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Investments and Derivative Instruments Level 4 Net Realized Capital Gains (Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Net Realized Capital Gains (Losses) [Line Items]          
Foreign Currency Transaction Gain (Loss), Realized $ (87) $ 16 $ (131) $ 16  
Available-for-sale Securities, Gross Realized Gains [1] 124 121 214 318  
Derivative, Notional Amount 59,225   59,225   $ 62,185
Derivative, Fair Value, Net (984)   (984)   (926)
Gain (Loss) on Investments [Abstract]          
Available-for-sale Securities, Gross Realized Losses 25 112 133 260  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 7 11 30 23  
Periodic Net Coupon Settlements on Credit Derivatives 0 4 0 5  
Derivative, Gain (Loss) on Derivative, Net (17) (27) (48) (30)  
Total Realized Investment Gains (Losses) 53 9 (102) 14  
Gain (Loss) on Investments, Excluding Other than Temporary Impairments 60 20 (72) 37  
Proceeds from Sale of Available-for-sale Securities 4,100 5,600 9,000 11,800  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost 4,998   4,998   19,095
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 4,892   4,892   18,569
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 107   107   526
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 4,040   4,040   3,072
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,862   3,862   2,896
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 178   178   173
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 9,038   9,038   22,167
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 8,754   8,754   21,465
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 285   285   699
Derivative Asset, Fair Value, Gross Asset 1,394   1,394   933
Derivative Liability, Fair Value, Gross Liability 2,077   2,077   1,730
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement 1,533   1,533   1,095
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement 2,517   2,517   2,021
GMWB Hedging Instruments [Member] | UNITED STATES          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 10,532   10,532   10,979
Derivative, Fair Value, Net 203   203   158
Mortgages [Member]          
Gain (Loss) on Investments [Abstract]          
Valuation Allowances and Reserves, Adjustments 0 0 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 92 6 51 43  
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] 1,006   1,006   1,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value [2] 997   997   1,154
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss [2] 10   10   10
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost [2] 1,262   1,262   1,243
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value [2] 1,246   1,246   1,227
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss [2] 16   16   13
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost [2] 2,268   2,268   2,407
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [2] 2,243   2,243   2,381
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [2] 26   26   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 758   758   1,619
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 755   755   1,609
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3   3   10
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 427   427   357
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 389   389   322
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 38   38   35
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 1,185   1,185   1,976
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,144   1,144   1,931
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 41   41   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 548   548   1,726
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 536   536   1,681
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12   12   45
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 413   413   189
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 393   393   178
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 20   20   11
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 961   961   1,915
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 929   929   1,859
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 32   32   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 1,742   1,742   9,206
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,685   1,685   8,866
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 57   57   340
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 1,008   1,008   656
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 932   932   580
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 76   76   76
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 2,750   2,750   9,862
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2,617   2,617   9,446
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 133   133   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 57   57   679
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 55   55   646
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2   2   33
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 129   129   124
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 125   125   110
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 4   4   14
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 186   186   803
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 180   180   756
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 6   6   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 97   97   440
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 95   95   430
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2   2   10
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 21   21   18
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 20   20   17
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1   1   1
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 118   118   458
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 115   115   447
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 3   3   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 587   587   1,349
