Investments and Derivative Instruments Level 4 Net Realized Capital Gains (Losses) (Details) - Related Party [Domain] - Derivative, Name [Domain] - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis		$ 167				$ 167		$ 525
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		81				81		142
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		1,676				1,676		2,364
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		21				21		10
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax		10				10		19
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		213				213		208
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		132				132		66
Net Realized Capital Gains (Losses) Table [Abstract]
Gain on Derivative Instruments, Pretax	[1]	65		$ 54		184	$ 162
Loss on Derivative Instruments, Pretax		53		91		148	195
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net		(2)		(3)		(8)	(10)
Periodic Net Coupon Settlements on Credit Derivatives		2		4		3	9
Gain (Loss) on Reinsurance Recoverables		0		528		0	579
Gain (Loss) on Coinsurance and Modified Coinsurance Reinsurance Contracts		37		524		26	394
Realized Investment Gains (Losses)		13		650		4	544
Gain (Loss) on Investments, Excluding Other than Temporary Impairments		15		653		12	554
Derivative, Gain (Loss) on Derivative, Net		(13)		959		(40)	888
Proceeds from Sale of Available-for-sale Securities		2,500		2,200		5,600
JAPAN
Net Realized Capital Gains (Losses) Table [Abstract]
Foreign Currency Transaction Gain (Loss), before Tax				(1)			2
Derivative, Gain (Loss) on Derivative, Net	[2]	0		(103)		0	(126)
UNITED STATES
Net Realized Capital Gains (Losses) Table [Abstract]
Derivative, Gain (Loss) on Derivative, Net		(27)		(21)		(30)	(16)
Fixed Annuity Hedging Instruments [Member] | JAPAN
Net Realized Capital Gains (Losses) Table [Abstract]
Change in Unrealized Gain (Loss) on Hedged Item in Foreign Currency Fair Value Hedge				(22)			(51)
Derivative, Gain (Loss) on Derivative, Net		0	[3]	10	[3]	0	22
Three Win Related Foreign Currency Swaps [Member] | JAPAN
Net Realized Capital Gains (Losses) Table [Abstract]
Change in Unrealized Gain (Loss) on Hedged Item in Foreign Currency Fair Value Hedge		16		(18)		16	(46)
Derivative, Gain (Loss) on Derivative, Net		0		(5)		0	(14)
Change in value of derivatives and Japan FVO securities [Member]
Net Realized Capital Gains (Losses) Table [Abstract]
Foreign Currency Transaction Gain (Loss), before Tax				17			37
Mortgages [Member]
Net Realized Capital Gains (Losses) Table [Abstract]
Valuation Allowances and Reserves, Adjustments		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				(44)		34	(41)
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		16		(44)		34	(41)
Municipal Bonds [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		1				1		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		10				10		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		9				9		0
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		27				27		29
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		19				19		20
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		28				28		30
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		1				1		1
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		28				28		58
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		1,185				1,185		1,685
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		124				124		109
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		96				96		51
Debt Securities [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		76				76		129
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		203				203		189
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		127				127		60
Equity Securities [Member]
Net Realized Capital Gains (Losses) [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis								275
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		5				5		13
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		10				10		19
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		5				5		6
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		4
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		19				19		35
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		5				5		9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		4				4		5
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		74				74		118
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		8				8		11
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		52				52		64
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		10				10		12
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		2				2		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		1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		158				158		261
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		3				3		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		3				3		0
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]	6				6		19
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		90				90		84
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[4]	8				8		20
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[4]	2				2		1
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		5				5		6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		79				79		97
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		15				15		7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		10				10		$ 1
Macro Hedge Program [Member] | UNITED STATES
Net Realized Capital Gains (Losses) Table [Abstract]
Derivative, Gain (Loss) on Derivative, Net						(27)	(25)
Variable Annuity [Member]
Net Realized Capital Gains (Losses) Table [Abstract]
Derivative, Gain (Loss) on Derivative, Net		(27)		(124)		(30)	(142)
Other Investments [Member]
Net Realized Capital Gains (Losses) Table [Abstract]
Realized Investment Gains (Losses)		$ (9)		$ (233)		(19)	(235)
Mortgages [Member]
Net Realized Capital Gains (Losses) Table [Abstract]
Valuation Allowances and Reserves, Adjustments						$ 4	$ 4

[1] Includes gains (losses) of $(22) and $(51), respectively, for the three and six months ended June 30, 2014 on transactional foreign currency re-valuation related to the Japan fixed annuity product. Also includes gains (losses) of $17 and $37, respectively, for the three and six months ended June 30, 2014, due to change in value related to the derivative hedging instruments and the Japan government FVO securities.

[2] Other, net gains and losses include transactional foreign currency revaluation gains (losses) on yen denominated fixed payout annuity liabilities and gains (losses) on non-qualifying derivatives used to hedge the foreign currency exposure of the liabilities. Gains (losses) from transactional foreign currency revaluation of the reinsured liabilities were $16 and $(18), respectively, for the three months ended June 30, 2015 and 2014, and $16 and $(46), respectively, for the six months ended June 30, 2015 and 2014. Gains (losses) on instruments used to hedge the foreign currency exposure on the reinsured fixed payout annuities were $(17) and $13, respectively, for the three months ended June 30, 2015 and 2014, and $(31) and $28, respectively for the six months ended June 30, 2015 and 2014.

[3] The associated liability is adjusted for changes in foreign exchange spot rates through realized capital gains and was $(22) and $(51) for the three and six months ended June 30, 2014, respectively.

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