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Investment Holding Level 4 Mortgage Loans on Real Estate (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Valuation Allowance, Loss Contingency for Loans, LTV Ratio | 90.00% |  |  |
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan | 52.00% |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 5,697,000,000 | $ 5,624,000,000 |  |
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan | 62.00% |  |  |
Servicing Asset at Fair Value, Amount | $ 0 | 0 |  |
Secured Debt, Repurchase Agreements | 0 | 0 |  |
Commercial Loan [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate | 5,700,000,000 | 5,600,000,000 |  |
Allowance for Loan and Lease Losses, Real Estate | 19,000,000 | 23,000,000 | $ 18,000,000 | $ 67,000,000
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | 5,697,000,000 | 5,624,000,000 |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | 0 | 7,000,000 | 4,000,000 |
Allowance for Loan and Lease Losses, Write-offs | $ 4,000,000 | $ 2,000,000 | $ 53,000,000 |
Average Debt Service Coverage Ratio | 2.70 | 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 |  |
Mortgages [Member] | Commercial Loan [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans | 15,000,000 | 17,000,000 |  |
Mortgage Loans on Real Estate, Write-down or Reserve, Amount | 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 | $ 20,000,000 | $ 24,000,000 |  |
Average Debt Service Coverage Ratio | 0.59 | 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 | $ 568,000,000 | $ 623,000,000 |  |
Average Debt Service Coverage Ratio | 2.17 | 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 | $ 5,109,000,000 | $ 4,977,000,000 |  |
Average Debt Service Coverage Ratio | 2.78 | 2.75 |  |
East North Central [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 293,000,000 | $ 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 | 534,000,000 | 384,000,000 |  |
Mountain [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | 61,000,000 | 32,000,000 |  |
New England [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | 345,000,000 | 446,000,000 |  |
Pacific [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | 1,609,000,000 | 1,669,000,000 |  |
South Atlantic [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | 1,198,000,000 | 1,174,000,000 |  |
West North Central [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | 40,000,000 | 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 | $ 1,265,000,000 | $ 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 | 5.10% | 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% | 6.80% |  |
Mortgages [Member] | Mountain [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 1.10% | 0.60% |  |
Mortgages [Member] | New England [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 6.10% | 7.90% |  |
Mortgages [Member] | Pacific [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 28.30% | 29.70% |  |
Mortgages [Member] | South Atlantic [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 21.00% | 20.90% |  |
Mortgages [Member] | West North Central [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 0.70% | 0.50% |  |
Mortgages [Member] | West South Central [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 5.90% | 5.70% |  |
Mortgages [Member] | Region Others [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 22.20% | 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 | $ 1,468,000,000 | $ 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 | $ 1,365,000,000 | $ 1,345,000,000 |  |
Multifamily [Member] | Mortgages [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 24.00% | 23.90% |  |
Office Building [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 1,361,000,000 | $ 1,547,000,000 |  |
Office Building [Member] | Mortgages [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 23.90% | 27.50% |  |
Retail Site [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 1,036,000,000 | $ 1,109,000,000 |  |
Retail Site [Member] | Mortgages [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 18.20% | 19.70% |  |
Other Property [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 426,000,000 | $ 149,000,000 |  |
Other Property [Member] | Mortgages [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Investment Owned, Percent of Net Assets | 7.50% | 2.60% |  |
Commercial Loan [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Servicing Asset at Amortized Cost, Fair Value | $ 901,000,000 | $ 0 |  |
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding | 251,000,000 | 0 |  |
Investments [Member] | Commercial Loan [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding | 650,000,000 | 0 |  |
Separate Accounts [Member] | Commercial Loan [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding | $ 124,000,000 | $ 0 |  |

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