Variable Interest Entities (Consolidating Entities) (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Variable interest entity, not primary beneficiary [Member] \| Sponsored hedge funds and private equity funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Variable interest entity, nonconsolidated, carrying amount, assets	$ 89	$ 66
Variable interest entity, not primary beneficiary [Member] \| Affordable housing partnerships [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Variable interest entity, nonconsolidated, carrying amount, assets	504	495
Consolidated investment entities [Member] \| CLO [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Number of variable interest or voting rights entities consolidated	3	3
Value of variable interest or voting rights entities consolidated	1,700	1,300
Number of variable interest or voting rights entities liquidated	1	2
Value of variable interest or voting rights entities liquidated	300	360
Consolidated investment entities [Member] \| Property Fund [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Number of variable interest or voting rights entities consolidated	2	2
Value of variable interest or voting rights entities consolidated	260	206
Number of variable interest or voting rights entities liquidated	1	1
Value of variable interest or voting rights entities liquidated	65	111
Consolidated investment entities [Member] \| Net investment income [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total net losses recognized in net investment income related to changes in the fair value of financial assets and liabilities for which the fair value options was elected	$ (46)	$ 28	$ (85)

Number of variable interest or voting rights entities consolidated

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- Definition

Number of variable interest or voting rights entities liquidated

+ References

No definition available.

+ Details

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- Definition

Value of variable interest or voting rights entities consolidated during the period

+ References

No definition available.

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Value of variable interest or voting rights entities liquidated

+ References

No definition available.

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- Definition

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 30

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

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- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685

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