Average debt service coverage ratio.

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- Definition

Current weighted average loan to value ratio of commercial mortgage loan.

+ References

No definition available.

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- Definition

Original weighted average loan to value ratio of commercial mortgage loan.

+ References

No definition available.

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- Definition

Valuation Allowance, Loss Contingency for Loans, LTV Ratio

+ References

No definition available.

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- Definition

Amount of increase (decrease) of allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
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- Definition

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

+ References

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-Publisher FASB
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-SubTopic 310
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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Total carrying amount of mortgage loans as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The carrying amount of the outstanding balance due under the mortgage loan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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.

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- Definition

Amount of principal due on loans that have been delinquent, which may exclude loans having interest delinquent for three months or less, as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

Amount of reserve for write-down of a mortgage loan on real estate.

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- Definition

Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Investment Holding Level 4 Mortgage Loans on Real Estate (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Mortgage Loans on Real Estate [Line Items]
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan	51.00%
Valuation Allowance, Loss Contingency for Loans, LTV Ratio	90.00%
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 2,811,000,000	$ 2,918,000,000
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan	63.00%
Secured Debt, Repurchase Agreements	$ 0
Commercial Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate	2,800,000,000	2,900,000,000
Allowance for Loan and Lease Losses, Real Estate	19,000,000	19,000,000	$ 15,000,000	$ 12,000,000
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	2,811,000,000	2,918,000,000
Allowance for Loan and Lease Losses, Period Increase (Decrease)	0	4,000,000	4,000,000
Allowance for Loan and Lease Losses, Write-offs	$ 0	$ 0	$ 1,000,000
Average Debt Service Coverage Ratio	2.55	2.45
Mortgages [Member] \| Commercial Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans	$ 15,000,000	$ 0
Mortgage Loans on Real Estate, Write-down or Reserve, Amount	16,000,000	0
LTV 80 to 100 Percent [Member] \| Commercial Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 20,000,000	$ 15,000,000
Average Debt Service Coverage Ratio	0.59	0.91
LTV Between 65 to 80 Percent [Member] \| Commercial Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 182,000,000	$ 280,000,000
Average Debt Service Coverage Ratio	2.17	1.78
LTV Less than 65 Percent [Member] \| Commercial Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 2,609,000,000	$ 2,623,000,000
Average Debt Service Coverage Ratio	2.61	2.54
East North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 54,000,000	$ 66,000,000
East South Central [Member] [Domain]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	14,000,000	14,000,000
Middle Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	237,000,000	210,000,000
New England [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	93,000,000	163,000,000
Pacific [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	814,000,000	933,000,000
South Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	613,000,000	579,000,000
West South Central [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	128,000,000	125,000,000
Region Others [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 858,000,000	$ 828,000,000
Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	0.00%	0.00%
Mortgages [Member] \| East North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	1.90%	2.30%
Mortgages [Member] \| East South Central [Member] [Domain]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	0.50%	0.50%
Mortgages [Member] \| Middle Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	8.40%	7.20%
Mortgages [Member] \| New England [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	3.30%	5.60%
Mortgages [Member] \| Pacific [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	29.00%	32.00%
Mortgages [Member] \| South Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	21.80%	19.80%
Mortgages [Member] \| West South Central [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	4.60%	4.30%
Mortgages [Member] \| Region Others [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	30.50%	28.30%
agriculture loans [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 16,000,000	$ 16,000,000
agriculture loans [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	0.60%	0.50%
Industrial Property [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 793,000,000	$ 829,000,000
Industrial Property [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	28.20%	28.40%
Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 25,000,000	$ 26,000,000
Hotel [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	0.90%	0.90%
Multifamily [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 535,000,000	$ 557,000,000
Multifamily [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	19.00%	19.10%
Office Building [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 605,000,000	$ 729,000,000
Office Building [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	21.50%	25.00%
Retail Site [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 611,000,000	$ 650,000,000
Retail Site [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	21.80%	22.30%
Other Property [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 226,000,000	$ 111,000,000
Other Property [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	8.00%	3.80%
Allowance for Loan and Lease Losses [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 31,000,000	$ 39,000,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 0	$ 0