Securitizations and Variable Interest Entities, Transfers with Continuing Involvement (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Residential mortgages [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Net gains (losses) on sale	$ 52	$ 14
Asset balances sold	47,857	34,103
Residential mortgages [Member] \| Fair value, inputs, level 3 [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Servicing rights recognized	446	320
Liability for repurchase losses recognized	3	3
Residential mortgages [Member] \| Fair value, inputs, level 2 [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Securities recognized	2,313	912
Commercial mortgages [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Net gains (losses) on sale	69	47
Asset balances sold	2,728	2,702
Commercial mortgages [Member] \| Fair value, inputs, level 3 [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Servicing rights recognized	34	26
Liability for repurchase losses recognized	0	0
Commercial mortgages [Member] \| Fair value, inputs, level 2 [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Securities recognized	$ 62	$ 0

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13))
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(a))
-URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(7)(c))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(9)(a))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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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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- Definition

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

[Line Items] for Quantitative information related to a transferor's continuing involvement with financial assets transferred to a transferee in a securitization, asset-backed financing arrangement, or similar transfer.

+ References

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- Definition

The fair value of debt and equity securities recognized upon transfer of financial assets, that are measured using Level 2 measurements.

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The fair value of an asset recognized upon transfer of financial assets, representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs, that are measured using Level 3 measurements.

+ References

No definition available.

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