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Investment Holding Level 4 Mortgage Loans (Details) | 9 Months Ended |  |
--- | --- | --- | ---
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 | $ 5,611,000,000 |  | $ 5,624,000,000 |
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 | 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 | 5,630,000,000 |  | 5,647,000,000 |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | 5,611,000,000 |  | 5,624,000,000 |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |
Allowance for Loan and Lease Losses, Real Estate | 19,000,000 | $ 20,000,000 | $ 23,000,000 | $ 18,000,000
Allowance for Loan and Lease Losses, Period Increase (Decrease) | 0 | 4,000,000 |  |
Allowance for Loan and Lease Losses, Write-offs | $ 4,000,000 | $ 2,000,000 |  |
Average Debt Service Coverage Ratio | 2.68 |  | 2.63 |
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 |  | $ 82,000,000 |
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 | 1 |  | 2 |
Mortgages [Member] | Commercial Loan [Member] |  |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 15,000,000 |  | 17,000,000 |
Financing Receivable, Allowance for Credit Losses | 16,000,000 |  | 20,000,000 |
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 |  | $ 24,000,000 |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |
Average Debt Service Coverage Ratio | 0.45 |  | 0.81 |
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 | $ 640,000,000 |  | $ 623,000,000 |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |
Average Debt Service Coverage Ratio | 2.06 |  | 1.82 |
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 | $ 4,956,000,000 |  | $ 4,977,000,000 |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |
Average Debt Service Coverage Ratio | 2.79 |  | 2.75 |
East North Central [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 294,000,000 |  | $ 289,000,000 |
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 | 418,000,000 |  | 384,000,000 |
Mountain [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | 35,000,000 |  | 32,000,000 |
New England [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | 400,000,000 |  | 446,000,000 |
Pacific [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | 1,635,000,000 |  | 1,669,000,000 |
South Atlantic [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | 1,193,000,000 |  | 1,174,000,000 |
West North Central [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | 29,000,000 |  | 29,000,000 |
West South Central [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | 338,000,000 |  | 318,000,000 |
Region Others [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 1,255,000,000 |  | $ 1,269,000,000 |
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 | 5.20% |  | 5.10% |
Mortgages [Member] | East South Central [Member] [Domain] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 0.30% |  | 0.20% |
Mortgages [Member] | Middle Atlantic [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 7.40% |  | 6.80% |
Mortgages [Member] | Mountain [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 0.60% |  | 0.60% |
Mortgages [Member] | New England [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 7.10% |  | 7.90% |
Mortgages [Member] | Pacific [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 29.20% |  | 29.70% |
Mortgages [Member] | South Atlantic [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 21.30% |  | 20.90% |
Mortgages [Member] | West North Central [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 0.50% |  | 0.50% |
Mortgages [Member] | West South Central [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 6.00% |  | 5.70% |
Mortgages [Member] | Region Others [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 22.40% |  | 22.60% |
agriculture loans [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 16,000,000 |  | $ 26,000,000 |
agriculture loans [Member] | Mortgages [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 0.30% |  | 0.50% |
Industrial Property [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 1,444,000,000 |  | $ 1,422,000,000 |
Industrial Property [Member] | Mortgages [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 25.70% |  | 25.30% |
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 | 0.40% |  | 0.50% |
Multifamily [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 1,386,000,000 |  | $ 1,345,000,000 |
Multifamily [Member] | Mortgages [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 24.70% |  | 23.90% |
Office Building [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 1,451,000,000 |  | $ 1,547,000,000 |
Office Building [Member] | Mortgages [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 25.90% |  | 27.50% |
Retail Site [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 1,050,000,000 |  | $ 1,109,000,000 |
Retail Site [Member] | Mortgages [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 18.70% |  | 19.70% |
Other Property [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 239,000,000 |  | $ 149,000,000 |
Other Property [Member] | Mortgages [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 4.30% |  | 2.60% |
Commercial Loan [Member] |  |  |  |
Servicing Asset [Abstract] |  |  |  |
Servicing Asset at Amortized Cost, Fair Value | $ 571,000,000 |  | $ 359,000,000 |
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding | 186,000,000 |  | 129,000,000 |
Investments [Member] | Commercial Loan [Member] |  |  |  |
Servicing Asset [Abstract] |  |  |  |
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding | 385,000,000 |  | 230,000,000 |
Separate Accounts [Member] | Commercial Loan [Member] |  |  |  |
Servicing Asset [Abstract] |  |  |  |
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding | $ 104,000,000 |  | $ 54,000,000 |

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