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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	$ 237	$ 250	$ 588	$ 692
Sales	(148)	(55)	34	(143)
Maturities	(131)	(88)	(367)	(136)
Settlements	(33)		(76)	(22)
Calls	(26)	(78)	(134)	(135)
Total	(101)	29	45	256
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	167	92	367	381
Sales	(114)	(20)	(179)	(19)
Maturities	(19)	(18)	(66)	(22)
Settlements	(43)	(50)	(170)	(133)
Calls	(26)	(78)	(134)	(135)
Total	(35)	(74)	(182)	72
ABS [Member] | Fixed maturity AFS securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances				15
Settlements				(1)
Total				14
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		(2)		8
Total		(2)		8
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	6	51	10	66
Total	6	51	10	66
CMBS [Member] | Fixed maturity AFS securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances		31	55	31
Sales				(2)
Settlements	(1)	(1)	(1)	(2)
Total	(1)	30	54	27
CLOs [Member] | Fixed maturity AFS securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	15	35	33	115
Settlements				(2)
Total	15	35	33	113
Equity AFS securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	10		18	4
Sales	(1)	(4)	(3)	(4)
Total	9	(4)	15
Trading securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances		7	2	6
Sales	(10)		(27)
Settlements		(1)	(1)	(1)
Total	(10)	6	(26)	5
Derivative investments [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	50	47	145	132
Sales	(23)	(46)	243	(133)
Maturities	(112)	(70)	(301)	(114)
Total	(85)	(69)	87	(115)
Indexed annuity and embedded derivatives [Member] | Other assets [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	3		3
Total	3		3
Indexed annuity and embedded derivatives [Member] | Future contract benefits [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	(14)	(13)	(45)	(58)
Settlements	11	54	96	109
Total	$ (3)	41	$ 51	51
Credit default swaps [Member] | Other liabilities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Sales		15		15
Total		$ 15		$ 15

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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 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.

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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 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.

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section 50
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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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