Investments and Derivative Instruments Level 4 Net Realized Capital Gains (Losses) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Net Realized Capital Gains (Losses) [Line Items]
Foreign Currency Transaction Gain (Loss), Realized		$ (64)		$ 16
Available-for-sale Securities, Gross Realized Gains		61		65		$ 91	$ 184
Available-for-sale Equity Securities, Amortized Cost Basis		123				123		$ 471
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		105				105		100
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		2,450				2,450		1,431
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	19				19		11
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	6				6		11
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		149				149		342
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		44				44		242
Net Realized Capital Gains (Losses) Table [Abstract]
Available-for-sale Securities, Gross Realized Losses		13		53		60	148
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net		(1)		(2)		(11)	(8)
Periodic Net Coupon Settlements on Credit Derivatives		(1)		2		0	3
Derivative, Gain (Loss) on Derivative, Net		22	[2]	(13)	[2]	19	(40)
Gain (Loss) on Coinsurance and Modified Coinsurance Reinsurance Contracts		(25)		37		(47)	26
Realized Investment Gains (Losses)		3		13		(114)	4
Gain (Loss) on Investments, Excluding Other than Temporary Impairments		4		15		(103)	12
Proceeds from Sale of Available-for-sale Securities		1,700		2,500		3,900	5,600
Three Win Related Foreign Currency Swaps [Member] | JAPAN
Net Realized Capital Gains (Losses) [Line Items]
Foreign Currency Transaction Gain (Loss), Realized						(108)	16
Mortgages [Member]
Net Realized Capital Gains (Losses) Table [Abstract]
Valuation Allowances and Reserves, Adjustments		0		0		0	(4)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Net Realized Capital Gains (Losses) Table [Abstract]
Gain (Loss) on Investments, Excluding Other than Temporary Impairments				16		21	34
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Net Realized Capital Gains (Losses) Table [Abstract]
Gain (Loss) on Investments, Excluding Other than Temporary Impairments		47		16		21	34
Municipal Bonds [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0				0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		0				0		5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0				0		5
Asset-backed Securities [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		33				33		32
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		18				18		16
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		34				34		34
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		1				1		2
Corporate Debt Securities [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		45				45		41
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		1,619				1,619		975
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		76				76		225
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		31				31		184
Debt Securities [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		101				101		93
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		143				143		331
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		42				42		238
Equity Securities [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	[1]							178
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[3]	4				4		7
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[3]	6				6		11
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[3]	2				2		4
Foreign Government Debt Securities [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		1				1		3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		27				27		14
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		3				3		11
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		2				2		8
US States and Political Subdivisions Debt Securities [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		192				192		80
Residential Mortgage Backed Securities [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		7				7		7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		54				54		43
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		8				8		8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		1				1		1
US Treasury Securities [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0				0		0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		393				393		184
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		0				0		13
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0				0		13
Collateralized Debt Obligations [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[4]	8				8		5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	[5]	56				56		67
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[4]	11				11		11
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[4]	3				3		6
Commercial Mortgage Backed Securities [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		7				7		5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		91				91		52
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		11				11		24
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		4				4		$ 19
Macro Hedge Program [Member] | UNITED STATES
Net Realized Capital Gains (Losses) Table [Abstract]
Derivative, Gain (Loss) on Derivative, Net						(34)	(27)
Variable Annuity [Member]
Net Realized Capital Gains (Losses) Table [Abstract]
Derivative, Gain (Loss) on Derivative, Net		(17)		(27)		(48)	(30)
Other Investments [Member]
Net Realized Capital Gains (Losses) Table [Abstract]
Realized Investment Gains (Losses)	[6]	(1)		(9)		(39)	$ (19)
Not Designated as Hedging Instrument [Member]
Net Realized Capital Gains (Losses) Table [Abstract]
Derivative, Gain (Loss) on Derivative, Net						$ (8)
Not Designated as Hedging Instrument [Member] | JAPAN
Net Realized Capital Gains (Losses) Table [Abstract]
Derivative, Gain (Loss) on Derivative, Net		$ 60		$ (17)

[1] Excluded equity securities, FVO, with a cost and fair value of $293 and $281 as of December 31, 2015. The Company did not hold any equity securities, FVO as of June 30, 2016.

[2] Excludes investments that contain an embedded credit derivative for which the Company has elected the fair value option. For further discussion, see the Fair Value Option section in Note 2 - Fair Value Measurements.

[3] As of June 30, 2016 and December 31, 2015, excludes equity securities, FVO, which are included in equity securities, AFS on the Condensed Consolidated Balance Sheets.

[4] Unrealized losses exclude the change in fair value of bifurcated embedded derivatives within certain securities, for which changes in fair value are recorded in net realized capital gains (losses).

[5] Gross unrealized gains (losses) exclude the fair value of bifurcated embedded derivatives within certain securities. Subsequent changes in value are recorded in net realized capital gains (losses).

[6] Primarily consists of changes in value of non-qualifying derivatives and transactional foreign currency revaluation gains (losses). For the three months ended June 30, 2016 and 2015, transactional foreign currency revaluation gains (losses) were $(64) and $16, respectively, and related to yen denominated fixed payout annuity liabilities, which were largely offset by gains (losses) of $60 and $(17), respectively