Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring Basis Transfers Into And Out Of Level 3 [Abstract]
Transfers In to Level 3	$ 163	$ 170
Transfers Out of Level 3	(32)	(330)
Transfers In or Out of Level 3, Net	131	(160)
Corporate Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Transfers Into And Out Of Level 3 [Abstract]
Transfers In to Level 3	158	150
Transfers Out of Level 3	(6)	(266)
Transfers In or Out of Level 3, Net	152	(116)
RMBS [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Transfers Into And Out Of Level 3 [Abstract]
Transfers Out of Level 3		(55)
Transfers In or Out of Level 3, Net		(55)
Hybrid And Redeemable Preferred Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Transfers Into And Out Of Level 3 [Abstract]
Transfers In to Level 3	5	20
Transfers Out of Level 3	(26)	(9)
Transfers In or Out of Level 3, Net	$ (21)	$ 11

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Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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- Definition

This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

+ References

+ Details

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