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Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |
Balance, beginning of period | $ 645 | $ 636 | $ 623
Deferred costs | 1,377 | 1,378 | 1,377
Amortization — DAC | (1,372) | (1,377) | (1,364)
Add: Maxum acquisition | 0 | 8 | 0
Balance, end of period | $ 650 | $ 645 | $ 636

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- Definition Deferred Policy Acquisition Costs, Acquired as Part of Business Combination + References No definition available. + Details
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- Definition Amount of other increase (decrease) to amortization expense of deferred policy acquisition cost (DAC). + References No definition available. + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6487548&loc=d3e32546-158582 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057816&loc=d3e11446-158418 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column B)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6481648&loc=d3e11198-158413 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column B)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 Reference 6: 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(a)(7)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Total amount of policy acquisition costs capitalized during the income statement period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 + 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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