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FAIR VALUE OF ASSETS AND LIABILITIES - SUCCESSOR COMPANY - Assets and Liabilities by Hierarchy Level (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fixed Maturity Securities    
Asset-backed securities [1] $ 5,024.0 $ 8,771.0
Equity securities [1] 175.0 322.0
Short-term investments 42.0 875.0
Other invested assets 450.0 106.0
Deposit asset [1] 607.0 2,659.0
Separate account assets [1] 23,601.0 32,267.0
LIABILITIES    
Other liabilities - derivatives 808.0 1,192.0
Separate account liabilities [1] 23,601.0 32,267.0
Retained Business    
Fixed Maturity Securities    
Other invested assets 440.0  
Separate account assets 21,558.0  
LIABILITIES    
Other liabilities - derivatives 459.0  
Separate account liabilities 21,558.0  
Ceded Business    
Fixed Maturity Securities    
Other invested assets 10.0  
Separate account assets 2,043.0  
LIABILITIES    
Other liabilities - derivatives 349.0  
Separate account liabilities 2,043.0  
U.S Treasury securities and obligations of U.S. government authorities and agencies    
Fixed Maturity Securities    
Asset-backed securities   727.0
Obligations of U.S. states and their political subdivisions    
Fixed Maturity Securities    
Asset-backed securities   296.0
U.S. corporate public securities    
Fixed Maturity Securities    
Asset-backed securities   2,461.0
U.S. corporate private securities    
Fixed Maturity Securities    
Asset-backed securities   1,644.0
Foreign corporate public securities    
Fixed Maturity Securities    
Asset-backed securities   795.0
Foreign corporate private securities    
Fixed Maturity Securities    
Asset-backed securities   891.0
Asset-Backed Securities    
Fixed Maturity Securities    
Asset-backed securities   1,062.0
Commercial mortgage-backed securities    
Fixed Maturity Securities    
Asset-backed securities   706.0
Residential mortgage-backed securities    
Fixed Maturity Securities    
Asset-backed securities   75.0
Recurring    
Fixed Maturity Securities    
Asset-backed securities 5,024.0 8,771.0
Equity securities 175.0 322.0
Loans Payable, Fair Value Disclosure 196.0  
Short-term investments 42.0 795.0
Cash and cash equivalents 872.0 1,739.0
Other invested assets 85.0 3.0
Other invested assets, Netting (582.0) (1,475.0)
Deposit asset 607.0  
Reinsurance recoverables 235.0 1,881.0
Net modified coinsurance receivable 18.0  
Subtotal excluding separate account assets 7,254.0 13,938.0
Separate account assets 23,601.0 32,267.0
Total assets 30,855.0 46,205.0
LIABILITIES    
Insurance liabilities 5,546.0  
Other liabilities - derivatives 201.0 0.0
Liabilities, Netting (875.0) (1,153.0)
Separate account liabilities 23,601.0  
Total liabilities 29,348.0 6,316.0
Recurring | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 3,616.0  
Mortgage and other loans 196.0  
Short-term investments 3.0  
Cash and cash equivalents 433.0  
Other invested assets 85.0  
Other invested assets, Netting (347.0)  
Subtotal excluding separate account assets 4,333.0  
Separate account assets 21,558.0  
Total assets 25,891.0  
LIABILITIES    
Insurance liabilities 2,941.0  
Other liabilities - derivatives 0.0  
Liabilities, Netting (602.0)  
Separate account liabilities 21,558.0  
Total liabilities 24,499.0  
Recurring | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 1,408.0  
Equity securities 175.0  
Short-term investments 39.0  
Cash and cash equivalents 439.0  
Other invested assets 0.0  
Other invested assets, Netting (235.0)  
Deposit asset 607.0  
Reinsurance recoverables 235.0  
Net modified coinsurance receivable 18.0  
Subtotal excluding separate account assets 2,921.0  
Separate account assets 2,043.0  
Total assets 4,964.0  
LIABILITIES    
Insurance liabilities 2,605.0  
Other liabilities - derivatives 201.0  
Liabilities, Netting (272.0)  
Separate account liabilities 2,043.0  
Total liabilities 4,849.0  
Recurring | U.S Treasury securities and obligations of U.S. government authorities and agencies    
Fixed Maturity Securities    
Asset-backed securities 696.0 727.0
Recurring | U.S Treasury securities and obligations of U.S. government authorities and agencies | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 582.0  
Recurring | U.S Treasury securities and obligations of U.S. government authorities and agencies | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 114.0  
Recurring | Obligations of U.S. states and their political subdivisions    
Fixed Maturity Securities    
Asset-backed securities 166.0 296.0
Recurring | Obligations of U.S. states and their political subdivisions | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 136.0  
Recurring | Obligations of U.S. states and their political subdivisions | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 30.0  
Recurring | Foreign government bonds    
Fixed Maturity Securities    
Asset-backed securities 5.0 114.0
Recurring | Foreign government bonds | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Foreign government bonds | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 5.0  
Recurring | U.S. corporate public securities    
Fixed Maturity Securities    
Asset-backed securities 2,796.0 2,460.0
Recurring | U.S. corporate public securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 2,018.0  
Recurring | U.S. corporate public securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 778.0  
Recurring | U.S. corporate private securities    
Fixed Maturity Securities    
Asset-backed securities 290.0 1,645.0
Recurring | U.S. corporate private securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 146.0  
Recurring | U.S. corporate private securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 144.0  
Recurring | Foreign corporate public securities    
Fixed Maturity Securities    
Asset-backed securities 211.0 795.0
Recurring | Foreign corporate public securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 122.0  
