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Investments and Derivative Instruments Level 4 Net Realized Capital Gains (Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Net Realized Capital Gains (Losses) [Line Items]      
Foreign Currency Transaction Gain (Loss), Realized $ (50)    
Available-for-sale Securities, Gross Realized Gains [1] 90 $ 197  
Foreign Currency Transaction Gain (Loss), Unrealized   0  
Derivative, Notional Amount 61,322   $ 62,185
Derivative, Fair Value, Net (1,016)   (926)
Gain (Loss) on Investments [Abstract]      
Available-for-sale Securities, Gross Realized Losses 108 148  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 23 12  
Periodic Net Coupon Settlements on Credit Derivatives 0 1  
Derivative, Gain (Loss) on Derivative, Net (31) (3)  
Total Realized Investment Gains (Losses) (155) 5  
Gain (Loss) on Investments, Excluding Other than Temporary Impairments (132) 17  
Proceeds from Sale of Available-for-sale Securities 4,900 6,200  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost 9,776   19,095
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,352   2,896
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 199   173
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 13,327   22,167
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 12,860   21,465
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 468   699
Derivative Asset, Fair Value, Gross Asset 1,188   933
Derivative Liability, Fair Value, Gross Liability 1,975   1,730
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement 1,345   1,095
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement 2,361   2,021
GMWB Hedging Instruments [Member] | UNITED STATES      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 10,787   10,979
Derivative, Fair Value, Net 192   158
Mortgages [Member]      
Gain (Loss) on Investments [Abstract]      
Valuation Allowances and Reserves, Adjustments 0 3  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]      
Gain (Loss) on Investments [Abstract]      
Gain (Loss) on Investments, Excluding Other than Temporary Impairments 41 37  
Collateralized Debt Obligations [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] 1,543   1,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value [2] 1,523   1,154
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss [2] 21   10
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost [2] 1,108   1,243
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value [2] 1,092   1,227
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss [2] 16   13
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost [2] 2,651   2,407
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [2] 2,615   2,381
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [2] 37   23
Asset-backed 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 1,121   1,619
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 330   322
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 38   35
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 1,489   1,976
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,442   1,931
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 47   45
Commercial Mortgage Backed 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 1,370   1,726
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 235   178
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 15   11
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 1,620   1,915
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,557   1,859
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 63   56
Corporate 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 3,810   9,206
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 794   580
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 96   76
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 4,700   9,862
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 4,456   9,446
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 244   416
Foreign Government 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 217   679
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 71   110
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 7   14
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 295   803
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 281   756
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 14   47
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 272   440
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 31   17
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2   1
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 305   458
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 298   447
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 7   11
Residential Mortgage Backed 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 919   1,349
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 725   402
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 18   13
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 1,662   1,764
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,634   1,742
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 28   22
US Treasury 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 248   2,432
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 24   8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1   0
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 273   2,440
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 270   2,402
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 3   38
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 9,500   18,615
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,302   2,844
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 193   163
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 12,995   21,625
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 12,553   20,964
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 443   658
Equity 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 [3] 276   480
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value [3] 257   449
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss [3] 19   31
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost [3] 56   62
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value [3] 50   52
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss [3] 6   10
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost [3] 332   542
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [3] 307   501
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [3] 25   41
Other Investments [Member]      
Gain (Loss) on Investments [Abstract]      
Total Realized Investment Gains (Losses) [1] (83) (27)  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 3,621   3,670
Derivative, Fair Value, Net 71   (2)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 100   57
Derivative Liability, Fair Value, Gross Liability 29   59
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 3,478   3,527
Derivative, Fair Value, Net 89   17
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 94   50
Derivative Liability, Fair Value, Gross Liability 5   33
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 143   143
Derivative, Fair Value, Net (18)   (19)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 6   7
Derivative Liability, Fair Value, Gross Liability 24   26
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 23   23
Derivative, Fair Value, Net 0   0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 0   0
Derivative Liability, Fair Value, Gross Liability 0   0
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest Rate Contract [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 23   23
Derivative, Fair Value, Net 0   0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 0   0
Derivative Liability, Fair Value, Gross Liability 0   0
Not Designated as Hedging Instrument [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 57,678   58,492
Derivative, Fair Value, Net (1,087)   (924)
Gain (Loss) on Investments [Abstract]      
