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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 7,142	$ 6,213	$ 7,252	$ 5,882
Included in Earnings	199	390	308	802
Included in other comprehensive income	13	(53)		(81)
Purchases	211	304	393	469
Sales	(370)	(94)	(441)	(114)
Issuances	24	31	42	73
Settlements	(228)	(232)	(425)	(469)
Transfers into Level 3	8	9	21	14
Transfers out of Level 3	(12)	(22)	(163)	(30)
Ending Balance	6,987	6,546	6,987	6,546
Unrealized gains/losses on assets held on Consolidated Balance Sheet	186	389	277	806
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	331	395	421	463
Included in Earnings	110	32	173	44
Purchases
Sales	1	3	3	6
Issuances	92	173	113	246
Settlements	(150)	(205)	(326)	(361)
Ending Balance	384	398	384	398
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	101	29	164	33
Fair Value Additional Information [Abstract]
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities	89	358	135	758
Net unrealized gains (losses) relating to Level 3 assets and liabilities	85	360	113	773
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	242	108	243	81
Included in Earnings	(4)	(1)		(2)
Purchases	3	8	9	45
Sales	(41)	(30)	(42)	(32)
Settlements	(2)	(4)	(7)	(9)
Transfers into Level 3		9	3	14
Transfers out of Level 3	(7)	(7)	(15)	(14)
Ending Balance	191	83	191	83
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(3)	(1)	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	32	45	33	49
Included in Earnings	1			(4)
Sales
Settlements	(8)	(7)	(8)	(7)
Ending Balance	25	38	25	38
Unrealized gains/losses on assets held on Consolidated Balance Sheet				(4)
Loans held for sale \| Other consumer loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Sales
Securities available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	964	1,240	1,001	1,332
Included in Earnings	5	8	9	16
Included in other comprehensive income	13	(53)		(81)
Purchases	3	2	3	3
Sales
Settlements	(43)	(64)	(74)	(137)
Transfers into Level 3			3
Ending Balance	942	1,133	942	1,133
Securities available for sale \| Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	787	1,019	819	1,097
Included in Earnings	4	7	8	15
Included in other comprehensive income	14	(43)	4	(66)
Settlements	(37)	(58)	(63)	(121)
Ending Balance	768	925	768	925
Securities available for sale \| Commercial mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3	3	3	3
Included in Earnings
Included in other comprehensive income
Ending Balance	3	3	3	3
Securities available for sale \| Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	121	152	124	163
Included in Earnings	1	1	1	1
Included in other comprehensive income	(1)	(9)		(13)
Settlements	(4)	(6)	(8)	(13)
Ending Balance	117	138	117	138
Securities available for sale \| Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	53	66	55	69
Included in Earnings
Included in other comprehensive income		(1)	(4)	(2)
Purchases	3	2	3	3
Sales
Settlements	(2)		(3)	(3)
Transfers into Level 3			3
Ending Balance	54	67	54	67
Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	757	851	769	884
Included in Earnings	3	10	6	21
Purchases	11	7	20	20
Sales	(1)	(1)	(1)	(8)
Settlements	(28)	(48)	(50)	(97)
Transfers into Level 3	8		15
Transfers out of Level 3	(5)	(15)	(14)	(16)
Ending Balance	745	804	745	804
Unrealized gains/losses on assets held on Consolidated Balance Sheet	3	9	6	21
Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,835	1,751	1,778	1,680
Included in Earnings	24	92	145	145
Purchases	92	87	232	116
Sales	(328)	(63)	(398)	(74)
Transfers out of Level 3			(134)
Ending Balance	1,623	1,867	1,623	1,867
Unrealized gains/losses on assets held on Consolidated Balance Sheet	2	94	119	146
Mortgage Servicing Rights \| Residential mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,232	1,322	2,310	1,078
Included in Earnings	81	163	33	370
Purchases	91	181	109	257
Issuances	5	17	10	38
Settlements	(60)	(63)	(113)	(123)
Ending Balance	2,349	1,620	2,349	1,620
Unrealized gains/losses on assets held on Consolidated Balance Sheet	80	163	33	371
Mortgage Servicing Rights \| Commercial mortgage loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,061	886	1,113	740
Included in Earnings	99	111	108	262
Purchases	9	17	17	25
Issuances	19	14	32	35
Settlements	(82)	(40)	(164)	(74)
Ending Balance	1,106	988	1,106	988
Unrealized gains/losses on assets held on Consolidated Balance Sheet	100	111	108	262
Financial derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	19	10	5	38
Included in Earnings	(10)	7	7	(6)
Purchases	2	2	3	3
Settlements	(5)	(6)	(9)	(22)
Ending Balance	6	13	6	13
Unrealized gains/losses on assets held on Consolidated Balance Sheet	4	13	10	12
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	97	234	123	285
Included in Earnings	79	18	118	23
Sales	1	3	3	6
Settlements	(37)	(42)	(104)	(101)
Ending Balance	140	213	140	213
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	80	19	122	18
Other borrowed funds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	5	3	4	3
Issuances	3	2	6	4
Settlements	(3)	(2)	(5)	(4)
Ending Balance	5	3	5	3
Other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	229	158	294	175
Included in Earnings	31	14	55	21
Purchases
Issuances	89	171	107	242
Settlements	(110)	(161)	(217)	(256)
Ending Balance	239	182	239	182
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	$ 21	$ 10	$ 42	$ 15

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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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-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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-Topic 820
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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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