Recurring | Foreign corporate public securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 89.0  
Recurring | Foreign corporate private securities    
Fixed Maturity Securities    
Asset-backed securities 67.0 892.0
Recurring | Foreign corporate private securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 36.0  
Recurring | Foreign corporate private securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 31.0  
Recurring | Asset-Backed Securities    
Fixed Maturity Securities    
Asset-backed securities 532.0 1,062.0
Recurring | Asset-Backed Securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 513.0  
Recurring | Asset-Backed Securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 19.0  
Recurring | Commercial mortgage-backed securities    
Fixed Maturity Securities    
Asset-backed securities 43.0 706.0
Recurring | Commercial mortgage-backed securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 43.0  
Recurring | Commercial mortgage-backed securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Residential mortgage-backed securities    
Fixed Maturity Securities    
Asset-backed securities 218.0 74.0
Recurring | Residential mortgage-backed securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 20.0  
Recurring | Residential mortgage-backed securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 198.0  
Recurring | Level 1    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Equity securities 175.0 321.0
Loans Payable, Fair Value Disclosure 0.0  
Short-term investments 0.0 519.0
Cash and cash equivalents 872.0 372.0
Other invested assets 46.0 1.0
Deposit asset 0.0  
Reinsurance recoverables 0.0 0.0
Net modified coinsurance receivable 0.0  
Subtotal excluding separate account assets 1,093.0 1,213.0
Separate account assets 0.0 0.0
Total assets 1,093.0 1,213.0
LIABILITIES    
Insurance liabilities 0.0  
Other liabilities - derivatives 0.0 1.0
Separate account liabilities 0.0  
Total liabilities 0.0 1.0
Recurring | Level 1 | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Mortgage and other loans 0.0  
Short-term investments 0.0  
Cash and cash equivalents 433.0  
Other invested assets 46.0  
Subtotal excluding separate account assets 479.0  
Separate account assets 0.0  
Total assets 479.0  
LIABILITIES    
Insurance liabilities 0.0  
Other liabilities - derivatives 0.0  
Separate account liabilities 0.0  
Total liabilities 0.0  
Recurring | Level 1 | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Equity securities 175.0  
Short-term investments 0.0  
Cash and cash equivalents 439.0  
Other invested assets 0.0  
Deposit asset 0.0  
Reinsurance recoverables 0.0  
Net modified coinsurance receivable 0.0  
Subtotal excluding separate account assets 614.0  
Separate account assets 0.0  
Total assets 614.0  
LIABILITIES    
Insurance liabilities 0.0  
Other liabilities - derivatives 0.0  
Separate account liabilities 0.0  
Total liabilities 0.0  
Recurring | Level 1 | U.S Treasury securities and obligations of U.S. government authorities and agencies    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 1 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Obligations of U.S. states and their political subdivisions    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 1 | Obligations of U.S. states and their political subdivisions | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Obligations of U.S. states and their political subdivisions | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Foreign government bonds    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 1 | Foreign government bonds | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Foreign government bonds | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | U.S. corporate public securities    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 1 | U.S. corporate public securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | U.S. corporate public securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | U.S. corporate private securities    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 1 | U.S. corporate private securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | U.S. corporate private securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Foreign corporate public securities    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 1 | Foreign corporate public securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Foreign corporate public securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Foreign corporate private securities    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 1 | Foreign corporate private securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Foreign corporate private securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Asset-Backed Securities    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 1 | Asset-Backed Securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Asset-Backed Securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Commercial mortgage-backed securities    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 1 | Commercial mortgage-backed securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Commercial mortgage-backed securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Residential mortgage-backed securities    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 1 | Residential mortgage-backed securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 1 | Residential mortgage-backed securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 2    
Fixed Maturity Securities    
Asset-backed securities 4,687.0 8,506.0
Equity securities 0.0 0.0
Loans Payable, Fair Value Disclosure 0.0  
Short-term investments 42.0 263.0
Cash and cash equivalents 0.0 1,359.0
Other invested assets 621.0 1,477.0
Deposit asset 0.0  
Reinsurance recoverables 0.0  
Net modified coinsurance receivable 0.0  
Subtotal excluding separate account assets 5,350.0 11,632.0
