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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Percentage of gross unrealized losses depressed less than twenty percent of cost or amortized cost.

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- Definition

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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- 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.

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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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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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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)	9 Months Ended
Investment Holding Level 4 Mortgage Loans (Details)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Mortgage Loans on Real Estate [Line Items]
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost	92.00%
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 6,058,000,000		$ 5,697,000,000
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan	50.00%
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan	62.00%
Servicing Asset [Abstract]
Servicing Asset at Fair Value, Amount	$ 0		0
Industrial Property [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	1,495,000,000		1,468,000,000
Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	25,000,000		25,000,000
Multifamily [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	1,699,000,000		1,365,000,000
Office Building [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	1,436,000,000		1,361,000,000
Retail Site [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	967,000,000		1,036,000,000
Other Property [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	436,000,000		442,000,000
East North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	305,000,000		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	592,000,000		534,000,000
Mountain [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	85,000,000		61,000,000
New England [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	386,000,000		345,000,000
Pacific [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	1,604,000,000		1,609,000,000
South Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	1,296,000,000		1,198,000,000
West North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	149,000,000		40,000,000
West South Central [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	474,000,000		338,000,000
Region Others [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	1,153,000,000		1,265,000,000
Commercial Loan [Member]
Servicing Asset [Abstract]
Servicing Asset at Amortized Cost, Fair Value	1,300,000,000		901,000,000
Continuing Involvement with Transferred Financial Assets, Amount Outstanding [Abstract]
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding	379,000,000		251,000,000
Commercial Loan [Member] \| Separate Accounts [Member]
Continuing Involvement with Transferred Financial Assets, Amount Outstanding [Abstract]
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding	140,000,000		124,000,000
Commercial Loan [Member] \| Investments [Member]
Continuing Involvement with Transferred Financial Assets, Amount Outstanding [Abstract]
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding	879,000,000		650,000,000
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
Allowance for Loan and Lease Losses [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 43,000,000		$ 31,000,000
Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	100.00%		100.00%
Mortgages [Member] \| Industrial Property [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	24.70%		25.70%
Mortgages [Member] \| Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	0.40%		0.40%
Mortgages [Member] \| Multifamily [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	28.00%		24.00%
Mortgages [Member] \| Office Building [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	23.70%		23.90%
Mortgages [Member] \| Retail Site [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	16.00%		18.20%
Mortgages [Member] \| Other Property [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	7.20%		7.80%
Mortgages [Member] \| East North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	5.00%		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	9.80%		9.40%
Mortgages [Member] \| Mountain [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	1.40%		1.10%
Mortgages [Member] \| New England [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	6.40%		6.10%
Mortgages [Member] \| Pacific [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	26.50%		28.30%
Mortgages [Member] \| South Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	21.40%		21.00%
Mortgages [Member] \| West North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	2.50%		0.70%
Mortgages [Member] \| West South Central [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	7.80%		5.90%
Mortgages [Member] \| Region Others [Member]
Mortgage Loans on Real Estate [Line Items]
Investment Owned, Percent of Net Assets	19.00%		22.20%
Commercial Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate	$ 6,100,000,000		$ 5,700,000,000
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 6,058,000,000		$ 5,697,000,000
Average Debt Service Coverage Ratio	2.67		2.70
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract]
Allowance for Loan and Lease Losses, Real Estate	$ 19,000,000	$ 23,000,000
Allowance for Loan and Lease Losses, Real Estate	1,000,000	19,000,000
Allowance for Loan and Lease Losses Write-offs, Net [Abstract]
Allowance for Loan and Lease Losses, Period Increase (Decrease)	2,000,000	0
Allowance for Loan and Lease Losses, Write-offs	20,000,000	$ 4,000,000
Commercial Loan [Member] \| LTV 80 to 100 Percent [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 5,000,000		$ 20,000,000
Average Debt Service Coverage Ratio	1.36		0.59
Commercial Loan [Member] \| LTV Between 65 to 80 Percent [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 371,000,000		$ 568,000,000
Average Debt Service Coverage Ratio	2.07		2.17
Commercial Loan [Member] \| LTV Less than 65 Percent [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 5,682,000,000		$ 5,109,000,000
Average Debt Service Coverage Ratio	2.71		2.78
Commercial Loan [Member] \| Nonperforming Financial Instruments [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans	$ 0		$ 1
Commercial Loan [Member] \| Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
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