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Investments and Derivative Instruments Level 4 Investment Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net Investment Income [Line Items]      
Fair Value, Concentration of Risk, Investments $ 0    
Net Investment Income [Abstract]      
Net Investment Income 1,456 $ 1,543 $ 1,683
Investment Income, Investment Expense (59) (72) (76)
Net Realized Capital Gains (Losses) [Abstract]      
Gain on Derivative Instruments, Pretax [1] 239 264 2,196
Loss on Derivative Instruments, Pretax (211) (235) (700)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net (61) (29) (45)
Derivative, Gain (Loss) on Derivative, Net [2] (97) 723 (1,705)
Periodic Net Coupon Settlements on Credit Derivatives 6 11 (3)
Gain (Loss) on Reinsurance Recoverables 0 579 1,107
Gain (Loss) on Coinsurance and Modified Coinsurance Reinsurance Contracts 46 395 (1,405)
Realized Investment Gains (Losses) (146) 577 326
Liability for assumed GMDB Reinsurance 14 (170) 795
Other net realized capital gains (losses) (85) 606 (1,190)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status 1 0 1
JAPAN      
Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net [3] 0 (126) (963)
Foreign Currency Transaction Gain (Loss), before Tax   (2) (55)
Three Win Related Foreign Currency Swaps [Member] | JAPAN      
Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net [4] 0 (14) 6
Change in Unrealized Gain (Loss) on Hedged Item in Foreign Currency Fair Value Hedge 4 116 250
Fixed Annuity Hedging Instruments [Member] | JAPAN      
Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net [5] 0 22 (207)
Change in Unrealized Gain (Loss) on Hedged Item in Foreign Currency Fair Value Hedge   (51) 324
Foreign Exchange Contract [Member]      
Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net 5 4 4
Foreign Exchange Contract [Member] | JAPAN      
Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net [6] (21) (148) (268)
GMAB, GMWB, and GMIB Reinsurance Contracts [Member]      
Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net 0 579 1,107
Change in value of derivatives and Japan FVO securities [Member]      
Net Realized Capital Gains (Losses) [Abstract]      
Foreign Currency Transaction Gain (Loss), before Tax   37 (318)
Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Net Realized Capital Gains (Losses) [Abstract]      
Other net realized capital gains (losses) (27) 1 1,392 [7]
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Retirement Plans and Individual Life Businesses [Member]      
Net Realized Capital Gains (Losses) [Abstract]      
Other net realized capital gains (losses)     1,500
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Net Realized Capital Gains (Losses) [Abstract]      
Other net realized capital gains (losses) 0 1,000 1,400
Debt Securities [Member]      
Sale of Available-for-sale Securities [Abstract]      
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds 9,454 9,084 19,190
Available-for-sale Securities, Gross Realized Gains [8] 195 210 1,867
Available-for-sale Securities, Gross Realized Losses (161) (183) (421)
Equity Securities [Member]      
Sale of Available-for-sale Securities [Abstract]      
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds 586 107 81
Available-for-sale Securities, Gross Realized Gains 26 9 254
Available-for-sale Securities, Gross Realized Losses (26) (6) (263)
Fixed Maturities [Member]      
Net Investment Income [Abstract]      
Net Investment Income [9] 1,095 1,113 1,253
Equity Securities [Member]      
Net Investment Income [Abstract]      
Net Investment Income 7 14 8
Net Realized Capital Gains (Losses) [Abstract]      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net (14) (1) (9)
Mortgage Loans on Real Estate [Member]      
Net Investment Income [Abstract]      
Net Investment Income 152 156 172
Policy Loans [Member]      
Net Investment Income [Abstract]      
Net Investment Income 82 80 82
Limited Partnerships and Other Alternative Investments [Member]      
Net Investment Income [Abstract]      
Net Investment Income 97 141 119
Other Investments [Member]      
Net Investment Income [Abstract]      
Net Investment Income [10] 82 111 125
Net Realized Capital Gains (Losses) [Abstract]      
Realized Investment Gains (Losses) [11] (28) (258) 106
