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Investments Derivative Instruments (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 31, 2016
Derivative [Line Items] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ 0 | $ 0 |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | 0 | (20,000,000) | $ (20,700,000) |
Designated as Hedging Instrument [Member] | Ineffective Cash Flow Hedge [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 31,000,000 | 370,000,000 | 18,000,000 | $ 350,000,000
Derivative Assets (Liabilities), at Fair Value, Net | 0 | 0 |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | 0 | (1,300,000) | 200,000 |
Non-hedging Instruments | Interest Rate Swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 | 0 |  |
Non-hedging Instruments | Interest Rate Swaps | Fixed maturities |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 0 | 0 | 750,000,000 |
Derivative Assets (Liabilities), at Fair Value, Net | 0 | 0 |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | 0 | 0 | (23,400,000) |
Non-hedging Instruments | Future [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 | 0 |  |
Closed Positions [Member] | Non-hedging Instruments | Interest Rate Swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 0 | 750,000,000 | 0 |
Derivative Assets (Liabilities), at Fair Value, Net | 0 | 0 |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | 0 | (19,000,000) | 0 |
Closed Positions [Member] | Non-hedging Instruments | Future [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 0 | 135,000,000 | 691,000,000 |
Derivative Assets (Liabilities), at Fair Value, Net | 0 | 0 |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | $ 0 | $ 300,000 | $ 2,500,000 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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