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Investments and Derivative Instruments Level 4 Available-for-Sale Securities (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2016
USD ($)
securities
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 3,531    
Derivative, Gain (Loss) on Derivative, Net $ (31) $ (3)  
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 57,378   $ 56,965
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 3,757   2,892
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 443   658
Available-for-sale Equity Securities, Amortized Cost Basis 767   1,135
Available-for-sale Securities, Equity Securities 798   1,121
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 3,813   2,930
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 468   699
Available-for-sale Securities, Amortized Cost Basis 58,145   57,807
Available-for-sale Securities     60,035
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]      
One year or less, amortized cost 2,509   2,373
Over one year through five years, amortized cost 10,591   10,929
Over five years through ten years, amortized cost 8,816   9,322
Over ten years, amortized cost 20,309   20,178
Mortgage-backed and asset-backed securities, amortized cost 15,153   14,163
Total fixed maturities, AFS, amortized cost 57,378   56,965
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
One year or less, fair value 2,527   2,405
Over one year through five years, fair value 10,986   11,200
Over five years through ten years, fair value 9,242   9,497
Over ten years, fair value 22,604   21,794
Mortgage-backed and asset-backed securities, fair value 15,334   14,300
Total fixed maturities, AFS, fair value 60,693   59,196
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less Than 12 Months, Fair Value 9,508   18,569
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 269   526
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 3,551   3,072
12 Months or More, Fair Value 3,352   2,896
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 199   173
Amortized Cost 13,327   22,167
Fair Value 12,860   21,465
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 468   699
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost 9,776   19,095
Gain (Loss) on Investments, Excluding Other than Temporary Impairments $ (132) 17  
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost 92.00%    
Assets, Fair Value Disclosure $ 180,515   181,633
Asset-backed Securities [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 2,683   2,520
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 29   24
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 47   45
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities [1] 0   0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, amortized cost 2,683   2,520
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 2,665   2,499
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less Than 12 Months, Fair Value 1,112   1,609
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 9   10
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 368   357
12 Months or More, Fair Value 330   322
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 38   35
Amortized Cost 1,489   1,976
Fair Value 1,442   1,931
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 47   45
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost 1,121   1,619
Collateralized Debt Obligations [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis [2] 3,075   2,989
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax [2] 68   75
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax [2] 37   23
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, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, amortized cost [2] 3,075   2,989
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value [2] 3,107   3,038
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less Than 12 Months, Fair Value [3] 1,523   1,154
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss [3] 21   10
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost [3] 1,108   1,243
12 Months or More, Fair Value [3] 1,092   1,227
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss [3] 16   13
Amortized Cost [3] 2,651   2,407
Fair Value [3] 2,615   2,381
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [3] 37   23
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost [3] 1,543   1,164
Commercial Mortgage Backed Securities [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 5,132   4,668
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 155   105
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 63   56
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities [1] 8   8
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, amortized cost 5,132   4,668
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 5,224   4,717
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less Than 12 Months, Fair Value 1,322   1,681
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 48   45
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 250   189
12 Months or More, Fair Value 235   178
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 15   11
Amortized Cost 1,620   1,915
Fair Value 1,557   1,859
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 63   56
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost 1,370   1,726
Corporate Debt Securities [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 25,723   25,876
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,818   1,342
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 244   416
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities [1] 17   3
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, amortized cost 25,723   25,876
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 27,297   26,802
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less Than 12 Months, Fair Value 3,662   8,866
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 148   340
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 890   656
12 Months or More, Fair Value 794   580
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 96   76
Amortized Cost 4,700   9,862
Fair Value 4,456   9,446
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 244   416
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost 3,810   9,206
Foreign Government Debt Securities [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 1,146   1,321
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 57   34
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 14   47
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities [1] 0   0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, amortized cost 1,146   1,321
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 1,189   1,308
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less Than 12 Months, Fair Value 210   646
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 7   33
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 78   124
12 Months or More, Fair Value 71   110
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 7   14
Amortized Cost 295   803
Fair Value 281   756
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 14   47
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost 217   679
Municipal Bonds [Member]      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less Than 12 Months, Fair Value 267   430
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 5   10
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 33   18
12 Months or More, Fair Value 31   17
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2   1
Amortized Cost 305   458
Fair Value 298   447
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 7   11
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost 272   440
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 11,186   11,124
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,124   1,008
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 7   11
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities [1] 0   0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, amortized cost 11,186   11,124
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 12,303   12,121
Residential Mortgage Backed Securities [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 4,263   3,986
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 103   82
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 28   22
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities [1] 0   0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, amortized cost 4,263   3,986
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 4,338   4,046
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less Than 12 Months, Fair Value 909   1,340
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 10   9
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 743   415
12 Months or More, Fair Value 725   402
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 18   13
Amortized Cost 1,662   1,764
Fair Value 1,634   1,742
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 28   22
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost 919   1,349
US Treasury Securities [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 4,170   4,481
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 403   222
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 3   38
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities [1] 0   0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, amortized cost 4,170   4,481
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 4,570   4,665
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less Than 12 Months, Fair Value 246   2,394
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2   38
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 25   8
12 Months or More, Fair Value 24   8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1   0
Amortized Cost 273   2,440
Fair Value 270   2,402
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 3   38
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost 248   2,432
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 [1] 25   11
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less Than 12 Months, Fair Value 9,251   18,120
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 250   495
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 3,495   3,010
12 Months or More, Fair Value 3,302   2,844
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 193   163
Amortized Cost 12,995   21,625
Fair Value 12,553   20,964
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 443   658
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost 9,500   18,615
Available-for-sale Securities [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Securities 61,491    
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities [1] 25   11
Equity Securities [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Equity Securities, Amortized Cost Basis 767 [4]   842
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax [4] 56   38
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax [4] 25   41
Available-for-sale Securities, Equity Securities [4] 798   839
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities [1],[4] 0   0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less Than 12 Months, Fair Value [5] 257   449
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss [5] 19   31
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost [5] 56   62
12 Months or More, Fair Value [5] 50   52
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss [5] 6   10
Amortized Cost [5] 332   542
Fair Value [5] 307   501
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [5] 25   41
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost [5] 276   480
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 42,225   42,802
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, amortized cost 42,225   42,802
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 45,359   44,896
Equity Securities [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Equity Securities, Amortized Cost Basis     293
Available-for-sale Securities, Equity Securities 0   282
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Gain (Loss) on Investments, Excluding Other than Temporary Impairments 41 $ 37  
Equity Securities [Member]      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Assets, Fair Value Disclosure $ 0   $ 282
[1] 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 March 31, 2016, and December 31, 2015.
[2] 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).
[3] 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).
[4] Excluded equity securities, FVO, with a cost and fair value of $293 and $282 as of December 31, 2015. The Company held no equity securities, FVO as of March 31, 2016.
[5] As of March 31, 2016, and December 31, 2015, excludes equity securities, FVO which are included in equity securities, AFS on the Condensed Consolidated Balance Sheets.