Variable Interest Entities - Securitization Activity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Residential mortgage-backed securities \| Level 2
All cash flows during the period:
Proceeds from new securitizations	$ 1,300	$ 330
Residential mortgage-backed securities \| Level 3
All cash flows during the period:
Proceeds from new securitizations		21
Mortgage-backed securities, Commercial \| Level 2
All cash flows during the period:
Proceeds from new securitizations	3,400	2,000
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability \| Residential mortgage-backed securities
Securitization activity [Abstract]
Principal securitized	1,312	356
All cash flows during the period:
Proceeds from new securitizations	1,317	351
Servicing fees collected	146	139
Purchases of previously transferred financial assets (or the underlying collateral)	0	3
Cash flows received on interests	70	44
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability \| Mortgage-backed securities, Commercial
Securitization activity [Abstract]
Principal securitized	3,375	2,027
All cash flows during the period:
Proceeds from new securitizations	3,369	2,044
Servicing fees collected	1	1
Purchases of previously transferred financial assets (or the underlying collateral)	0	0
Cash flows received on interests	$ 79	$ 62

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

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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