Investments and Derivative Instruments Level 4 Available-for-Sale Securities (Details) $ in Millions		3 Months Ended
		Sep. 30, 2015 USD ($) securities	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Derivative, Gain (Loss) on Derivative, Net		$ 19	$ 18
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		56,275		$ 55,362
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		3,302		4,377
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		465		358
Available-for-sale Equity Securities, Amortized Cost Basis	[1]			676
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	34		50
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	47		27
Available-for-sale Securities, Equity Securities		813		1,047
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		3,336		4,427
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		512		385
Available-for-sale Securities, Amortized Cost Basis		57,101		56,038
Available-for-sale Securities				60,083
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
One year or less, amortized cost		2,395		2,141
Over one year through five years, amortized cost		10,997		11,264
Over five years through ten years, amortized cost		9,190		8,802
Over ten years, amortized cost		19,835		19,859
Mortgage-backed and asset-backed securities, amortized cost		13,858		13,296
Total fixed maturities, AFS, amortized cost		56,275		55,362
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
One year or less, fair value		2,413		2,168
Over one year through five years, fair value		11,427		11,827
Over five years through ten years, fair value		9,438		9,226
Over ten years, fair value		21,683		22,517
Mortgage-backed and asset-backed securities, fair value		14,148		13,646
Total fixed maturities, AFS, fair value		59,109		59,384
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		12,515		6,318
Less Than 12 Months, Fair Value		12,161		6,174
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		354		144
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		2,960		4,667
12 Months or More, Fair Value		2,799		4,429
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		158		241
Amortized Cost		15,475		10,985
Fair Value		14,960		10,603
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ 512		385
Number of Securities Included in AFS Securities in Unrealized Loss Position | securities		4,208
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost		88.00%
Asset-backed Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		$ 2,715		2,470
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		37		39
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		36		37
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[2]	0		1
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, amortized cost		2,715		2,470
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, fair value		2,716		2,472
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		791		897
Less Than 12 Months, Fair Value		789		893
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		2		4
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		358		473
12 Months or More, Fair Value		324		440
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		34		33
Amortized Cost		1,149		1,370
Fair Value		1,113		1,333
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		36		37
Collateralized Debt Obligations [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	[3]	2,962		2,776
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	[3]	89		98
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	[3]	17		36
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[2],[3]	0		0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, amortized cost	[3]	2,962		2,776
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, fair value	[3]	3,031		2,841
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	[4]	1,047		748
Less Than 12 Months, Fair Value	[4]	1,041		743
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[4]	6		5
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	[4]	1,104		1,489
12 Months or More, Fair Value	[4]	1,090		1,461
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[4]	11		31
Amortized Cost	[4]	2,151		2,237
Fair Value	[4]	2,131		2,204
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[4]	17		36
Commercial Mortgage Backed Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		4,404		4,235
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		163		196
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		25		16
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[2]	6		6
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, amortized cost		4,404		4,235
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, fair value		4,542		4,415
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		745		230
Less Than 12 Months, Fair Value		730		227
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		15		3
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		189		319
12 Months or More, Fair Value		179		306
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		10		13
Amortized Cost		934		549
Fair Value		909		533
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		25		16
Corporate Debt Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		25,427		25,188
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		1,636		2,382
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		291		211
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[2]	1		3
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, amortized cost		25,427		25,188
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, fair value		26,772		27,359
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		6,528		3,082
Less Than 12 Months, Fair Value		6,298		2,980
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		230		102
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		660		1,177
12 Months or More, Fair Value		599		1,068
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		61		109
Amortized Cost		7,188		4,259
Fair Value		6,897		4,048
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		291		211
Foreign Government Debt Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		1,258		1,592
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		43		73
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		46		29
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[2]	0		0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, amortized cost		1,258		1,592
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, fair value		1,255		1,636
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		517		363
Less Than 12 Months, Fair Value		485		349
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		32		14
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		127		227
12 Months or More, Fair Value		113		212
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		14		15
Amortized Cost		644		590
Fair Value		598		561
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		46		29
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		841		74
Less Than 12 Months, Fair Value		821		73
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		20		1
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		38		86
12 Months or More, Fair Value		35		82
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		3		4
Amortized Cost		879		160
Fair Value		856		155
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		23		5
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		11,275		11,735
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		959		1,141
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		23		5
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[2]	0		0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, amortized cost		11,275		11,735
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, fair value		12,211		12,871
Residential Mortgage Backed Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		3,777		3,815
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		101		122
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		19		19
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[2]	0		1
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, amortized cost		3,777		3,815
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, fair value		3,859		3,918
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		835		320
Less Than 12 Months, Fair Value		830		318
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		5		2
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		402		433
12 Months or More, Fair Value		388		416
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		14		17
Amortized Cost		1,237		753
Fair Value		1,218		734
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		19		19
US Treasury Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		4,457		3,551
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		274		326
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		8		5
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[2]	0		0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, amortized cost		4,457		3,551
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, fair value		4,723		3,872
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		766		432
Less Than 12 Months, Fair Value		758		431
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		8		1
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		8		361
12 Months or More, Fair Value		8		357
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0		4
Amortized Cost		774		793
Fair Value		766		788
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		8		5
Debt Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[2]	7		11
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost		12,070		6,146
Less Than 12 Months, Fair Value		11,752		6,014
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		318		132
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost		2,886		4,565
12 Months or More, Fair Value		2,736		4,342
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		147		226
Amortized Cost		14,956		10,711
Fair Value		14,488		10,356
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		465		358
Available-for-sale Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Equity Securities, Amortized Cost Basis	[1]	826
Available-for-sale Securities, Equity Securities	[1]	813		699
Available-for-sale Securities		59,922
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[2]	7		11
Equity Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Equity Securities, Amortized Cost Basis		826		1,027
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	[1],[2]	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	[5]	445		172
Less Than 12 Months, Fair Value	[5]	409		160
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[5]	36		12
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	[5]	74		102
12 Months or More, Fair Value	[5]	63		87
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[5]	11		15
Amortized Cost	[5]	519		274
Fair Value	[5]	472		247
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[5]	47		27
Fixed maturities available-for-sale, excluding mortgage-backed and asset-backed securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		42,417		42,066
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, amortized cost		42,417		42,066
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total fixed maturities, AFS, fair value		44,961		45,738
Equity Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Equity Securities, Amortized Cost Basis		0		351
Available-for-sale Securities, Equity Securities		$ 0		$ 348

[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.

[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 September 30, 2015, and December 31, 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] As of September 30, 2015, and December 31, 2014, excludes equity securities, FVO which are included in equity securities, AFS on the Condensed Consolidated Balance Sheets.