Securitizations and Variable Interest Entities, Cash Flows From Sales and Securitization Activity (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Securitizations and Variable Interest Entities Textual [Abstract]
Amount paid to repurchase loans from securitization vehicles	$ 1,300	$ 1,800	$ 3,200	$ 4,700
Net gain from sale of assets securitizations	119	54	180	112
Mortgage loans [Member]
Cash Flow Securitizations [Abstract]
Proceeds from securitizations and whole loan sales	39,697	51,990	76,204	102,577
Fees from servicing rights retained	786	830	1,566	1,675
Cash flows from other interests held	133	168	244	353
Servicing advances, net of repayments	(54)	(7)	(93)	(43)
Mortgage loans [Member] \| Not government insured/guaranteed [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	1	1	1	2
Mortgage loans [Member] \| Agency securitizations [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	27	19	44	52
Other financial assets [Member]
Cash Flow Securitizations [Abstract]
Cash flows from other interests held		1		1
Residential mortgage [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Amount transferred related to mortgages to unconsolidated VIE	36,700	47,700	70,800	95,000
Commercial loan [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Net gain from sale of assets securitizations	74	60	121	129
Amount transferred related to mortgages to unconsolidated VIE	$ 3,400	$ 4,400	6,100	7,500
Fair Value, Inputs, Level 2 [Member] \| Residential mortgage [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Securities, at fair value			3,400	1,800
Fair Value, Inputs, Level 2 [Member] \| Commercial loan [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Securities, at fair value			0	208
Fair Value, Inputs, Level 3 [Member] \| Residential mortgage [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Amount of servicing asset at fair value			707	988
Amount of liability for repurchase reserves at fair value			8	7
Fair Value, Inputs, Level 3 [Member] \| Commercial loan [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Amount of servicing asset at fair value			$ 59	$ 73

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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).

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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

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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).

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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.

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No definition available.

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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.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount paid to GNMA early pool buy-out loans due to exercise of repurchase option.

+ References

No definition available.

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Cash flows between transferor and transferee for net payment (repayment) of servicing fee advances 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).

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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

No definition available.

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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.

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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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