(4)
Non-agency \| Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	768		819
Included in Earnings	5		13
Included in other comprehensive income	(20)		(16)
Settlements	(40)		(103)
Ending Balance	713		713
Non-agency \| Commercial mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3		3
Transfers into Level 3	92		92
Ending Balance	95		95
Securities available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	942	1,133	1,001	1,332
Included in Earnings	4	4	13	20
Included in other comprehensive income	(22)	(21)	(22)	(102)
Purchases	3		6	3
Sales
Settlements	(52)	(46)	(126)	(183)
Transfers into Level 3	92		95
Ending Balance	967	1,070	967	1,070
Securities available for sale \| Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		925		1,097
Included in Earnings		4		19
Included in other comprehensive income		(18)		(84)
Settlements		(40)		(161)
Ending Balance		871		871
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	117	138	124	163
Included in Earnings			1	1
Included in other comprehensive income	(3)	(5)	(3)	(18)
Settlements	(11)	(6)	(19)	(19)
Ending Balance	103	127	103	127
Securities available for sale \| Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	54	67	55	69
Included in Earnings	(1)		(1)
Included in other comprehensive income	1	2	(3)
Purchases	3		6	3
Settlements	(1)		(4)	(3)
Transfers into Level 3			3
Ending Balance	56	69	56	69
Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	745	804	769	884
Included in Earnings	5	(1)	11	20
Purchases	19	11	39	31
Sales		(2)	(1)	(10)
Settlements	(27)	(35)	(77)	(132)
Transfers into Level 3	2		17
Transfers out of Level 3	(6)	(2)	(20)	(18)
Ending Balance	738	775	738	775
Unrealized gains/losses on assets held on Consolidated Balance Sheet	5		11	20
Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,623	1,867	1,778	1,680
Included in Earnings	(9)	167	136	312
Purchases	212	69	444	185
Sales	(97)	(308)	(495)	(382)
Transfers out of Level 3			(134)
Ending Balance	1,729	1,795	1,729	1,795
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(16)	65	103	211
Mortgage Servicing Rights \| Residential mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,349	1,620	2,310	1,078
Included in Earnings	215	135	248	505
Purchases	329	363	438	620
Issuances	7	11	17	49
Settlements	(63)	(55)	(176)	(178)
Ending Balance	2,837	2,074	2,837	2,074
Unrealized gains/losses on assets held on Consolidated Balance Sheet	215	135	248	506
Mortgage Servicing Rights \| Commercial mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,106	988	1,113	740
Included in Earnings	130	176	238	438
Purchases	10	7	27	32
Issuances	6	17	38	52
Settlements	(83)	(56)	(247)	(130)
Ending Balance	1,169	1,132	1,169	1,132
Unrealized gains/losses on assets held on Consolidated Balance Sheet	130	176	238	438
Financial derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	6	13	5	38
Included in Earnings	6	4	13	(2)
Purchases		1	3	4
Settlements	(6)	(10)	(15)	(32)
Ending Balance	6	8	6	8
Unrealized gains/losses on assets held on Consolidated Balance Sheet	7	7	16	18
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	140	213	123	285
Included in Earnings	50	(11)	168	12
Sales	2	4	5	10
Settlements	(84)	(86)	(188)	(187)
Ending Balance	108	120	108	120
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	51	(7)	173	22
Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Purchases	1		1
Transfers into Level 3	4		4
Ending Balance	5		5
Other borrowed funds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	5	3	4	3
Issuances	3		9	4
Settlements	(1)	(1)	(6)	(5)
Ending Balance	7	2	7	2
Other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	239	182	294	175
Included in Earnings	6	26	61	47
Purchases		(32)		32
Issuances	329	362	436	604
Settlements	(324)	(333)	(541)	(589)
Ending Balance	$ 250	269	250	269
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet		$ 24	$ 41	$ 39

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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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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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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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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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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