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Fair Value Measurements (excluding Consolidated Investment Entities) - Fair Value Measurement (Details) - USD ($)
$ in Millions
Mar. 31, 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 $ 37,584.0 $ 39,663.0
Derivatives 875.0 316.0
Assets held in separate accounts 68,937.0 81,670.0
Total assets 155,732.0 169,051.0
Derivatives 1,068.0 403.0
Total liabilities 147,467.0 158,821.0
Fair value, assets, level 1 to level 2 transfers, amount   0.0
Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, available-for-sale, at fair value 41,994.0 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 1,595.0 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 100.0 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 1,315.0 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 13,956.0 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 5,643.0 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 4,006.0 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 4,416.0 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 5,607.0 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 3,484.0 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 1,872.0 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 41,994.0 43,778.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 3,296.0 2,644.0
Assets held in separate accounts 68,937.0 81,670.0
Total assets $ 115,278.0 $ 128,604.0
Percentage of Level to total 100.00% 100.00%
Total liabilities $ 1,373.0 $ 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 253.0 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 783.0 294.0
Derivatives 1,038.0 371.0
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 88.0 12.0
Derivatives   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 4.0 10.0
Derivatives 28.0 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 52.0 100.0
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 1,595.0 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 100.0 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 1,315.0 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 13,956.0 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 5,643.0 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 4,006.0 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 4,416.0 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 5,607.0 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 3,484.0 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 1,872.0 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 176.0 196.0
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 1,253.0 1,083.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 3,263.0 2,613.0
Assets held in separate accounts 61,851.0 75,405.0
Total assets $ 66,462.0 $ 79,171.0
Percentage of Level to total 58.00% 61.00%
Total liabilities $ 2.0 $ 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 36.0 2.0
Derivatives 2.0 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
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 2.0 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 1,253.0 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 57.0 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 38,986.0 40,735.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 33.0 31.0
Assets held in separate accounts 6,945.0 6,149.0
Total assets $ 46,751.0 $ 47,180.0
Percentage of Level to total 40.00% 37.00%
Total liabilities $ 1,068.0 $ 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 697.0 243.0
Derivatives 986.0 322.0
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 88.0 12.0
Derivatives   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 2.0 10.0
Derivatives 28.0 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 52.0 100.0
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 342.0 299.0
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 100.0 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 1,315.0 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 13,890.0 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 4,352.0 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 4,002.0 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 4,139.0 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 5,577.0 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 3,484.0 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 1,785.0 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 1,755.0 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 141.0 116.0
Total assets $ 2,065.0 $ 2,253.0
Percentage of Level to total 2.00% 2.00%
Total liabilities $ 303.0 $ 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 253.0 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 50.0 49.0
Derivatives 50.0 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
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 66.0 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 1,291.0 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 4.0 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 277.0 328.0
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 30.0 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 87.0 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 119.0 128.0
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 12,052.0 12,470.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 0.0 533.0
Assets held in separate accounts 0.0 1,485.0
Total assets $ 12,232.0 $ 14,827.0
Percentage of Level to total 100.00% 100.00%
Total liabilities $ 198.0 $ 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 82.0 217.0
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 50.0 49.0
Derivatives 55.0 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 5.0 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 93.0 254.0
Derivatives 3.0 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 58.0 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 918.0 786.0
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 173.0 161.0
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 438.0 439.0
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 5,646.0 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 868.0 912.0
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 1,365.0 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 531.0 518.0
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 585.0 588.0
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 983.0 995.0
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 545.0 593.0
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 32.0 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 534.0 472.0
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 0.0 533.0
Assets held in separate accounts 0.0 1,485.0
Total assets $ 536.0 $ 2,492.0
Percentage of Level to total 4.00% 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 534.0 472.0
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 11,118.0 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 $ 11,134.0 $ 11,610.0
Percentage of Level to total 91.00% 78.00%
Total liabilities $ 66.0 $ 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 5.0 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 10.0 52.0
Derivatives 3.0 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 58.0 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 384.0 314.0
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 173.0 161.0
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 438.0 439.0
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 5,612.0 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 580.0 596.0
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 1,362.0 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 463.0 438.0
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 585.0 588.0
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 983.0 995.0
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 538.0 587.0
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 400.0 441.0
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 $ 562.0 $ 725.0
Percentage of Level to total 5.00% 5.00%
Total liabilities $ 132.0 $ 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 82.0 217.0
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 49.0 49.0
Derivatives 50.0 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 83.0 202.0
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 34.0 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 288.0 316.0
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 68.0 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 7.0 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 $ 30.0 $ 33.0