Mortgage Banking Activities, Analysis of Changes in Fair Value MSRs (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Changes in MSRs measured at fair value
Fair value, beginning of period			$ 12,959
Changes in fair value:
Net changes in valuation model inputs or assumptions	$ (360)	$ (824)	(186)	$ (1,781)
Changes due to collection/realization of expected cash flows over time	(487)	(568)	(948)	(1,059)
Total changes in fair value	(847)	(1,392)	(1,134)	(2,840)
Fair value, end of period	12,789		12,789
Carried at fair value [Member]
Changes in MSRs measured at fair value
Fair value, beginning of period	13,208	11,333	12,959	12,415
Servicing from securitizations or asset transfers (1)	436	477	1,019	843
Sales and other (2)	(8)	(22)	(55)	(22)
Net additions	428	455	964	821
Changes in fair value:
Net changes in valuation model inputs or assumptions	(360)	(824)	(186)	(1,781)
Changes due to collection/realization of expected cash flows over time	(487)	(568)	(948)	(1,059)
Total changes in fair value	(847)	(1,392)	(1,134)	(2,840)
Fair value, end of period	12,789	10,396	12,789	10,396
Carried at fair value [Member] \| Mortgage interest rates [Member]
Changes in fair value:
Net changes in valuation model inputs or assumptions	(305)	(779)	(153)	(1,863)
Carried at fair value [Member] \| Servicing and foreclosure costs [Member]
Changes in fair value:
Net changes in valuation model inputs or assumptions	(14)	(4)	13	23
Carried at fair value [Member] \| Prepayment estimates and other [Member]
Changes in fair value:
Net changes in valuation model inputs or assumptions	$ (41)	$ (41)	$ (46)	$ 59

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount of increase (decrease) in fair value from changes in the inputs, assumptions, or model used to calculate the fair value of the contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 50
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-Subparagraph (a)(4)(i)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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Amount of increase (decrease) from changes in fair value classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of increase (decrease) in fair value from changes classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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The increase (decrease) in the fair value of servicing assets that are subsequently measured at fair value.

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The net additions (reductions) in the fair value of servicing assets from the origination of mortgage servicing rights (MSRs) or disposals of servicing assets at fair value.

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No definition available.

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