Securitizations and Variable Interest Entities, Cash Flows From Sales and Securitizations Activity (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Securitizations and Variable Interest Entities Textual [Abstract]
Amount paid to third party investors to settle repurchase liabilities	$ 0	$ 0	$ 11
Amount paid to repurchase loans from securitization vehicles	7,800	8,600	9,900
Net gain from sale of asset securitization	270	701	524
Mortgage loans [Member]
Cash Flow Securitizations [Abstract]
Proceeds from securitizations and whole loan sales	193,721	228,282	252,723
Fees from servicing rights retained	3,337	3,352	3,492
Cash flows from other interests held	698	2,218	2,898
Servicing advances, net of repayments	(154)	(269)	(218)
Other financial assets [Member]
Cash Flow Securitizations [Abstract]
Proceeds from securitizations and whole loan sales	0	25	347
Fees from servicing rights retained	0	0	0
Cash flows from other interests held	1	1	1
Servicing advances, net of repayments	0	0	0
Residential Mortgage [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Amount transferred related to mortgages to unconsolidated VIE	177,800	213,600	236,600
Commercial Loan [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Net gain from sale of asset securitization	280	359	429
Amount transferred related to mortgages to unconsolidated VIE	17,900	16,700	18,300
Fair Value, Inputs, Level 3 [Member] \| Residential Mortgage [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Amount of servicing asset at fair value	1,900	2,100	2,100
Amount of liability for repurchase reserves at fair value	17	24	36
Fair Value, Inputs, Level 3 [Member] \| Commercial Loan [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Amount of servicing asset at fair value	158	166	270
Fair Value, Inputs, Level 2 [Member] \| Residential Mortgage [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Securities, at fair value	5,000	1,400	4,400
Fair Value, Inputs, Level 2 [Member] \| Commercial Loan [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Securities, at fair value	81	65	258
Non-agency securitizations and whole loan transactions [Member] \| Mortgage loans [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	3	12	26
Non-agency securitizations and whole loan transactions [Member] \| Other financial assets [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	0	0	0
Agency securitizations \| Mortgage loans [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	96	92	133
Agency securitizations \| Other financial assets [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	$ 0	$ 0	$ 0

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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 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

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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.

+ References

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

+ References

No definition available.

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Amount paid to third-party investors to settle repurchase liabilities on pools of loans.

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No definition available.

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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.

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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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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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