Average debt service coverage ratio.

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

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

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

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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.

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

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Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that have been derecognized. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

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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.

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Describes the terms of arrangements (for example, liquidity arrangements, guarantees, or other commitments) by third parties that may affect the fair value or risk of the reporting entity's variable interest in the Variable Interest Entity (VIE).

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

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

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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.

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No definition available.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that continue to be recognized in the statement of financial position. Includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

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No definition available.

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Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Investment Holding Level 4 Mortgage Loans (Details)	3 Months Ended	6 Months Ended
Investment Holding Level 4 Mortgage Loans (Details)	Mar. 31, 2016	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Mortgage Loans on Real Estate [Line Items]
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan		50.00%
Variable Interest Entity, Commitments by Third Parties, Liquidity and Other Arrangements	As of June 30, 2017 and December 31, 2016, the Company has outstanding commitments totaling $1.1 billion and $1.2 billion, respectively, whereby the Company is committed to fund these investments and may be called by the partnership during the commitment period to fund the purchase of new investments and partnership expenses.	As of June 30, 2017 and December 31, 2016, the Company has outstanding commitments totaling $1.1 billion and $1.2 billion, respectively, whereby the Company is committed to fund these investments and may be called by the partnership during the commitment period to fund the purchase of new investments and partnership expenses.
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		$ 5,796,000,000		$ 5,697,000,000
Movement in Mortgage Loans on Real Estate [Roll Forward]
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan		62.00%
Servicing Asset [Abstract]
Servicing Asset at Fair Value, Amount		$ 0		0
Commercial Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate		5,800,000,000		5,700,000,000
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		5,796,000,000		5,697,000,000
Movement in Mortgage Loans on Real Estate [Roll Forward]
Allowance for Loan and Lease Losses, Real Estate		1,000,000	$ 19,000,000	$ 19,000,000	$ 23,000,000
Allowance for Loan and Lease Losses, Period Increase (Decrease)		1,000,000	0
Allowance for Loan and Lease Losses, Write-offs		$ 19,000,000	$ 4,000,000
Average Debt Service Coverage Ratio		2.69		2.70
Allowance for Loan and Lease Losses [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		$ 29,000,000		$ 31,000,000
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
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		0		1
Mortgages [Member] \| Commercial Loan [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans				15,000,000
Mortgage Loans on Real Estate, Write-down or Reserve, Amount				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		$ 5,000,000		$ 20,000,000
Movement in Mortgage Loans on Real Estate [Roll Forward]
Average Debt Service Coverage Ratio		1.36		0.59
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		$ 416,000,000		$ 568,000,000
Movement in Mortgage Loans on Real Estate [Roll Forward]
Average Debt Service Coverage Ratio		2.23		2.17
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		$ 5,375,000,000		$ 5,109,000,000
Movement in Mortgage Loans on Real Estate [Roll Forward]
Average Debt Service Coverage Ratio		2.73		2.78
East North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		$ 293,000,000		$ 293,000,000
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		544,000,000		534,000,000
Mountain [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		76,000,000		61,000,000
New England [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		388,000,000		345,000,000
Pacific [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		1,671,000,000		1,609,000,000
South Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		1,265,000,000		1,198,000,000
West North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		40,000,000		40,000,000
West South Central [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		347,000,000		338,000,000
Region Others [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		$ 1,158,000,000		$ 1,265,000,000
Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		100.00%		100.00%
Mortgages [Member] \| East North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		5.10%		5.10%
Mortgages [Member] \| East South Central [Member] [Domain]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		0.20%		0.20%
Mortgages [Member] \| Middle Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		9.40%		9.40%
Mortgages [Member] \| Mountain [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		1.30%		1.10%
Mortgages [Member] \| New England [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		6.70%		6.10%
Mortgages [Member] \| Pacific [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		28.80%		28.30%
Mortgages [Member] \| South Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		21.80%		21.00%
Mortgages [Member] \| West North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		0.70%		0.70%
Mortgages [Member] \| West South Central [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		6.00%		5.90%
Mortgages [Member] \| Region Others [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		20.00%		22.20%
agriculture loans [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		$ 4,000,000		$ 16,000,000
agriculture loans [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		0.10%		0.30%
Industrial Property [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		$ 1,439,000,000		$ 1,468,000,000
Industrial Property [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		24.80%		25.70%
Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		$ 25,000,000		$ 25,000,000
Hotel [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		0.40%		0.40%
Multifamily [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		$ 1,504,000,000		$ 1,365,000,000
Multifamily [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		25.90%		24.00%
Office Building [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		$ 1,389,000,000		$ 1,361,000,000
Office Building [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		24.00%		23.90%
Retail Site [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		$ 1,000,000,000		$ 1,036,000,000
Retail Site [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		17.30%		18.20%
Other Property [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages		$ 435,000,000		$ 426,000,000
Other Property [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets		7.50%		7.50%
Commercial Loan [Member]
Servicing Asset [Abstract]
Servicing Asset at Amortized Cost, Fair Value		$ 1,100,000,000		$ 901,000,000
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding		310,000,000		251,000,000
Investments [Member] \| Commercial Loan [Member]
Servicing Asset [Abstract]
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding		783,000,000		650,000,000
Separate Accounts [Member] \| Commercial Loan [Member]
Servicing Asset [Abstract]
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding		$ 141,000,000		$ 124,000,000