Derivative, Gain (Loss) on Derivative, Net [4] (29) (36)  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 1,245   1,038
Derivative Liability, Fair Value, Gross Liability 2,332   1,962
Not Designated as Hedging Instrument [Member] | GMWB Hedging Instruments [Member] | UNITED STATES      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 10,787   10,979
Derivative, Fair Value, Net 192   158
Gain (Loss) on Investments [Abstract]      
Derivative, Gain (Loss) on Derivative, Net 50 13  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 338   264
Derivative Liability, Fair Value, Gross Liability 146   106
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]      
Gain (Loss) on Investments [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (24) (12)  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]      
Gain (Loss) on Investments [Abstract]      
Derivative, Gain (Loss) on Derivative, Net 3 7  
Not Designated as Hedging Instrument [Member] | Three Win Related Foreign Currency Swaps [Member] | JAPAN      
Gain (Loss) on Investments [Abstract]      
Derivative, Gain (Loss) on Derivative, Net [5] 36 (14)  
Not Designated as Hedging Instrument [Member] | Macro Hedge Program [Member] | UNITED STATES      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 4,605   4,548
Derivative, Fair Value, Net 145   147
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 178   179
Derivative Liability, Fair Value, Gross Liability 33   32
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Not Designated as Hedging Instrument [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 905   895
Derivative, Fair Value, Net 57   79
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 57   79
Derivative Liability, Fair Value, Gross Liability 0   0
Put Option [Member] | Not Designated as Hedging Instrument [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 500   500
Derivative, Fair Value, Net 5   7
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 5   7
Derivative Liability, Fair Value, Gross Liability 0   0
GMWB Reinsurance [Member] | Not Designated as Hedging Instrument [Member] | UNITED STATES      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 3,005   3,106
Derivative, Fair Value, Net 99   83
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 99   83
Derivative Liability, Fair Value, Gross Liability 0   0
GMWB Product Derivatives [Member] | Not Designated as Hedging Instrument [Member] | UNITED STATES      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount [6] 14,597   15,099
Derivative, Fair Value, Net [6] (361)   (262)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset [6] 0   0
Derivative Liability, Fair Value, Gross Liability [6] 361   262
Equity Contract [Member] | GMWB Hedging Instruments [Member] | UNITED STATES      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 1,392   1,362
Derivative, Fair Value, Net (6)   2
Equity Contract [Member] | Not Designated as Hedging Instrument [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 1,429   419
Derivative, Fair Value, Net 5   15
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 34   41
Derivative Liability, Fair Value, Gross Liability 29   26
Credit Derivatives in Offsetting Positions [Member] | Not Designated as Hedging Instrument [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 4,034   4,059
Derivative, Fair Value, Net (2)   (2)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 43   40
Derivative Liability, Fair Value, Gross Liability 45   42
Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount [7] 1,397   2,458
Derivative, Fair Value, Net [7] (9)   (13)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset [7] 8   9
Derivative Liability, Fair Value, Gross Liability [7] 17   22
Credit Default Swap, Buying Protection [Member] | Not Designated as Hedging Instrument [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 494   423
Derivative, Fair Value, Net (11)   18
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 2   22
Derivative Liability, Fair Value, Gross Liability 13   4
Three Win Related Foreign Currency Swaps [Member] | Not Designated as Hedging Instrument [Member] | JAPAN      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 1,063   1,063
Derivative, Fair Value, Net (321)   (357)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 0   0
Derivative Liability, Fair Value, Gross Liability 321   357
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 317   653
Derivative, Fair Value, Net 6   17
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 6   17
Derivative Liability, Fair Value, Gross Liability 0   0
Interest Rate Contract [Member] | GMWB Hedging Instruments [Member] | UNITED STATES      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 3,773   3,740
Derivative, Fair Value, Net 48   25
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 14,545   14,290
Derivative, Fair Value, Net (892)   (814)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 475   297
Derivative Liability, Fair Value, Gross Liability 1,367   1,111
Macro Hedge Program [Member] | UNITED STATES      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 4,605   4,548
Derivative, Fair Value, Net 145   147
Macro Hedge Program [Member] | Not Designated as Hedging Instrument [Member] | UNITED STATES      
Gain (Loss) on Investments [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (14) $ (4)  
Other Liabilities [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 18,980   19,358
Derivative, Fair Value, Net (887)   (798)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 622   524
Derivative Liability, Fair Value, Gross Liability 1,509   1,322
Fixed Maturities [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 426   425
Derivative, Fair Value, Net 1   (3)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 1   0
Derivative Liability, Fair Value, Gross Liability 0   3
Other Investments [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 23,359   23,253
Derivative, Fair Value, Net 100   1
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 566   409
Derivative Liability, Fair Value, Gross Liability 466   408
Reinsurance Recoverable [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 3,910   4,000
Derivative, Fair Value, Net 156   162
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 156   162
Derivative Liability, Fair Value, Gross Liability 0   0
Other Policyholder Funds and Benefits Payable [Member]      
Net Realized Capital Gains (Losses) [Line Items]      
Derivative, Notional Amount 14,647   15,149
Derivative, Fair Value, Net (386)   (288)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Derivative Asset, Fair Value, Gross Asset 0   0
Derivative Liability, Fair Value, Gross Liability $ 386   $ 288
[1] Primarily consists of changes in the value of non-qualifying derivatives, transactional foreign currency revaluation gains (losses) on yen denominated fixed payout annuity liabilities and gains (losses) on non-qualifying derivatives used to hedge the foreign currency exposure of the liabilities. For the three months ended March 31, 2016 and 2015, gains (losses) from transactional foreign currency revaluation of $(50) and $0, respectively, were primarily related to the yen denominated fixed payout annuity liabilities. For the three months ended March 31, 2016 and 2015, gains (losses) on instruments used to hedge the foreign currency exposure on the fixed payout annuities were $36 and $(14), respectively.
[2] 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).
[3] 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.
[4] Excludes investments that contain an embedded credit derivative for which the Company has elected the fair value option. For further discussion, see the Fair Value Option section in Note 4 - Fair Value Measurements.
[5] Not included in this amount is the associated liability adjustment for changes in foreign exchange spot rates through realized capital gains (losses) of $(44) and $0 for the three months ended March 31, 2016 and 2015, respectively.
[6] These derivatives are embedded within liabilities and are not held for risk management purposes.
[7] The derivative instruments related to this strategy are held for other investment purposes.