Investments and Derivative Instruments Level 4 Available-for-Sale Securities (Details) $ in Millions		12 Months Ended
		Dec. 31, 2015 USD ($) Security		Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis		$ 471		$ 525
Available-for-sale Securities, Amortized Cost Basis		23,737		23,535
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		1,442		2,374
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	11		10
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		342		208
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	11		19
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		1,431		2,364
Available-for-sale Securities				25,702
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		331		189
Investments Classified by Contractual Maturity Date [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis		953		1,031
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value		974		1,043
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis		4,973		4,902
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value		5,075		5,168
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis		3,650		3,345
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value		3,714		3,501
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis		8,361		8,116
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value		9,173		9,661
Available-for-sale Debt Securities, Amortized Cost Basis		23,559		23,260
Available-for-sale Securities, Debt Securities		24,657		25,436
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		8,179		2,714
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		7,937		2,648
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		242		66
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		1,545		2,386
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		1,443		2,245
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		100		142
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		9,724		5,100
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		9,380		4,893
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		$ 342		208
Number of Securities Included in AFS Securities in Unrealized Loss Position | Security		2,814
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost		92.00%
Equity securities, AFS		$ 459		514
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis		5,622		5,866
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value		5,721		6,063
Fixed maturities available-for-sale, excluding mortgage-backed and asset-backed securities [Member]
Investments Classified by Contractual Maturity Date [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		17,937		17,394
Available-for-sale Securities, Debt Securities		18,936		19,373
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		16		20
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		34		30
Investments Classified by Contractual Maturity Date [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		864		1,181
Available-for-sale Securities, Debt Securities		846		1,171
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		0	[2]	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		387		368
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		385		367
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		2		1
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		271		340
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		239		311
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		32		29
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		658		708
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		624		678
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		34		30
Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	[3]	67		84
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	[3]	11		20
Investments Classified by Contractual Maturity Date [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	[3]	1,354		1,083
Available-for-sale Securities, Debt Securities	[3]	1,408		1,148
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[3]	0	[2]	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	[4]	608		123
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[4]	602		122
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[4]	6		1
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	[4]	500		771
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[4]	493		753
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	[4]	5		19
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	[4]	1,108		894
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	[4]	1,095		875
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	[4]	11		20
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		52		97
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		24		7
Investments Classified by Contractual Maturity Date [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		1,936		1,797
Available-for-sale Securities, Debt Securities		1,964		1,887
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		3	[2]	3
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		655		109
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		636		108
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		19		1
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		99		194
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		94		188
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		5		6
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		754		303
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		730		296
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		24		7
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		975		1,685
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		225		109
Investments Classified by Contractual Maturity Date [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		14,425		14,166
Available-for-sale Securities, Debt Securities		15,175		15,742
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		3	[2]	3
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		4,880		1,542
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		4,696		1,491
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		184		51
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		363		661
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		322		603
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		41		58
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		5,243		2,203
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		5,018		2,094
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		225		109
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		14		35
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		11		9
Investments Classified by Contractual Maturity Date [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		328		576
Available-for-sale Securities, Debt Securities		331		602
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		0	[2]	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		144		145
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		136		140
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		8		5
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		30		68
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		27		64
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		3		4
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		174		213
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		163		204
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		11		9
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		179		14
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		174		14
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		5		0
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		0		13
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0		12
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		0		1
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		179		27
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		174		26
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		5		1
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		80		118
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		5		1
Investments Classified by Contractual Maturity Date [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		1,057		935
Available-for-sale Securities, Debt Securities		1,132		1,052
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 Gain, before Tax		43		64
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		8		12
Investments Classified by Contractual Maturity Date [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		1,468		1,805
Available-for-sale Securities, Debt Securities		1,503		1,857
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		0	[2]	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		280		148
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		279		147
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		1		1
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		230		229
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		223		218
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		7		11
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		510		377
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		502		365
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		8		12
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		184		261
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		13		1
Investments Classified by Contractual Maturity Date [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		2,127		1,717
Available-for-sale Securities, Debt Securities		2,298		1,977
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		0	[2]	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		963		184
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		950		184
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		13		0
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		8		18
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		8		17
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		0		1
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		971		202
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		958		201
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		13		1
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds		9,454		9,084	$ 19,190
Investments Classified by Contractual Maturity Date [Abstract]
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		6	[2]	6
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		8,096		2,633
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		7,858		2,573
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		238		60
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		1,501		2,294
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		1,406		2,166
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		93		129
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost		9,597		4,927
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		9,264		4,739
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		331		189
Available-for-sale Securities, Gross Realized Gains	[5]	195		210	1,867
Available-for-sale Securities, Gross Realized Losses		(161)		(183)	(421)
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	[1]	178
Available-for-sale Securities		24,835
Investments Classified by Contractual Maturity Date [Abstract]
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities		6	[2]	6
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Equity securities, AFS	[1]	178		266
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds		586		107	81
Available-for-sale Equity Securities, Amortized Cost Basis	[1]			275
Investments Classified by Contractual Maturity Date [Abstract]
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[1]	0	[2]	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	[6]	83		81
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[6]	79		75
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[6]	4		6
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	[6]	44		92
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[6]	37		79
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	[6]	7		13
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	[6]	127		173
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	[6]	116		154
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	[6]	11		19
Available-for-sale Securities, Gross Realized Gains		26		9	254
Available-for-sale Securities, Gross Realized Losses		(26)		(6)	$ (263)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis		293		250
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Equity securities, AFS		$ 281		$ 248

[1] [3]Excludes equity securities, FVO, with a cost and fair value of $293 and $281, respectively, as of December 31, 2015, and $250 and $248 as of December 31, 2014.

[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 December 31, 2015 and 2014.

[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] Includes $1.5 billion of gross gains relating to the sales of the Retirement Plans and Individual Life businesses for the year ended December 31, 2013.

[6] [2]As of December 31, 2015 and 2014, excludes equity securities, FVO which are included in equity securities, AFS on the Consolidated Balance Sheets.