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Schedule V - Valuation Allowances and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for reinsurance recoverables |  |  |
Valuation allowances and qualifying accounts |  |  |
Balance as of beginning of period | $ 84 | $ 80 | $ 95
Additions, Charged to costs and expenses | (10) | 5 | (15)
Additions, Other additions | 0 | 0 | 0
Deductions | 4 | 1 | 0
Balance as of end of period | 70 | 84 | 80
Allowance for premium installment receivable |  |  |
Valuation allowances and qualifying accounts |  |  |
Balance as of beginning of period | 84 | 90 | 83
Additions, Charged to costs and expenses | 109 | 107 | 107
Additions, Other additions | 0 | 0 | 0
Deductions | 116 | 113 | 100
Balance as of end of period | 77 | 84 | 90
Allowance for deferred tax assets |  |  |
Valuation allowances and qualifying accounts |  |  |
Balance as of beginning of period | 0 | 0 | 0
Additions, Charged to costs and expenses | 0 | 0 | 0
Additions, Other additions | 0 | 0 | 0
Deductions | 0 | 0 | 0
Balance as of end of period | 0 | 0 | 0
Allowance for estimated losses on mortgage loans |  |  |
Valuation allowances and qualifying accounts |  |  |
Balance as of beginning of period | 3 | 3 | 8
Additions, Charged to costs and expenses | 1 | 0 | (4)
Additions, Other additions | 0 | 0 | 0
Deductions | 1 | 0 | 1
Balance as of end of period | $ 3 | $ 3 | $ 3

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to accounts other than costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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