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Investments and Derivative Instruments Level 4 Available-for-Sale Securities (Details) - Fair Value Hierarchy [Domain]
$ in Millions
 3 Months Ended
Jun. 30, 2015
USD ($)
securities
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Schedule of Available-for-sale Securities [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ (27) $ (21)  
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 56,339   $ 55,362
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 3,198   4,377
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 406   358
Available-for-sale Equity Securities, Amortized Cost Basis [1]     676
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax [1] 56   50
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax [1] 25   27
Available-for-sale Securities, Equity Securities 856   1,047
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 3,254   4,427
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 431   385
Available-for-sale Securities, Amortized Cost Basis 57,164   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 1,946   2,141
Over one year through five years, amortized cost 11,455   11,264
Over five years through ten years, amortized cost 8,839   8,802
Over ten years, amortized cost 19,654   19,859
Mortgage-backed and asset-backed securities, amortized cost 14,445   13,296
Total fixed maturities, AFS, amortized cost 56,339   55,362
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
One year or less, fair value 1,971   2,168
Over one year through five years, fair value 11,931   11,827
Over five years through ten years, fair value 9,119   9,226
Over ten years, fair value 21,366   22,517
Mortgage-backed and asset-backed securities, fair value 14,741   13,646
Total fixed maturities, AFS, fair value 59,128   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 12,853   6,318
Less Than 12 Months, Fair Value 12,558   6,174
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 295   144
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 2,980   4,667
12 Months or More, Fair Value 2,841   4,429
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 136   241
Amortized Cost 15,833   10,985
Fair Value 15,399   10,603
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 431   385
Number of Securities Included in AFS Securities in Unrealized Loss Position | securities 3,957    
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost 93.00%    
Asset-backed Securities [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis $ 2,891   2,470
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 30   39
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 31   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 2,891   2,470
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 2,890   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 836   897
Less Than 12 Months, Fair Value 834   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 396   473
12 Months or More, Fair Value 367   440
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 29   33
Amortized Cost 1,232   1,370
Fair Value 1,201   1,333
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 31   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] 3,130   2,776
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax [3] 106   98
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax [3] 15   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] 3,130   2,776
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value [3] 3,218   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] 928   748
Less Than 12 Months, Fair Value [4] 925   743
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss [4] 3   5
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost [4] 1,232   1,489
12 Months or More, Fair Value [4] 1,217   1,461
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss [4] 12   31
Amortized Cost [4] 2,160   2,237
Fair Value [4] 2,142   2,204
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [4] 15   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 4,533   4,235
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 159   196
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 28   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 4,533   4,235
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 4,664   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 930   230
Less Than 12 Months, Fair Value 912   227
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 18   3
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 194   319
12 Months or More, Fair Value 184   306
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 10   13
Amortized Cost 1,124   549
Fair Value 1,096   533
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 28   16
Corporate Debt Securities [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 25,167   25,188
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,677   2,382
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 234   211
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities [2] 6   3
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, amortized cost 25,167   25,188
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 26,610   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 6,266   3,082
Less Than 12 Months, Fair Value 6,084   2,980
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 182   102
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 575   1,177
12 Months or More, Fair Value 523   1,068
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 52   109
Amortized Cost 6,841   4,259
Fair Value 6,607   4,048
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 234   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 1,291   1,592
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 46   73
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 24   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 1,291   1,592
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 1,313   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 460   363
Less Than 12 Months, Fair Value 445   349
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 15   14
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 109   227
12 Months or More, Fair Value 100   212
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 9   15
Amortized Cost 569   590
Fair Value 545   561
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 24   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 1,159   74
Less Than 12 Months, Fair Value 1,128   73
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 31   1
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 35   86
12 Months or More, Fair Value 32   82
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 3   4
Amortized Cost 1,194   160
Fair Value 1,160   155
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 34   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 11,445   11,735
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 887   1,141
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 34   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 11,445   11,735
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 12,298   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 3,891   3,815
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 98   122
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 20   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 3,891   3,815
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 3,969   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 1,064   320
Less Than 12 Months, Fair Value 1,057   318
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 7   2
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 310   433
12 Months or More, Fair Value 297   416
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 13   17
Amortized Cost 1,374   753
Fair Value 1,354   734
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 20   19
US Treasury Securities [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 3,991   3,551
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 195   326
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 20   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 3,991   3,551
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 4,166   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 846   432
Less Than 12 Months, Fair Value 827   431
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 62   361
12 Months or More, Fair Value 61   357
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1   4
Amortized Cost 908   793
Fair Value 888   788
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 20   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] 12   11
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost 12,489   6,146
Less Than 12 Months, Fair Value 12,212   6,014
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 277   132
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 2,913   4,565
12 Months or More, Fair Value 2,781   4,342
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 129   226
Amortized Cost 15,402   10,711
Fair Value 14,993   10,356
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 406   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] 825    
Available-for-sale Securities, Equity Securities [1] 856   699
Available-for-sale Securities 59,984    
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities [2] 12   11
Equity Securities [Member]      
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Available-for-sale Equity Securities, Amortized Cost Basis 825   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] 364   172
Less Than 12 Months, Fair Value [5] 346   160
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss [5] 18   12
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost [5] 67   102
12 Months or More, Fair Value [5] 60   87
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss [5] 7   15
Amortized Cost [5] 431   274
Fair Value [5] 406   247
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [5] 25   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 41,894   42,066
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, amortized cost 41,894   42,066
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Total fixed maturities, AFS, fair value 44,387   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     $ 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 June 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 June 30, 2015 and December 31, 2014.
[3] Gross unrealized gains (losses) exclude the fair value of bifurcated, embedded derivative features of 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 derivative features of certain securities, for which changes in fair value are recorded in net realized capital gains (losses).
[5] As of June 30, 2015 and December 31, 2014, excludes equity securities, FVO which are included in equity securities, AFS on the Condensed Consolidated Balance Sheets.