Mortgage Banking Activities, Analysis of Changes in Amortized MSRs (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Changes in amortized MSRs
Amortization	$ (65)	$ (67)	$ (198)	$ (202)
Amortized [Member]
Changes in amortized MSRs
Balance, beginning of period	1,399	1,353	1,406	1,308
Purchases	31	18	75	63
Servicing from securitizations or asset transfers	41	69	123	204
Amortization	(65)	(67)	(198)	(202)
Balance, end of period	1,406	1,373	1,406	1,373
Fair value of amortized MSRs:
Beginning of period	1,989	1,620	1,956	1,680
End of period	1,990	1,627	1,990	1,627
Commercial mortgage servicing [Member] \| Amortized [Member]
Mortgage Banking Activities (Textual) [Abstract]
Valuation allowance	$ 0	$ 0	$ 0	$ 0

The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Fair value of 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
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7516967&loc=d3e66267-113978

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- Definition

Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss.

+ References

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- Definition

Fair value of amortized mortgage servicing rights abstract.

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- Definition

Mortgage Banking Activities Textual Abstract.

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- Definition

Amortized carrying amount (balance) before valuation allowance as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

No definition available.

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- Definition

The increase (decrease) during the reporting period in the cumulative value of servicing rights. Increases are the result of new servicing rights that are created from transfers of financial assets, excluding purchases. Decreases are reductions due to MSRs that were elected to carry at fair value.

+ References

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- Definition

The value of new servicing assets acquired or created during the current period through purchases.

+ References

No definition available.

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