Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) - Fair Value, Measurements, Recurring - Level 3 - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 6,475	$ 8,830
Included in earnings	466	446
Included in other comprehensive income	(25)	178
Purchases	750	589
Sales	(424)	(5,943)
Issuances	101	5,028
Settlements	(1,137)	(1,698)
Transfers Into Level 3	24	23
Transfers Out of Level 3	(73)	(978)
Ending Balance	6,157	6,475
Unrealized gains or (losses) on assets held on Consolidated Balance Sheet	280	198
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	531	433
Included in earnings	(38)	318
Purchases	12
Sales	12	3
Issuances	167	245
Settlements	(351)	(466)
Transfer out of Level 3		(2)
Ending Balance	333	531
Unrealized gains or (losses) on liabilities held on Consolidated Balance Sheet	(29)	323
Fair Value Additional Information [Abstract]
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities	504	128
Net unrealized gains (losses) relating to Level 3 assets and liabilities	309	(125)
Loans Held For Sale \| Residential Mortgage
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3	2
Purchases	4	8
Sales	(3)	(1)
Transfers Into Level 3	14	10
Transfers Out of Level 3	(16)	(16)
Ending Balance	2	3
Loans Held For Sale \| Commercial Mortgage
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	107	1,400
Included in earnings		81
Sales		(5,278)
Issuances		4,885
Settlements	(20)	(258)
Transfers Out of Level 3		(723)
Ending Balance	87	107
Unrealized gains or (losses) on assets held on Consolidated Balance Sheet	1	4
Available-for-sale Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3,080	3,723
Included in earnings	63	101
Included in other comprehensive income	(25)	178
Purchases	7	13
Sales		(71)
Settlements	(634)	(864)
Transfers Out of Level 3	(5)
Ending Balance	2,486	3,080
Unrealized gains or (losses) on assets held on Consolidated Balance Sheet		(1)
Available-for-sale Securities \| Residential mortgage-backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,661	3,254
Included in earnings	53	77
Included in other comprehensive income	(24)	137
Sales		(33)
Settlements	(562)	(774)
Ending Balance	2,128	2,661
Unrealized gains or (losses) on assets held on Consolidated Balance Sheet		(1)
Available-for-sale Securities \| Commercial Mortgage Backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Included in earnings		12
Sales		(12)
Available-for-sale Securities \| Asset backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	332	403
Included in earnings	5	12
Included in other comprehensive income	(7)	22
Sales		(25)
Settlements	(56)	(80)
Ending Balance	274	332
Available-for-sale Securities \| Other debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	87	66
Included in earnings	5
Included in other comprehensive income	6	19
Purchases	7	13
Sales		(1)
Settlements	(16)	(10)
Transfers Out of Level 3	(5)
Ending Balance	84	87
Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	298	335
Included in earnings	13
Purchases	102	97
Sales	(25)	(28)
Settlements	(74)	(68)
Transfers Into Level 3	10	13
Transfers Out of Level 3	(52)	(51)
Ending Balance	272	298
Unrealized gains or (losses) on assets held on Consolidated Balance Sheet	2	(7)
Equity Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,036	1,331
Included in earnings	204	239
Purchases	411	214
Sales	(396)	(565)
Transfers Out of Level 3		(183)
Ending Balance	1,255	1,036
Unrealized gains or (losses) on assets held on Consolidated Balance Sheet	110	145
Mortgage Servicing Rights \| Residential Mortgage
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,164	1,182
Included in earnings	90	(83)
Purchases	129	185
Issuances	44	55
Settlements	(170)	(175)
Ending Balance	1,257	1,164
Unrealized gains or (losses) on assets held on Consolidated Balance Sheet	83	(79)
Mortgage Servicing Rights \| Commercial Mortgage
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	668	576
Included in earnings	51	46
Purchases	93	69
Issuances	57	88
Settlements	(143)	(111)
Ending Balance	726	668
Unrealized gains or (losses) on assets held on Consolidated Balance Sheet	51	45
Trading Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2	2
Ending Balance	2	2
Financial Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	10	40
Included in earnings	59	39
Purchases	4	3
Settlements	(48)	(67)
Transfers Out of Level 3		(5)
Ending Balance	25	10
Unrealized gains or (losses) on assets held on Consolidated Balance Sheet	47	67
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	487	414
Included in earnings	(53)	293
Sales	12	3
Settlements	(178)	(221)
Transfer out of Level 3		(2)
Ending Balance	268	487
Unrealized gains or (losses) on liabilities held on Consolidated Balance Sheet	(42)	297
Other Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	107	239
Included in earnings	(14)	23
Settlements	(48)	(155)
Ending Balance	45	107
Unrealized gains or (losses) on assets held on Consolidated Balance Sheet	(14)	24
Other Borrowed Funds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	11	10
Issuances	64	72
Settlements	(68)	(71)
Ending Balance	7	11
Other Liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	33	9
Included in earnings	15	25
Purchases	12
Issuances	103	173
Settlements	(105)	(174)
Ending Balance	58	33
Unrealized gains or (losses) on liabilities held on Consolidated Balance Sheet	$ 13	$ 26

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

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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 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 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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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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