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 583   583   1,340
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 4   4   9
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 709   709   415
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 693   693   402
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 16   16   13
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 1,296   1,296   1,764
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,276   1,276   1,742
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 20   20   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 2   2   2,432
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 2   2   2,394
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0   0   38
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 0   0   8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0   0   8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0   0   0
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 2   2   2,440
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2   2   2,402
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 0   0   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 4,797   4,797   18,615
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 4,708   4,708   18,120
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 90   90   495
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 3,969   3,969   3,010
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,798   3,798   2,844
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 171   171   163
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost 8,766   8,766   21,625
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 8,506   8,506   20,964
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 261   261   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] 201   201   480
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value [3] 184   184   449
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss [3] 17   17   31
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost [3] 71   71   62
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value [3] 64   64   52
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss [3] 7   7   10
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost [3] 272   272   542
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [3] 248   248   501
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [3] 24   24   41
Other Investments [Member]          
Gain (Loss) on Investments [Abstract]          
Total Realized Investment Gains (Losses) [1] (22) 34 (105) 7  
Other Equity Securities [Member]          
Gain (Loss) on Investments [Abstract]          
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 0 2 0 2  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 3,576   3,576   3,670
Derivative, Fair Value, Net 96   96   (2)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 124   124   57
Derivative Liability, Fair Value, Gross Liability 28   28   59
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 3,433   3,433   3,527
Derivative, Fair Value, Net 115   115   17
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 115   115   50
Derivative Liability, Fair Value, Gross Liability 0   0   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   143
Derivative, Fair Value, Net (19)   (19)   (19)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 9   9   7
Derivative Liability, Fair Value, Gross Liability 28   28   26
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 23   23   23
Derivative, Fair Value, Net 0   0   0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 0   0   0
Derivative Liability, Fair Value, Gross Liability 0   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   23
Derivative, Fair Value, Net 0   0   0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 0   0   0
Derivative Liability, Fair Value, Gross Liability 0   0   0
Not Designated as Hedging Instrument [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 55,626   55,626   58,492
Derivative, Fair Value, Net (1,080)   (1,080)   (924)
Gain (Loss) on Investments [Abstract]          
Derivative, Gain (Loss) on Derivative, Net 42 [4] (11) [4] 13 (46)  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 1,409   1,409   1,038
Derivative Liability, Fair Value, Gross Liability 2,489   2,489   1,962
Not Designated as Hedging Instrument [Member] | UNITED KINGDOM          
Gain (Loss) on Investments [Abstract]          
Derivative, Gain (Loss) on Derivative, Net 79 (17) 121 (31)  
Not Designated as Hedging Instrument [Member] | GMWB Hedging Instruments [Member] | UNITED STATES          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 10,532   10,532   10,979
Derivative, Fair Value, Net 203   203   158
Gain (Loss) on Investments [Abstract]          
Derivative, Gain (Loss) on Derivative, Net 32 (66) 82 (53)  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 360   360   264
Derivative Liability, Fair Value, Gross Liability 157   157   106
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]          
Gain (Loss) on Investments [Abstract]          
Derivative, Gain (Loss) on Derivative, Net 4 7 (20) (5)  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]          
Gain (Loss) on Investments [Abstract]          
Derivative, Gain (Loss) on Derivative, Net 22 1 25 8  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | UNITED KINGDOM          
Gain (Loss) on Investments [Abstract]          
Derivative, Gain (Loss) on Derivative, Net 0        
Not Designated as Hedging Instrument [Member] | Macro Hedge Program [Member] | UNITED STATES          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 4,699   4,699   4,548
Derivative, Fair Value, Net 147   147   147
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 185   185   179
Derivative Liability, Fair Value, Gross Liability 38   38   32
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Not Designated as Hedging Instrument [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 928   928   895
Derivative, Fair Value, Net 32   32   79
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 32   32   79
Derivative Liability, Fair Value, Gross Liability 0   0   0