Available-for-sale Securities [Member]      
Net Investment Income [Abstract]      
Net Investment Income 1,456 1,543 1,683
Mortgage Loans on Real Estate [Member]      
Net Realized Capital Gains (Losses) [Abstract]      
Valuation Allowances and Reserves, Adjustments 4 4 1
Macro Hedge Program [Member] | UNITED STATES      
Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (46) (11) (234)
Variable Annuity [Member]      
Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (133) (132) (935)
Not Designated as Hedging Instrument [Member]      
Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (7)    
Not Designated as Hedging Instrument [Member] | Macro Hedge Program [Member] | UNITED STATES      
Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (46) (11) (234)
Not Designated as Hedging Instrument [Member] | GMWB Derivatives, Net [Member] | UNITED STATES      
Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (87) 5 262
Not Designated as Hedging Instrument [Member] | Variable Annuity [Member] | UNITED STATES      
Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net $ (133) (6) 28
Cash Flow Hedging [Member] | Retirement Plans and Individual Life Businesses [Member] | Retirement Plans and Individual Life Businesses [Member] | UNITED STATES      
Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net [6]     $ 71
Guaranteed Insurance Contract, Type of Guarantee [Domain]      
Net Realized Capital Gains (Losses) [Abstract]      
Liability for assumed GMDB Reinsurance   $ (213)  
[1] Includes $1.5 billion of gross gains relating to the sales of the Retirement Plans and Individual Life businesses in the year ended December 31, 2013.
[2] [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 2 - Fair Value Measurements.
[3] [3] Includes $(2) and $(55) of transactional foreign currency re-valuation losses for the years ended December 31, 2014 and 2013, respectively
[4] [2] For the years ended December 31, 2014 and 2013, includes the transactional foreign currency re-valuation gains (losses) of $(51) and $324, respectively, related to the Japan fixed annuity product, as well as the change in value related to the derivative hedging instruments and the Japan government FVO securities of $37, and $(318), respectively.
[5] he associated liability is adjusted for changes in spot rates through realized capital gains and losses and was $(51) and $324 for the years ended December 31, 2014, and 2013, respectively.
[6] he associated liability is adjusted for changes in spot rates through realized capital gains and was $4, $116 and $250 for the years ended December 31, 2015, 2014 and 2013, respectively, which is not presented in this table.
[7] The December 31, 2013 amounts includes $1.5 billion of net unrealized gains on securities relating to the sales of the Retirement Plans and Individual Life businesses.
[8] Includes $1.5 billion of gross gains relating to the sales of the Retirement Plans and Individual Life businesses for the year ended December 31, 2013.
[9] Includes net investment income on short-term investments.
[10] Includes income from derivatives that hedge fixed maturities and qualify for hedge accounting.
[11] [4]Other, net gains and losses include transactional foreign currency revaluation gains (losses) on the yen denominated fixed payout annuity liabilities and gains (losses) on non-qualifying derivatives used to hedge the foreign currency exposure of the liabilities. Gains (losses) from transactional foreign currency revaluation of the reinsured liabilities were $4, $116, and $250, respectively, for the years ended December 31, 2015, 2014 and 2013. Gains (losses) on the instruments used to hedge the foreign currency exposure on the reinsured fixed payout annuities were $(21), $(148), and $(268), respectively, for the years ended December 31, 2015, 2014 and 2013. Includes $71 of gains relating to the sales of the Retirement Plans and Individual Life businesses for the year ended December 31, 2013 as well as changes in value of non-qualifying derivatives. Also includes for the year ended December 31, 2014 a loss of $(213) related to the recapture of the GMIB/GMAB/GMWB reinsurance contracts, which is offset by gains on the termination of the embedded derivative reflected in the GMIB/GMAB/GMWB reinsurance line.