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Investments and Derivative Instruments Level 4 Mortgage Loans (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | $ 5,624,000,000 | $ 5,556,000,000 | [1] |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan |  | 54.00% |  |  |
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan |  | 62.00% |  |  |
Average Debt Service Coverage Ratio |  | 2.63 |  |  |
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract] |  |  |  |  |
Servicing Asset at Fair Value, Amount |  | $ 0 |  |  |
Commercial Loan [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Mortgage Loans on Real Estate | [2] | 5,647,000,000 | 5,574,000,000 |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | 5,624,000,000 | 5,556,000,000 |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Allowance, as of Jan. 1 |  | 18,000,000 | 67,000,000 |  | $ 68,000,000
Allowance for Loan and Lease Losses, Period Increase (Decrease) |  | 7,000,000 | 4,000,000 |  | 2,000,000
Allowance for Loan and Lease Losses, Write-offs |  | 2,000,000 | 53,000,000 |  | 3,000,000
Allowance, as of Dec. 31 |  | $ 23,000,000 | $ 18,000,000 |  | $ 67,000,000
Average Debt Service Coverage Ratio |  | 2.63 | 2.51 |  |
Mortgage Loans on Commercial, Number of Delinquent Loans |  |  | $ 1 |  |
Allowance for Loan and Lease Losses [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | $ 82,000,000 | 140,000,000 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | 0 | 0 |  |
Mortgage Loans on Real Estate [Member] | Commercial Loan [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Mortgage Loans on Commercial, Number of Delinquent Loans |  | 17 | 7,000,000 |  |
Mortgage Loans on Real Estate, Write-down or Reserve, Amount |  | 20,000,000 | 0 |  |
East North Central [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | 289,000,000 | 211,000,000 | [1] |
East South Central [Member] [Domain] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | 14,000,000 | 0 | [1] |
Middle Atlantic [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | 384,000,000 | 468,000,000 | [1] |
Mountain [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | 32,000,000 | 88,000,000 | [1] |
New England [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | 446,000,000 | 381,000,000 | [1] |
Pacific [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | 1,669,000,000 | 1,607,000,000 | [1] |
South Atlantic [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | 1,174,000,000 | 1,019,000,000 | [1] |
West North Central [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | 29,000,000 | 44,000,000 | [1] |
West South Central [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | 318,000,000 | 302,000,000 | [1] |
Region Others [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | [1] | $ 1,269,000,000 | $ 1,436,000,000 |  |
Mortgage Loans on Real Estate [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 100.00% | 100.00% |  |
Mortgage Loans on Real Estate [Member] | East North Central [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 5.10% | 3.80% |  |
Mortgage Loans on Real Estate [Member] | East South Central [Member] [Domain] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 0.20% | 0.00% |  |
Mortgage Loans on Real Estate [Member] | Middle Atlantic [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 6.80% | 8.40% |  |
Mortgage Loans on Real Estate [Member] | Mountain [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 0.60% | 1.60% |  |
Mortgage Loans on Real Estate [Member] | New England [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 7.90% | 6.90% |  |
Mortgage Loans on Real Estate [Member] | Pacific [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 29.70% | 29.00% |  |
Mortgage Loans on Real Estate [Member] | South Atlantic [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 20.90% | 18.30% |  |
Mortgage Loans on Real Estate [Member] | West North Central [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 0.50% | 0.80% |  |
Mortgage Loans on Real Estate [Member] | West South Central [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 5.70% | 5.40% |  |
Mortgage Loans on Real Estate [Member] | Region Others [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 22.60% | 25.80% |  |
Office Building [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | $ 1,547,000,000 | $ 1,517,000,000 |  |
Office Building [Member] | Mortgage Loans on Real Estate [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 27.50% | 27.30% |  |
Hotel [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | $ 26,000,000 | $ 26,000,000 |  |
Hotel [Member] | Mortgage Loans on Real Estate [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 0.50% | 0.50% |  |
Industrial Property [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | $ 1,422,000,000 | $ 1,476,000,000 |  |
Industrial Property [Member] | Mortgage Loans on Real Estate [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 25.30% | 26.60% |  |
agriculture loans [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | $ 26,000,000 | $ 46,000,000 |  |
agriculture loans [Member] | Mortgage Loans on Real Estate [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 0.50% | 0.80% |  |
Multifamily [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | $ 1,345,000,000 | $ 1,190,000,000 |  |
Multifamily [Member] | Mortgage Loans on Real Estate [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 23.90% | 21.40% |  |
Retail Site [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | $ 1,109,000,000 | $ 1,147,000,000 |  |
Retail Site [Member] | Mortgage Loans on Real Estate [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 19.70% | 20.60% |  |
Other Property [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | $ 149,000,000 | $ 154,000,000 |  |
Other Property [Member] | Mortgage Loans on Real Estate [Member] |  |  |  |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Investment Owned, Percent of Net Assets |  | 2.60% | 2.80% |  |
Commercial Loan [Member] |  |  |  |  |
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract] |  |  |  |  |
Servicing Asset at Amortized Cost, Fair Value |  | $ 359,000,000 |  |  |
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding |  | 129,000,000 |  |  |
Commercial Loan [Member] | Investments [Member] |  |  |  |  |
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract] |  |  |  |  |
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding |  | 230,000,000 |  |  |
Commercial Loan [Member] | Separate Accounts [Member] |  |  |  |  |
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract] |  |  |  |  |
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding |  | 54,000,000 |  |  |
LTV 80 to 100 Percent [Member] | Commercial Loan [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | $ 24,000,000 | $ 53,000,000 |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Average Debt Service Coverage Ratio |  | 0.81 | 1.07 |  |
LTV Between 65 to 80 Percent [Member] | Commercial Loan [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | $ 623,000,000 | $ 789,000,000 |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Average Debt Service Coverage Ratio |  | 1.82 | 1.75 |  |
LTV Less than 65 Percent [Member] | Commercial Loan [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  | $ 4,977,000,000 | $ 4,714,000,000 |  |
Movement in Valuation Allowance for Mortgage Loans [Roll Forward] |  |  |  |  |
Average Debt Service Coverage Ratio |  | 2.75 | 2.66 |  |
[1] | Primarily represents loans collateralized by multiple properties in various regions.
[2] | Amortized cost represents carrying value prior to valuation allowances, if any.

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