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

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))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6873192&loc=d3e21338-158488

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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-Paragraph 11B
-Subparagraph (c)(3)
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-Name Accounting Standards Codification
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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Paragraph 7
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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
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-Subparagraph (SX 210.12-12.3)
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
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-Section S99
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
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-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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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

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
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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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Investment Holding Level 4 Mortgage Loans (Details)	9 Months Ended
Investment Holding Level 4 Mortgage Loans (Details)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 2,856,000,000		$ 2,918,000,000
Movement in Mortgage Loans on Real Estate [Roll Forward]
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan	53.00%
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan	63.00%
Commercial Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate	$ 2,875,000,000		2,937,000,000
Allowance for Loan and Lease Losses, Real Estate	(19,000,000)	$ (19,000,000)	(19,000,000)	$ (15,000,000)
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	2,856,000,000		$ 2,918,000,000
Movement in Mortgage Loans on Real Estate [Roll Forward]
Allowance for Loan and Lease Losses, Period Increase (Decrease)	0	4,000,000
Allowance for Loan and Lease Losses, Write-offs	$ 0	$ 0
Average Debt Service Coverage Ratio	2.53		2.45
Nonperforming Financial Instruments [Member] \| Commercial Loan [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans	$ 1		$ 1
Mortgages [Member] \| Commercial Loan [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			15,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status	15,000,000
Financing Receivable, Allowance for Credit Losses	16,000,000		16,000,000
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	$ 15,000,000		$ 15,000,000
Movement in Mortgage Loans on Real Estate [Roll Forward]
Average Debt Service Coverage Ratio	0.45		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	$ 265,000,000		$ 280,000,000
Movement in Mortgage Loans on Real Estate [Roll Forward]
Average Debt Service Coverage Ratio	2.15		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	$ 2,576,000,000		$ 2,623,000,000
Movement in Mortgage Loans on Real Estate [Roll Forward]
Average Debt Service Coverage Ratio	2.59		2.54
Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	0.00%		0.00%
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 North Central [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	1.90%		2.30%
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
East South Central [Member] [Domain] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	0.50%		0.50%
Middle Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 210,000,000		$ 210,000,000
Middle Atlantic [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	7.40%		7.20%
New England [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 138,000,000		$ 163,000,000
New England [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	4.80%		5.60%
Pacific [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 910,000,000		$ 933,000,000
Pacific [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	31.90%		32.00%
South Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 585,000,000		$ 579,000,000
South Atlantic [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	20.50%		19.80%
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
West South Central [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	4.50%		4.30%
Region Others [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 817,000,000		$ 828,000,000
Region Others [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	28.50%		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	$ 830,000,000		$ 829,000,000
Industrial Property [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	29.10%		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	$ 568,000,000		$ 557,000,000
Multifamily [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	19.90%		19.10%
Office Building [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 663,000,000		$ 729,000,000
Office Building [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	23.20%		25.00%
Retail Site [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 614,000,000		$ 650,000,000
Retail Site [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	21.50%		22.30%
Other Property [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 140,000,000		$ 111,000,000
Other Property [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	4.80%		3.80%
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
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