Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	$ 319	$ 405	$ 398	$ 614
Sales	(31)	(36)	16	(24)
Maturities	(84)	(58)	(146)	(107)
Settlements	8	31	10	20
Calls	(27)	(1)	(33)	(4)
Total	185	341	245	499
Corporate Bonds [Member] \| Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	257	80	268	91
Sales	(22)	(26)	(23)	(27)
Maturities			(4)
Settlements	(11)	(8)	(27)	(35)
Calls	(26)	(1)	(32)	(4)
Total	198	45	182	25
U.S. Government Bonds [Member] \| Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Settlements			(1)
Total			(1)
Foreign Government Bonds [Member] \| Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances			30
Total			30
RMBS [Member] \| Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances		103		103
Settlements		(5)	(2)	(9)
Total		98	(2)	94
CMBS [Member] \| Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Settlements	(2)	(1)	(3)	(8)
Calls	(1)		(1)
Total	(3)	(1)	(4)	(8)
CDOs [Member] \| Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances		23		23
Settlements	(6)	(5)	(12)	(9)
Total	(6)	18	(12)	14
State And Municipal Bonds [Member] \| Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances		32		32
Total		32		32
Equity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	38	25	63	25
Sales	(1)		(5)
Total	37	25	58	25
Trading Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances		2		2
Settlements	(1)		(1)	(2)
Total	(1)	2	(1)
Derivative Investments [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	42	165	74	373
Sales	(8)	(10)	44	3
Maturities	(84)	(58)	(142)	(107)
Total	(50)	97	(24)	269
Indexed Annuity and Universal Life Contracts [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	(18)	(25)	(37)	(35)
Settlements	28	50	56	83
Total	$ 10	$ 25	$ 19	$ 48

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Represents decreases to the amount of certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments) due to calls of investments during the period. The alternative investments represented by this item are subject to significant unobservable inputs (Level 3) for purposes of measuring fair value.

+ References

No definition available.

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- Definition

Represents decreases to the amount of certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments) due to maturities of investments during the period. The alternative investments represented by this item are subject to significant unobservable inputs (Level 3) for purposes of measuring fair value.

+ References

No definition available.

+ Details

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- Definition

Represents increases to the amount of certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments) due to issuances received from the investee during the period. The alternative investments represented by this item are subject to significant unobservable inputs (Level 3) for purposes of measuring fair value.

+ 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)(2)

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

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- Definition

Represents the net increase or decrease to the amount of certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments) due to purchases, sales, issuances, or settlements during the period. The alternative investments represented by this item are subject to significant unobservable inputs (Level 3) for purposes of measuring fair value.

+ References

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- Definition

Represents decreases to the amount of certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments) due to the sale of investments made during the period. The alternative investments represented by this item were subject to significant unobservable inputs (Level 3) for purposes of measuring fair value.

+ References

+ Details

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- Definition

Represents decreases to the amount of certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments) due to settlements (withdrawals, distributions) received from the investee during the period. The alternative investments represented by this item were subject to significant unobservable inputs (Level 3) for purposes of measuring fair value.

+ References

+ Details

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