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DAC, VOBA, DSI, and DFEL (VOBA) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in VOBA [Roll Forward] |  |  |  |
Balance as of beginning-of-year |  | $ 891 | $ 893 | $ 649
Business acquired (sold) through reinsurance |  |  |  | (22)
Deferrals |  | 7 | 3 | 8
Amortization: |  |  |  |
Amortization, excluding unlocking |  | (105) | (108) | (129)
Unlocking |  | (48) | 36 | (82)
Accretion of interest | [1] | 52 | 52 | 56
Adjustment related to realized (gains) losses |  | (1) | (2) | (1)
Adjustment related to unrealized (gains) losses |  | (280) | 17 | 414
Balance as of end-of-year |  | $ 516 | $ 891 | $ 893
Interest accrual rate, low end |  | 4.20% |  |
Interest accrual rate, high end |  | 6.90% |  |
[1] | The interest accrual rates utilized to calculate the accretion of interest ranged from 4.2% to 6.9%.

X
- Definition States the assumed long-term market interest rate used in the determination of the present value of future profits on long-duration contracts acquired in a business combination, high end of range. + References No definition available. + Details
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- Definition States the assumed long-term market interest rate used in the determination of the present value of future profits on long-duration contracts acquired in a business combination, low end of range. + References No definition available. + Details
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- Definition Amount of addition (disposition) for present value of future profits of insurance contract acquired (sold) in business combination. + References No definition available. + Details
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- Definition The amount of adjustment to amortization of the present value of future profits asset arising from a revision in estimated gross profit (when such amount serves as the basis for allocating amortization of VOBA to reporting periods). + References No definition available. + Details
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- Definition Amount of amortization of the present value of future profits asset due to realized investment gains (losses). + References No definition available. + Details
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- Definition Amount of amortization of the present value of future profits asset due to unrealized investment gains (losses). + References No definition available. + Details
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- Definition Total amount of additions in present value of future profits asset from sources other than acquisitions of insurance entities during the income statement period. + References No definition available. + Details
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- Definition The amount of other amortization of the present value of future profits asset during the period. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of amortization expense for present value of future profits of insurance contract acquired in business combination from accrued interest on unamortized balance. + References No definition available. + Details
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- Definition Amount, after accumulated amortization, of present value of future profits of insurance contract acquired in business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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