Investments and Derivative Instruments Level 4 Available-for-Sale Securities (Details) $ in Millions		Jun. 30, 2016 USD ($) Security		Dec. 31, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		$ 143		$ 331
Available-for-sale Equity Securities, Amortized Cost Basis		123		471
Available-for-sale Securities, Equity Securities		136		459
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		149		342
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		2,469		1,442
Available-for-sale Securities, Amortized Cost
One year or less, amortized cost		846		953
Over one year through five years, amortized cost		4,621		4,973
Over five years through ten years, amortized cost		3,870		3,650
Over ten years, amortized cost		8,045		8,361
Available-for-sale Securities, Fair Value
One year or less, fair value		853		974
Over one year through five years, fair value		4,816		5,075
Over five years through ten years, fair value		4,096		3,714
Over ten years, fair value		9,769		9,173
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis		23,392		23,559
Available-for-sale Securities, Debt Securities		25,700		24,657
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis		6,010		5,622
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value		6,166		5,721
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Amortized Cost Basis		23,515		23,737
Available-for-sale Securities				24,835
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		1,900		8,179
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		1,857		7,937
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		1,958		1,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		1,853		1,443
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		3,858		9,724
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		3,710		9,380
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		$ 2,450		1,431
Number of Securities Included in AFS Securities in Unrealized Loss Position | Security		1,625
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost		90.00%
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	$ 19		11
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	6		11
Fixed maturities available-for-sale, excluding mortgage-backed and asset-backed securities [Member]
Available-for-sale Securities, Fair Value
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis		17,382		17,937
Available-for-sale Securities, Debt Securities		19,534		18,936
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		34		34
Available-for-sale Securities, Fair Value
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis		1,035		864
Available-for-sale Securities, Debt Securities		1,019		846
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		172		387
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		171		385
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		309		271
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		276		239
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		481		658
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		447		624
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		18		16
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		0	[2]	0
Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	[3]	11		11
Available-for-sale Securities, Fair Value
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	[3]	1,223		1,354
Available-for-sale Securities, Debt Securities	[3]	1,269		1,408
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	[4]	431		608
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[4]	429		602
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	[4]	569		500
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[4]	561		493
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	[4]	1,000		1,108
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	[4]	990		1,095
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	[3]	56		67
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[3]	0	[2]	0
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		11		24
Available-for-sale Securities, Fair Value
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis		2,066		1,936
Available-for-sale Securities, Debt Securities		2,146		1,964
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		183		655
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		179		636
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		189		99
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		182		94
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		372		754
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		361		730
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		91		52
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		2	[2]	3
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		76		225
Available-for-sale Securities, Fair Value
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis		14,051		14,425
Available-for-sale Securities, Debt Securities		15,594		15,175
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		862		4,880
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		831		4,696
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		577		363
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		532		322
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		1,439		5,243
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		1,363		5,018
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		1,619		975
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		9	[2]	3
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		3		11
Available-for-sale Securities, Fair Value
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis		272		328
Available-for-sale Securities, Debt Securities		296		331
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		33		144
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		31		136
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		35		30
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		34		27
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		68		174
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		65		163
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		27		14
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		0	[2]	0
Municipal Bonds [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		2		179
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		2		174
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		6		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		6		0
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		8		179
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		8		174
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		0		5
Available-for-sale Securities, Fair Value
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis		1,090		1,057
Available-for-sale Securities, Debt Securities		1,282		1,132
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		192		80
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		0	[2]	0
Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		8		8
Available-for-sale Securities, Fair Value
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis		1,686		1,468
Available-for-sale Securities, Debt Securities		1,732		1,503
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		187		280
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		186		279
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		235		230
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		228		223
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		422		510
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		414		502
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		54		43
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		0	[2]	0
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		0		13
Available-for-sale Securities, Fair Value
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis		1,969		2,127
Available-for-sale Securities, Debt Securities		2,362		2,298
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		0		963
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		0		950
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		0		8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0		8
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		0		971
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		0		958
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		393		184
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		0	[2]	0
Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		1,870		8,096
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		1,829		7,858
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		1,920		1,501
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		1,819		1,406
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		3,790		9,597
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		3,648		9,264
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		11	[2]	6
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	[1]	123
Available-for-sale Securities, Equity Securities	[1]	136		178
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities		25,836
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		11	[2]	6
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	[1]			178
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	[5]	30		83
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[5]	28		79
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	[5]	38		44
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[5]	34		37
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	[5]	68		127
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	[5]	62		116
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[1]	0	[2]	0
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis		0		293
Available-for-sale Securities, Equity Securities		$ 0		$ 281

[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] Represents the amount of cumulative non-credit OTTI losses recognized in OCI on securities that also had credit impairments. These losses are included in gross unrealized losses as of June 30, 2016 and December 31, 2015

[3] 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).

[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] 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.