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Fair Value Measurements - Fair Value Option (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Changes in fair value of assets using fair value option	$ 0	$ 4	$ (4)
Fixed maturities, at fair value using the fair value option	41	211
ABS
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fixed maturities, at fair value using the fair value option	0	7
CDOs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fixed maturities, at fair value using the fair value option	0	3
CMBS
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fixed maturities, at fair value using the fair value option	0	8
Corporate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Changes in fair value of assets using fair value option	(1)	0	(4)
Fixed maturities, at fair value using the fair value option	0	40
Foreign government
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Changes in fair value of assets using fair value option	0	(1)	0
U.S. government
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fixed maturities, at fair value using the fair value option	0	7
RMBS
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Changes in fair value of assets using fair value option	0	5	0
Fixed maturities, at fair value using the fair value option	41	146
Equity securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Changes in fair value of assets using fair value option	1	0	0
Total fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Changes in fair value of assets using fair value option	$ (1)	$ 4	$ (4)

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- Definition

Fair Value, Option, Fixed Maturity Securities

+ References

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- Definition

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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=75031198&loc=d3e14172-108612

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