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Fair Value Measurements (excluding Consolidated Investment Entities) - Fair Value Measurement (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value $ 40,938.0 $ 39,663.0
Derivatives 809.0 316.0
Assets held in separate accounts 78,521.0 81,670.0
Total assets 166,934.0 169,051.0
Derivatives 950.0 403.0
Total liabilities 156,645.0 158,821.0
Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 45,158.0 43,778.0
U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,544.0 1,382.0
U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 103.0 95.0
State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,368.0 1,323.0
U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 15,042.0 14,938.0
U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 6,219.0 6,035.0
Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 4,360.0 4,341.0
Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 4,653.0 4,831.0
Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 5,946.0 5,204.0
Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 3,847.0 3,574.0
Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 2,076.0 2,055.0
Measured at fair value on a recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 45,158.0 43,778.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 2,842.0 2,644.0
Assets held in separate accounts 78,521.0 81,670.0
Total assets $ 127,555.0 $ 128,604.0
Percentage of Level to total 100.00% 100.00%
Total liabilities $ 1,292.0 $ 563.0
Measured at fair value on a recurring basis | Guaranteed benefit derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 210.0 60.0
Measured at fair value on a recurring basis | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 734.0 294.0
Derivatives 940.0 371.0
Measured at fair value on a recurring basis | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 67.0 12.0
Derivatives 2.0 22.0
Measured at fair value on a recurring basis | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 8.0 10.0
Derivatives 6.0 8.0
Measured at fair value on a recurring basis | Embedded derivative on reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 132.0 100.0
Measured at fair value on a recurring basis | Credit contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 2.0 2.0
Measured at fair value on a recurring basis | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,544.0 1,382.0
Measured at fair value on a recurring basis | U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 103.0 95.0
Measured at fair value on a recurring basis | State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,368.0 1,323.0
Measured at fair value on a recurring basis | U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 15,042.0 14,938.0
Measured at fair value on a recurring basis | U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 6,219.0 6,035.0
Measured at fair value on a recurring basis | Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 4,360.0 4,341.0
Measured at fair value on a recurring basis | Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 4,653.0 4,831.0
Measured at fair value on a recurring basis | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 5,946.0 5,204.0
Measured at fair value on a recurring basis | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 3,847.0 3,574.0
Measured at fair value on a recurring basis | Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 2,076.0 2,055.0
Measured at fair value on a recurring basis | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 225.0 196.0
Measured at fair value on a recurring basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,195.0 1,083.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 2,805.0 2,613.0
Assets held in separate accounts 71,561.0 75,405.0
Total assets $ 75,633.0 $ 79,171.0
Percentage of Level to total 59.00% 61.00%
Total liabilities $ 1.0 $ 0.0
Measured at fair value on a recurring basis | Level 1 | Guaranteed benefit derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 8.0 2.0
Derivatives 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Derivatives 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Derivatives 1.0 0.0
Measured at fair value on a recurring basis | Level 1 | Embedded derivative on reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | Credit contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,195.0 1,083.0
Measured at fair value on a recurring basis | Level 1 | U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 1 | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 64.0 68.0
Measured at fair value on a recurring basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 42,024.0 40,735.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 37.0 31.0
Assets held in separate accounts 6,786.0 6,149.0
Total assets $ 49,601.0 $ 47,180.0
Percentage of Level to total 39.00% 37.00%
Total liabilities $ 1,034.0 $ 454.0
Measured at fair value on a recurring basis | Level 2 | Guaranteed benefit derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 0.0 0.0
Measured at fair value on a recurring basis | Level 2 | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 679.0 243.0
Derivatives 893.0 322.0
Measured at fair value on a recurring basis | Level 2 | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 67.0 12.0
Derivatives 2.0 22.0
Measured at fair value on a recurring basis | Level 2 | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 8.0 10.0
Derivatives 5.0 8.0
Measured at fair value on a recurring basis | Level 2 | Embedded derivative on reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 132.0 100.0
Measured at fair value on a recurring basis | Level 2 | Credit contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 2.0 2.0
Measured at fair value on a recurring basis | Level 2 | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 349.0 299.0
Measured at fair value on a recurring basis | Level 2 | U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 103.0 95.0
Measured at fair value on a recurring basis | Level 2 | State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,368.0 1,323.0
Measured at fair value on a recurring basis | Level 2 | U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 14,935.0 14,864.0
Measured at fair value on a recurring basis | Level 2 | U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 4,829.0 4,578.0
Measured at fair value on a recurring basis | Level 2 | Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 4,360.0 4,341.0
Measured at fair value on a recurring basis | Level 2 | Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 4,348.0 4,503.0
Measured at fair value on a recurring basis | Level 2 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 5,908.0 5,181.0
Measured at fair value on a recurring basis | Level 2 | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 3,847.0 3,574.0
Measured at fair value on a recurring basis | Level 2 | Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,977.0 1,977.0
Measured at fair value on a recurring basis | Level 2 | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 0.0 0.0
Measured at fair value on a recurring basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,939.0 1,960.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 0.0 0.0
Assets held in separate accounts 174.0 116.0
Total assets $ 2,321.0 $ 2,253.0
Percentage of Level to total 2.00% 2.00%
