Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Transfers Into Level 3	$ 8
Transfers out of Level 3	(8)
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	5,687	$ 6,474	$ 6,157	$ 6,475
Included in earnings	(42)	176	(204)	543
Included in other comprehensive income	(6)	(3)	20	16
Purchases	220	163	569	478
Sales	(53)	(277)	(251)	(405)
Issuances	23	28	52	74
Settlements	(271)	(274)	(770)	(870)
Transfers Into Level 3	10	13	17	18
Transfers out of Level 3	(18)	(31)	(40)	(60)
Ending Balance	5,550	6,269	5,550	6,269
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(65)	90	(318)	394
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	304	438	333	531
Included in earnings	22	30	92	12
Purchases	16		16	12
Sales	4	5	7	10
Issuances	26	76	105	142
Settlements	(55)	(143)	(236)	(301)
Ending Balance	317	406	317	406
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	21	32	85	13
Fair Value Additional Information [Abstract]
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities	(64)	146	(296)	531
Net unrealized gains (losses) relating to Level 3 assets and liabilities	(86)	58	(403)	381
Loans Held For Sale [Member] \| Residential Mortgage [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2	4	2	3
Purchases	3	2	5	4
Sales		(1)	(1)	(2)
Settlements	(1)		(1)
Transfers Into Level 3		5	12	10
Transfers out of Level 3		(7)	(13)	(12)
Ending Balance	4	3	4	3
Loans Held For Sale [Member] \| Commercial Mortgages [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	73	91	87	107
Included in earnings		1	2
Settlements	(1)	(3)	(17)	(18)
Ending Balance	72	89	72	89
Unrealized gains/losses on assets held on Consolidated Balance Sheet			2
Available-for-sale Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,317	2,804	2,486	3,080
Included in earnings	26	20	64	45
Included in other comprehensive income	(6)	(3)	20	16
Purchases	6	2	9	6
Sales			(3)
Settlements	(161)	(168)	(394)	(492)
Transfers out of Level 3		(5)		(5)
Ending Balance	2,182	2,650	2,182	2,650
Available-for-sale Securities [Member] \| Residential Mortgage-backed Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,976	2,405	2,128	2,661
Included in earnings	23	18	59	38
Included in other comprehensive income	(3)	(1)	18	7
Settlements	(143)	(154)	(352)	(438)
Ending Balance	1,853	2,268	1,853	2,268
Available-for-sale Securities [Member] \| Asset backed [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	261	308	274	332
Included in earnings	2	2	4	2
Included in other comprehensive income		(3)	6	1
Purchases	1		1
Settlements	(12)	(14)	(33)	(42)
Ending Balance	252	293	252	293
Available-for-sale Securities [Member] \| Other [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	80	91	84	87
Included in earnings	1		1	5
Included in other comprehensive income	(3)	1	(4)	8
Purchases	5	2	8	6
Sales			(3)
Settlements	(6)		(9)	(12)
Transfers out of Level 3		(5)		(5)
Ending Balance	77	89	77	89
Loans [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	259	282	272	298
Included in earnings	5	4	10	9
Purchases	93	25	126	80
Sales	(7)	(18)	(18)	(27)
Issuances	1
Settlements	(14)	(1)	(39)	(44)
Transfers Into Level 3	2	8	5	8
Transfers out of Level 3	(10)	(19)	(27)	(43)
Ending Balance	329	281	329	281
Unrealized gains/losses on assets held on Consolidated Balance Sheet	4		6	1
Equity Investments [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,323	1,167	1,255	1,036
Included in earnings	48	81	104	169
Purchases	65	52	260	213
Sales	(46)	(258)	(229)	(376)
Ending Balance	1,390	1,042	1,390	1,042
Unrealized gains/losses on assets held on Consolidated Balance Sheet	50	18	53	77
Mortgage Servicing Rights [Member] \| Residential Mortgage [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	997	1,297	1,257	1,164
Included in earnings	(100)	41	(362)	188
Purchases	22	66	87	113
Issuances	9	12	23	35
Settlements	(40)	(46)	(117)	(130)
Ending Balance	888	1,370	888	1,370
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(97)	41	(353)	180
Mortgage Servicing Rights [Member] \| Commercial Mortgages [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	630	748	726	668
Included in earnings	(38)	23	(126)	104
Purchases	25	16	76	60
Issuances	13	16	29	39
Settlements	(35)	(37)	(110)	(105)
Ending Balance	595	766	595	766
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(38)	23	(126)	104
Trading Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		2	2	2
Settlements			(2)
Ending Balance		2		2
Derivative [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	86	16	25	10
Included in earnings	17	9	104	33
Purchases	6		6	2
Settlements	(19)	(17)	(45)	(37)
Ending Balance	90	8	90	8
Unrealized gains/losses on assets held on Consolidated Balance Sheet	16	11	100	37
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	221	384	268	487
Included in earnings	8	26	58	3
Sales	4	5	5	10
Settlements	(27)	(73)	(125)	(158)
Ending Balance	206	342	206	342
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	13	32	65	5
Other Assets [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		63	45	107
Included in earnings		(3)		(5)
Settlements		(2)	(45)	(44)
Ending Balance		58		58
Unrealized gains/losses on assets held on Consolidated Balance Sheet		(3)		(5)
Other Borrowed Funds [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	5	7	7	11
Issuances	13	18	39	50
Settlements	(12)	(16)	(40)	(52)
Ending Balance	6	9	6	9
Other liabilities [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	78	47	58	33
Included in earnings	14	4	34	9
Purchases	16		16	12
Sales			2
Issuances	13	58	66	92
Settlements	(16)	(54)	(71)	(91)
Ending Balance	105	$ 55	105	55
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	$ 8		$ 20	$ 8

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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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Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets 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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Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those 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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Amount of gain (loss) recognized in the income statement for 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 other comprehensive income (loss) for 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 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 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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