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Fair Value Measurements (excluding Consolidated Investment Entities) - Fair Value Measurement (Details) - USD ($)
$ in Millions
Sep. 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 $ 42,330.0 $ 39,663.0
Derivatives 270.0 316.0
Assets held in separate accounts 82,879.0 81,670.0
Total assets 171,466.0 169,051.0
Derivatives 434.0 403.0
Total liabilities 160,821.0 158,821.0
Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 46,171.0 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 1,541.0 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 1,353.0 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 15,689.0 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 6,199.0 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 4,574.0 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 4,724.0 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 5,695.0 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 4,203.0 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 2,090.0 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 46,171.0 43,778.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 1,786.0 2,644.0
Assets held in separate accounts 82,879.0 81,670.0
Total assets $ 131,477.0 $ 128,604.0
Percentage of Level to total 100.00% 100.00%
Total liabilities $ 754.0 $ 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 177.0 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 226.0 294.0
Derivatives 414.0 371.0
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 30.0 12.0
Derivatives 11.0 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 14.0 10.0
Derivatives 7.0 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 143.0 100.0
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 1,541.0 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 1,353.0 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 15,689.0 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 6,199.0 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 4,574.0 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 4,724.0 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 5,695.0 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 4,203.0 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 2,090.0 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 371.0 196.0
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 1,190.0 1,083.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 1,719.0 2,613.0
Assets held in separate accounts 76,316.0 75,405.0
Total assets $ 79,431.0 $ 79,171.0
Percentage of Level to total 61.00% 61.00%
Total liabilities $ 0.0 $ 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 6.0 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 0.0 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 1,190.0 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 200.0 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 42,574.0 40,735.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 67.0 31.0
Assets held in separate accounts 6,356.0 6,149.0
Total assets $ 49,212.0 $ 47,180.0
Percentage of Level to total 37.00% 37.00%
Total liabilities $ 529.0 $ 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 172.0 243.0
Derivatives 366.0 322.0
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 30.0 12.0
Derivatives 11.0 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 13.0 10.0
Derivatives 7.0 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 143.0 100.0
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 351.0 299.0
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 1,353.0 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 15,571.0 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 4,472.0 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 4,574.0 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 4,276.0 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 5,660.0 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 4,199.0 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 2,015.0 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 2,407.0 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 207.0 116.0
Total assets $ 2,834.0 $ 2,253.0
Percentage of Level to total 2.00% 2.00%
Total liabilities $ 225.0 $ 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 177.0 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 48.0 49.0
Derivatives 48.0 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 1.0 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 118.0 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 1,727.0 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 448.0 328.0
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 35.0 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 4.0 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 75.0 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 171.0 128.0
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 13,555.0 12,470.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 504.0 533.0
Assets held in separate accounts 1,473.0 1,485.0
Total assets $ 15,850.0 $ 14,827.0
Percentage of Level to total 100.00% 100.00%
Total liabilities $ 396.0 $ 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 215.0 217.0
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 49.0 49.0
Derivatives 52.0 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 2.0 1.0
Derivatives 1.0 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 263.0 254.0
Derivatives 33.0 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 95.0 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 1,102.0 786.0
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 453.0 439.0
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 6,418.0 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 1,054.0 912.0
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 1,556.0 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 623.0 518.0
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 540.0 588.0
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 1,046.0 995.0
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 716.0 472.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 504.0 533.0
Assets held in separate accounts 1,473.0 1,485.0
Total assets $ 2,695.0 $ 2,492.0
Percentage of Level to total 17.00% 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 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 716.0 472.0
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 12,319.0 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 $ 12,383.0 $ 11,610.0
Percentage of Level to total 78.00% 78.00%
Total liabilities $ 133.0 $ 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 4.0 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 2.0 1.0
Derivatives 1.0 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 61.0 52.0
Derivatives 33.0 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 95.0 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 386.0 314.0
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 453.0 439.0
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 6,387.0 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 677.0 596.0
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 1,554.0 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 525.0 438.0
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 540.0 588.0
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 1,042.0 995.0
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 520.0 441.0
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 $ 772.0 $ 725.0
Percentage of Level to total 5.00% 5.00%
Total liabilities $ 263.0 $ 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 215.0 217.0
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 48.0 49.0
Derivatives 48.0 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 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 202.0 202.0
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 377.0 316.0
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 2.0 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 98.0 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 4.0 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