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Investments (Realized Gain (Loss) Related To Certain Investments) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Realized gain (loss) related to certain investments |  |  |  |
Gain (loss) on other investments |  | $ (12) | $ (68) | $ (9)
Associated amortization of DAC, VOBA, DSI and DFEL and changes in other contract holder funds |  | (21) | (24) | (26)
Total realized gain (loss) related to certain investments, pre-tax | [1] | (72) | (250) | (88)
Fixed maturity AFS securities [Member] |  |  |  |
Realized gain (loss) related to certain investments |  |  |  |
AFS securities. Gross gains | [2] | 19 | 70 | 43
AFS securities. Gross losses | [2] | (64) | (234) | (99)
Equity AFS securities [Member] |  |  |  |
Realized gain (loss) related to certain investments |  |  |  |
AFS securities. Gross gains |  | $ 6 | 7 | $ 3
AFS securities. Gross losses |  |  | $ (1) |
[1] | See "Realized Gain (Loss) Related to Certain Investments" section in Note 5.
[2] | These amounts are represented net of related fair value hedging activity. See Note 6 for more information.

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- Definition Represents the amortization of deferred acquisition costs, value of business acquired, deferred sales inducements and deferred front-end loads and changes in other contract holder funds and funds withheld reinsurance liabilities associated with realized gains and losses related to certain investments. + References No definition available. + Details
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