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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

X

- 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

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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

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+ References

No definition available.

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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)
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