Put Option [Member] | Not Designated as Hedging Instrument [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 500   500   500
Derivative, Fair Value, Net 4   4   7
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 4   4   7
Derivative Liability, Fair Value, Gross Liability 0   0   0
GMWB Reinsurance [Member] | Not Designated as Hedging Instrument [Member] | UNITED STATES          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 2,905   2,905   3,106
Derivative, Fair Value, Net 106   106   83
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 106   106   83
Derivative Liability, Fair Value, Gross Liability 0   0   0
GMWB Product Derivatives [Member] | Not Designated as Hedging Instrument [Member] | UNITED STATES          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount [5] 14,072   14,072   15,099
Derivative, Fair Value, Net [5] (412)   (412)   (262)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset [5] 0   0   0
Derivative Liability, Fair Value, Gross Liability [5] 412   412   262
Equity Contract [Member] | GMWB Hedging Instruments [Member] | UNITED STATES          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 1,395   1,395   1,362
Derivative, Fair Value, Net 0   0   2
Equity Contract [Member] | Not Designated as Hedging Instrument [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 1,441   1,441   419
Derivative, Fair Value, Net 1   1   15
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 30   30   41
Derivative Liability, Fair Value, Gross Liability 29   29   26
Credit Derivatives in Offsetting Positions [Member] | Not Designated as Hedging Instrument [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 3,905   3,905   4,059
Derivative, Fair Value, Net (2)   (2)   (2)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 46   46   40
Derivative Liability, Fair Value, Gross Liability 48   48   42
Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount [6] 1,842   1,842   2,458
Derivative, Fair Value, Net [6] 0   0   (13)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset [6] 13   13   9
Derivative Liability, Fair Value, Gross Liability [6] 13   13   22
Credit Default Swap, Buying Protection [Member] | Not Designated as Hedging Instrument [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 227   227   423
Derivative, Fair Value, Net (5)   (5)   18
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 1   1   22
Derivative Liability, Fair Value, Gross Liability 6   6   4
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 356   356   653
Derivative, Fair Value, Net 26   26   17
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 26   26   17
Derivative Liability, Fair Value, Gross Liability 0   0   0
Interest Rate Contract [Member] | GMWB Hedging Instruments [Member] | UNITED STATES          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 3,716   3,716   3,740
Derivative, Fair Value, Net 37   37   25
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 13,156   13,156   14,290
Derivative, Fair Value, Net (919)   (919)   (814)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 606   606   297
Derivative Liability, Fair Value, Gross Liability 1,525   1,525   1,111
Macro Hedge Program [Member] | UNITED STATES          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 4,699   4,699   4,548
Derivative, Fair Value, Net 147   147   147
Macro Hedge Program [Member] | Not Designated as Hedging Instrument [Member] | UNITED STATES          
Gain (Loss) on Investments [Abstract]          
Derivative, Gain (Loss) on Derivative, Net (20) $ (23) (34) $ (27)  
Other Liabilities [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 32,001   32,001   19,358
Derivative, Fair Value, Net (992)   (992)   (798)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 1,030   1,030   524
Derivative Liability, Fair Value, Gross Liability 2,022   2,022   1,322
Fixed Maturities [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 388   388   425
Derivative, Fair Value, Net 1   1   (3)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 1   1   0
Derivative Liability, Fair Value, Gross Liability 0   0   3
Other Investments [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 8,882   8,882   23,253
Derivative, Fair Value, Net 309   309   1
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 364   364   409
Derivative Liability, Fair Value, Gross Liability 55   55   408
Reinsurance Recoverable [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 3,832   3,832   4,000
Derivative, Fair Value, Net 138   138   162
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 138   138   162
Derivative Liability, Fair Value, Gross Liability 0   0   0
Other Policyholder Funds and Benefits Payable [Member]          
Net Realized Capital Gains (Losses) [Line Items]          
Derivative, Notional Amount 14,122   14,122   15,149
Derivative, Fair Value, Net (440)   (440)   (288)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]          
Derivative Asset, Fair Value, Gross Asset 0   0   0
Derivative Liability, Fair Value, Gross Liability $ 440   $ 440   $ 288
[1] Primarily consists of changes in the value of non-qualifying derivatives and transactional foreign currency revaluation gains (losses). For the three months ended June 30, 2016 and 2015, transactional foreign currency revaluation gains (losses) were $(87) and $16, respectively, and related to yen denominated fixed payout annuity liabilities as well as the change in equity of a P&C runoff entity in the United Kingdom, which were largely offset by gains (losses) of $79 and $(17), 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 June 30, 2016, and December 31, 2015, excludes equity securities, FVO which are included in equity securities, AFS on the Condensed Consolidated Balance Sheets.
[4] Not included in this amount is the associated liability adjustment for changes in foreign exchange spot rates through realized capital gains (losses) of $(64) and $16 for the three months ended June 30, 2016 and 2015, respectively, and $(108) and $16 for the six months ended June 30, 2016 and 2015, respectively.
[5] These derivatives are embedded within liabilities and are not held for risk management purposes.
[6] The derivative instruments related to this strategy are held for other investment purposes.