Variable Interest Entities - Securitization Activity (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Residential mortgage-backed securities \| Level 2
All cash flows during the period:
Proceeds from new securitizations	$ 385	$ 312	$ 1,700	$ 642
Residential mortgage-backed securities \| Level 3
All cash flows during the period:
Proceeds from new securitizations		0		21
Mortgage-backed securities, Commercial \| Cash
All cash flows during the period:
Proceeds from new securitizations		280		280
Mortgage-backed securities, Commercial \| Level 2
All cash flows during the period:
Proceeds from new securitizations	2,700	2,300	6,000	4,300
Mortgage-backed securities, Commercial \| Level 3
All cash flows during the period:
Proceeds from new securitizations	38	130	38	130
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability \| Residential mortgage-backed securities
Securitization activity [Abstract]
Principal securitized	380	304	1,692	660
All cash flows during the period:
Proceeds from new securitizations	385	312	1,702	663
Servicing fees collected	134	137	280	276
Purchases of previously transferred financial assets (or the underlying collateral)	1	64	1	67
Cash flows received on interests	116	41	186	85
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability \| Mortgage-backed securities, Commercial
Securitization activity [Abstract]
Principal securitized	2,676	2,612	6,051	4,639
All cash flows during the period:
Proceeds from new securitizations	2,689	2,664	6,058	4,708
Servicing fees collected	1	1	2	2
Purchases of previously transferred financial assets (or the underlying collateral)	0	0	0	0
Cash flows received on interests	$ 128	$ 397	$ 207	$ 459

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

No definition available.

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- Definition

Securitization activity.

+ References

No definition available.

+ Details

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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 b

-URI http://asc.fasb.org/extlink&oid=13989330&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

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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=13989330&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=13989330&loc=d3e107207-111719

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