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Investment Holding Level 4 Mortgage Loans (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
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 |

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