Total liabilities $ 257.0 $ 109.0
Measured at fair value on a recurring basis | Level 3 | Guaranteed benefit derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 210.0 60.0
Measured at fair value on a recurring basis | Level 3 | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 47.0 49.0
Derivatives 47.0 49.0
Measured at fair value on a recurring basis | Level 3 | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Derivatives 0.0 0.0
Measured at fair value on a recurring basis | Level 3 | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Derivatives 0.0 0.0
Measured at fair value on a recurring basis | Level 3 | Embedded derivative on reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Measured at fair value on a recurring basis | Level 3 | Credit contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Measured at fair value on a recurring basis | Level 3 | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 3 | U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 3 | State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 3 | U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 107.0 74.0
Measured at fair value on a recurring basis | Level 3 | U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,390.0 1,457.0
Measured at fair value on a recurring basis | Level 3 | Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 3 | Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 305.0 328.0
Measured at fair value on a recurring basis | Level 3 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 38.0 23.0
Measured at fair value on a recurring basis | Level 3 | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Measured at fair value on a recurring basis | Level 3 | Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 99.0 78.0
Measured at fair value on a recurring basis | Level 3 | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 161.0 128.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 13,102.0 12,470.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 424.0 533.0
Assets held in separate accounts 1,395.0 1,485.0
Total assets $ 15,183.0 $ 14,827.0
Percentage of Level to total 100.00% 100.00%
Total liabilities $ 348.0 $ 369.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | IUL    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 177.0 217.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 47.0 49.0
Derivatives 51.0 56.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 4.0 1.0
Derivatives   1.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 207.0 254.0
Derivatives 18.0 20.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Embedded derivative on reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 102.0 75.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Credit contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0  
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 914.0 786.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 176.0 161.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 447.0 439.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 6,244.0 5,981.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 998.0 912.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,502.0 1,497.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 591.0 518.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 577.0 588.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,066.0 995.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 587.0 593.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 4.0 35.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 531.0 472.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 424.0 533.0
Assets held in separate accounts 1,395.0 1,485.0
Total assets $ 2,352.0 $ 2,492.0
Percentage of Level to total 16.00% 17.00%
Total liabilities $ 0.0 $ 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | IUL    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Derivatives 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Derivatives   0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Derivatives 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | Embedded derivative on reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | Credit contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0  
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 531.0 472.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 1 | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 2.0 2.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 12,144.0 11,557.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 0.0 0.0
Assets held in separate accounts 0.0 0.0
Total assets $ 12,189.0 $ 11,610.0
Percentage of Level to total 80.00% 78.00%
Total liabilities $ 125.0 $ 103.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | IUL    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 1.0 0.0
Derivatives 5.0 7.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 4.0 1.0
Derivatives   1.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 40.0 52.0
Derivatives 18.0 20.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | Embedded derivative on reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 102.0 75.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | Credit contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0  
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 383.0 314.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 176.0 161.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 447.0 439.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 6,213.0 5,949.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 694.0 596.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,499.0 1,490.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 510.0 438.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 577.0 588.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 1,066.0 995.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 579.0 587.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 2 | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 427.0 441.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 0.0 0.0
Assets held in separate accounts 0.0 0.0
Total assets $ 642.0 $ 725.0
Percentage of Level to total 4.00% 5.00%
Total liabilities $ 223.0 $ 266.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | IUL    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 177.0 217.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 46.0 49.0
Derivatives 46.0 49.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Derivatives   0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 167.0 202.0
Derivatives 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | Embedded derivative on reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | Credit contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0.0  
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 31.0 32.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 304.0 316.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 3.0 7.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 81.0 80.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 0.0 0.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 8.0 6.0
Discontinued Operations, Held-for-sale | Measured at fair value on a recurring basis | Level 3 | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities $ 2.0 $ 33.0