Securitizations and Variable Interest Entities, Cash Flows From Sales and Securitization Activity (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Securitizations and Variable Interest Entities Textual [Abstract]
Amount paid to repurchase loans from securitization vehicles	$ 1,600	$ 2,000	$ 3,900	$ 4,900
Net gain from sale of assets securitizations	393	100	525	295
Residential Mortgage [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Amount transferred related to mortgages to unconsolidated VIE	49,700	65,000	105,200	102,300
Mortgage loans [Member]
Cash Flow Securitizations [Abstract]
Proceeds from securitizations and whole loan sales	52,824	66,455	111,081	111,471
Fees from servicing rights retained	840	864	1,694	1,745
Cash flows from other interests held	641	627	1,475	1,034
Servicing advances, net of repayments	(20)	(39)	(162)	(107)
Other financial assets [Member]
Cash Flow Securitizations [Abstract]
Proceeds from securitizations and whole loan sales	4	83	25	133
Fees from servicing rights retained	0	0	0	0
Cash flows from other interests held	0	0	0	1
Servicing advances, net of repayments	0	0	0	0
Commercial Loan [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Net gain from sale of assets securitizations	80	58	176	193
Amount transferred related to mortgages to unconsolidated VIE	3,300	1,800	6,600	9,900
Non-agency securitizations and whole loan transactions [Member] \| Mortgage loans [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	5	15	7	18
Non-agency securitizations and whole loan transactions [Member] \| Other financial assets [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	0	0	0	0
Agency securitizations \| Mortgage loans [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	23	35	46	82
Agency securitizations \| Other financial assets [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	$ 0	$ 0	0	0
Fair Value, Inputs, Level 3 [Member] \| Residential Mortgage [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Amount of servicing asset at fair value			957	764
Amount of liability for repurchase reserves at fair value			14	15
Fair Value, Inputs, Level 3 [Member] \| Commercial Loan [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Amount of servicing asset at fair value			82	135
Fair Value, Inputs, Level 2 [Member] \| Residential Mortgage [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Securities, at fair value			3,500	3,200
Fair Value, Inputs, Level 2 [Member] \| Commercial Loan [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Securities, at fair value			$ 65	$ 86

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Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (d)(1)
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- Definition

Cash Flows between a transferor and a transferee attributable to purchases of previously transferred financial assets (or its underlying collateral) related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph b
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- Definition

Cash flows between transferor and transferee in payment of service fees in advance, prior to or in contemplation of a securitization, asset-backed financing arrangement, or similar transfer in which the transferor will have continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph d
-URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107207-111719

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Cash Flows between a transferee and a transferor attributable to servicing fees related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph d
-URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107207-111719

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- Definition

Cash flows between transferee and transferor in payment of the transferor's beneficial interest related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction.

+ References

No definition available.

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- Definition

A gain (loss) realized on a transfer, accounted for as a sale, of all or a portion of financial assets in which the transferor surrenders control and receives consideration other than a beneficial interest in the assets transferred. Reflects the amount of sales proceeds in excess of, or deficient from, the sum of the carrying amounts of transferred financial assets plus transaction costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7,9)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Amount paid to GNMA early pool buy-out loans due to exercise of repurchase option.

+ References

No definition available.

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- Definition

Carrying value of assets transferred in a securitization or asset-backing financing arrangement or a whole loan sale, accounted for as a sale.

+ References

No definition available.

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The increase during the reporting period in liability for mortgage repurchase reserves that are measured using Level 3 measurements. This increase is related to new servicing rights that are created when mortgages are sold or transferred.

+ References

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- Definition

The increase during the reporting period of the amount of investment in debt and equity securities categorized either available-for-sale or trading, relating to loan securitizations, that are measured using Level 2 measurements.

+ References

No definition available.

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Securitizations and Variable Interest Entities Textual Abstract.

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The increase during the reporting period in the 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, relating to loan securitizations, that are measured using Level 3 measurements.

+ References

No definition available.

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