Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) - Fair Value, Measurements, Recurring [Member] - Level 3 [Member] - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 6,157	$ 6,475
Included in earnings	(26)	216
Included in other comprehensive income	4	9
Purchases	94	155
Sales	(139)	(23)
Issuances	14	30
Settlements	(271)	(305)
Transfers Into Level 3	5	4
Transfers out of Level 3	(11)	(15)
Ending Balance	5,827	6,546
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(96)	192
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	333	531
Included in earnings	39	12
Purchases		12
Sales	2	3
Issuances	16	24
Settlements	(92)	(94)
Ending Balance	298	488
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	43	7
Fair Value Additional Information [Abstract]
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities	(65)	204
Net unrealized gains (losses) relating to Level 3 assets and liabilities	(139)	185
Loans Held For Sale [Member] \| Residential Mortgage [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2	3
Purchases	1	1
Sales	(1)	(1)
Transfers Into Level 3	3	2
Transfers out of Level 3	(3)	(3)
Ending Balance	2	2
Loans Held For Sale [Member] \| Commercial Mortgages [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	87	107
Included in earnings	1
Settlements	(15)	(15)
Ending Balance	73	92
Unrealized gains/losses on assets held on Consolidated Balance Sheet	1
Available-for-sale Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,486	3,080
Included in earnings	18	23
Included in other comprehensive income	4	9
Purchases	1	2
Settlements	(116)	(154)
Ending Balance	2,393	2,960
Available-for-sale Securities [Member] \| Asset backed [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	274	332
Included in earnings		(1)
Included in other comprehensive income	2	5
Settlements	(10)	(15)
Ending Balance	266	321
Available-for-sale Securities [Member] \| Residential Mortgage-backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,128	2,661
Included in earnings	18	19
Included in other comprehensive income	2	3
Settlements	(106)	(138)
Ending Balance	2,042	2,545
Available-for-sale Securities [Member] \| Other [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	84	87
Included in earnings		5
Included in other comprehensive income		1
Purchases	1	2
Settlements		(1)
Ending Balance	85	94
Loans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	272	298
Included in earnings	3	2
Purchases	20	37
Sales	(3)	(7)
Settlements	(14)	(18)
Transfers Into Level 3	2	2
Transfers out of Level 3	(8)	(12)
Ending Balance	272	302
Unrealized gains/losses on assets held on Consolidated Balance Sheet	1	2
Equity Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,255	1,036
Included in earnings	52	26
Purchases	45	82
Sales	(135)	(15)
Ending Balance	1,217	1,129
Unrealized gains/losses on assets held on Consolidated Balance Sheet		25
Mortgage Servicing Rights [Member] \| Residential Mortgage [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,257	1,164
Included in earnings	(106)	107
Purchases	6	9
Issuances	7	13
Settlements	(33)	(37)
Ending Balance	1,131	1,256
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(106)	105
Mortgage Servicing Rights [Member] \| Commercial Mortgages [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	726	668
Included in earnings	(33)	48
Purchases	19	23
Issuances	7	17
Settlements	(38)	(33)
Ending Balance	681	723
Unrealized gains/losses on assets held on Consolidated Balance Sheet	(33)	48
Trading Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2	2
Ending Balance	2	2
Financial Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	25	10
Included in earnings	39	7
Purchases	2	1
Settlements	(10)	(6)
Ending Balance	56	12
Unrealized gains/losses on assets held on Consolidated Balance Sheet	41	9
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	268	487
Included in earnings	30	10
Sales	2	3
Settlements	(70)	(63)
Ending Balance	230	437
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	34	5
Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	45	107
Included in earnings		3
Settlements	(45)	(42)
Ending Balance		68
Unrealized gains/losses on assets held on Consolidated Balance Sheet		3
Other Borrowed Funds [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	7	11
Issuances	14	19
Settlements	(15)	(21)
Ending Balance	6	9
Other liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	58	33
Included in earnings	9	2
Purchases		12
Issuances	2	5
Settlements	(7)	(10)
Ending Balance	62	42
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet	$ 9	$ 2

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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 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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