Fair Value Measurements Level 4 Fair Value Option (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items]
Available-for-sale Securities, Equity Securities		$ 813		$ 813		$ 1,047
Available-for-sale Equity Securities, Amortized Cost Basis	[1]					676
Fair Value of Assets Accounted for Using Fair Value Option		182,893		182,893		199,248
Fair Value, Option, Changes in Fair Value, Gain (Loss)		(4)	$ (7)	(4)	$ 14
Corporate Debt Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		(2)	(5)	(5)	(1)
Collateralized Debt Obligations [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		1	0	2	14
Foreign Government Debt Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		(3)	(1)	(4)	1
Residential Mortgage Backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		0	(1)	0	0
Fixed Maturities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		(4)	(7)	(7)	14
Equity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Available-for-sale Securities, Equity Securities		0		0		348
Available-for-sale Equity Securities, Amortized Cost Basis		0		0		351
Fair Value, Option, Changes in Fair Value, Gain (Loss)		0	$ 0	3	$ 0
Equity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option		0		0		348
Fixed Maturities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option		548		548		488
Fixed Maturities [Member] | Asset-backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option		12		12		15
Fixed Maturities [Member] | Corporate Debt Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option		98		98		133
Fixed Maturities [Member] | Collateralized Debt Obligations [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option		50		50		69
Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option		24		24		22
Fixed Maturities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option		36		36		30
Fixed Maturities [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option		321		321		215
Fixed Maturities [Member] | US Treasury Bond Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option		5		5		2
Fixed Maturities [Member] | Municipal Bonds [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option		$ 2		$ 2		$ 2

[1] Excludes equity securities, FVO, with a cost and fair value of $351 and $348, respectively, as of December 31, 2014. The Company did not hold any equity securities, FVO as of September 30, 2015.