Variable Interest Entities - Securitization Activity (Details) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Residential mortgage \| Level 2
All cash flows during the period:
Proceeds from new securitizations	$ 3,000,000,000	$ 2,400,000,000	$ 1,400,000,000
Residential mortgage \| Level 3
All cash flows during the period:
Proceeds from new securitizations	59,000,000	185,000,000
Commercial and other \| Level 2
All cash flows during the period:
Proceeds from new securitizations	12,000,000,000	11,400,000,000	11,300,000,000
Commercial and other \| Level 3
All cash flows during the period:
Proceeds from new securitizations	43,000,000	130,000,000
Commercial and other \| Cash
All cash flows during the period:
Proceeds from new securitizations			207,000,000
Commercial and other \| Cash \| Level 2
All cash flows during the period:
Proceeds from new securitizations	0
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability \| Residential mortgage
Securitization activity [Abstract]
Principal securitized	3,008,000,000	2,558,000,000	1,404,000,000
All cash flows during the period:
Proceeds from new securitizations	3,022,000,000	2,569,000,000	1,410,000,000
Servicing fees collected	528,000,000	557,000,000	576,000,000
Purchases of previously transferred financial assets (or the underlying collateral)	3,000,000	121,000,000	294,000,000
Cash flows received on interests	$ 407,000,000	$ 179,000,000	$ 156,000,000
Weighted-average life	4 years 2 months 12 days	5 years 10 months 24 days	3 years 10 months 24 days
Discount rate	2.90%	3.40%	2.50%
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability \| Commercial and other
Securitization activity [Abstract]
Principal securitized	$ 11,933,000,000	$ 11,911,000,000	$ 11,318,000,000
All cash flows during the period:
Proceeds from new securitizations	12,011,000,000	12,079,000,000	11,507,000,000
Servicing fees collected	3,000,000	4,000,000	5,000,000
Purchases of previously transferred financial assets (or the underlying collateral)	0	0	0
Cash flows received on interests	$ 597,000,000	$ 578,000,000	$ 325,000,000
Weighted-average life	6 years 2 months 12 days	6 years 6 months	8 years 3 months 18 days
Discount rate	4.10%	4.80%	3.20%
Cash \| Commercial and other
All cash flows during the period:
Proceeds from new securitizations		$ 568,000,000

The principal amount of financial assets transferred during the period in securitizations accounted for as sales.

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- Definition

Securitization activity.

+ References

No definition available.

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- Definition

Discount rate which is used to value residual cash flows generated by financial assets of the securitization, asset-backed financing arrangement, or similar transfer for initial fair value measurement.

+ 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 (c)(1)
-URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107207-111719

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- References

No definition available.

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- Definition

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)
-URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107207-111719

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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
-URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107207-111719

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- Definition

Cash flows between transferor and a transferee attributable to the transferor's interests related to 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=51814546&loc=d3e107207-111719

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- Definition

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=51814546&loc=d3e107207-111719

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- Definition

Weighted average life of securitized assets for initial fair value measurement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (c)(2)
-URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107207-111719

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