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Segment Information (Reconciliation of Amortization of DAC and VOBA, Net of Interest from Segments to Consolidated Net Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amortization of DAC and VOBA, Net of Interest |  |  |
Amortization of DAC and VOBA, net of interest | $ 976 | $ 1,271 | $ 1,283
Annuities Segment [Member] |  |  |
Amortization of DAC and VOBA, Net of Interest |  |  |
Amortization of DAC and VOBA, net of interest | 401 | 383 | 342
Retirement Plan Services Segment [Member] |  |  |
Amortization of DAC and VOBA, Net of Interest |  |  |
Amortization of DAC and VOBA, net of interest | 27 | 28 | 30
Life Insurance Segment [Member] |  |  |
Amortization of DAC and VOBA, Net of Interest |  |  |
Amortization of DAC and VOBA, net of interest | 469 | 734 | 831
Group Protection Segment [Member] |  |  |
Amortization of DAC and VOBA, Net of Interest |  |  |
Amortization of DAC and VOBA, net of interest | $ 79 | $ 126 | $ 80

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- Definition The amount of deferred policy acquisition costs charged to expense in the period, net of interest, and the amount of the present value of future profits asset that was amortized during the period, net of interest. + References No definition available. + Details
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- References No definition available. + Details
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- Details
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- Details
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- Details
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