Separate account assets 23,601.0 32,267.0
Total assets 28,951.0 43,899.0
LIABILITIES    
Insurance liabilities 0.0  
Other liabilities - derivatives 1,076.0 0.0
Separate account liabilities 23,601.0  
Total liabilities 24,677.0 1,367.0
Recurring | Level 2 | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 3,279.0  
Mortgage and other loans 0.0  
Short-term investments 3.0  
Cash and cash equivalents 0.0  
Other invested assets 386.0  
Subtotal excluding separate account assets 3,668.0  
Separate account assets 21,558.0  
Total assets 25,226.0  
LIABILITIES    
Insurance liabilities 0.0  
Other liabilities - derivatives 602.0  
Separate account liabilities 21,558.0  
Total liabilities 22,160.0  
Recurring | Level 2 | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 1,408.0  
Equity securities 0.0  
Short-term investments 39.0  
Cash and cash equivalents 0.0  
Other invested assets 235.0  
Deposit asset 0.0  
Reinsurance recoverables 0.0  
Net modified coinsurance receivable 0.0  
Subtotal excluding separate account assets 1,682.0  
Separate account assets 2,043.0  
Total assets 3,725.0  
LIABILITIES    
Insurance liabilities 0.0  
Other liabilities - derivatives 473.0  
Separate account liabilities 2,043.0  
Total liabilities 2,516.0  
Recurring | Level 2 | U.S Treasury securities and obligations of U.S. government authorities and agencies    
Fixed Maturity Securities    
Asset-backed securities 696.0 727.0
Recurring | Level 2 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 582.0  
Recurring | Level 2 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 114.0  
Recurring | Level 2 | Obligations of U.S. states and their political subdivisions    
Fixed Maturity Securities    
Asset-backed securities 166.0 296.0
Recurring | Level 2 | Obligations of U.S. states and their political subdivisions | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 136.0  
Recurring | Level 2 | Obligations of U.S. states and their political subdivisions | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 30.0  
Recurring | Level 2 | Foreign government bonds    
Fixed Maturity Securities    
Asset-backed securities 5.0 114.0
Recurring | Level 2 | Foreign government bonds | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 2 | Foreign government bonds | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 5.0  
Recurring | Level 2 | U.S. corporate public securities    
Fixed Maturity Securities    
Asset-backed securities 2,796.0 2,460.0
Recurring | Level 2 | U.S. corporate public securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 2,018.0  
Recurring | Level 2 | U.S. corporate public securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 778.0  
Recurring | Level 2 | U.S. corporate private securities    
Fixed Maturity Securities    
Asset-backed securities 144.0 1,556.0
Recurring | Level 2 | U.S. corporate private securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 2 | U.S. corporate private securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 144.0  
Recurring | Level 2 | Foreign corporate public securities    
Fixed Maturity Securities    
Asset-backed securities 211.0 795.0
Recurring | Level 2 | Foreign corporate public securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 122.0  
Recurring | Level 2 | Foreign corporate public securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 89.0  
Recurring | Level 2 | Foreign corporate private securities    
Fixed Maturity Securities    
Asset-backed securities 31.0 791.0
Recurring | Level 2 | Foreign corporate private securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 2 | Foreign corporate private securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 31.0  
Recurring | Level 2 | Asset-Backed Securities    
Fixed Maturity Securities    
Asset-backed securities 377.0 1,039.0
Recurring | Level 2 | Asset-Backed Securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 358.0  
Recurring | Level 2 | Asset-Backed Securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 19.0  
Recurring | Level 2 | Commercial mortgage-backed securities    
Fixed Maturity Securities    
Asset-backed securities 43.0 674.0
Recurring | Level 2 | Commercial mortgage-backed securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 43.0  
Recurring | Level 2 | Commercial mortgage-backed securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 2 | Residential mortgage-backed securities    
Fixed Maturity Securities    
Asset-backed securities 218.0 54.0
Recurring | Level 2 | Residential mortgage-backed securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 20.0  
Recurring | Level 2 | Residential mortgage-backed securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 198.0  
Recurring | Level 3    
Fixed Maturity Securities    
Asset-backed securities 337.0 265.0
Equity securities 0.0 1.0
Loans Payable, Fair Value Disclosure 196.0  
Short-term investments 0.0 13.0
Cash and cash equivalents 0.0 8.0
Other invested assets 0.0 0.0
Deposit asset 607.0  
Reinsurance recoverables 235.0 1,881.0
Net modified coinsurance receivable 18.0  
Subtotal excluding separate account assets 1,393.0 2,568.0
Separate account assets 0.0 0.0
Total assets 1,393.0 2,568.0
LIABILITIES    
Insurance liabilities 5,546.0  
Other liabilities - derivatives 0.0 0.0
Separate account liabilities 0.0  
Total liabilities 5,546.0 6,101.0
Recurring | Level 3 | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 337.0  
Mortgage and other loans 196.0  
Short-term investments 0.0  
Cash and cash equivalents 0.0  
Other invested assets 0.0  
Subtotal excluding separate account assets 533.0  
Separate account assets 0.0  
Total assets 533.0  
LIABILITIES    
Insurance liabilities 2,941.0  
Other liabilities - derivatives 0.0  
Separate account liabilities 0.0  
Total liabilities 2,941.0  
Recurring | Level 3 | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Equity securities 0.0  
Short-term investments 0.0  
Cash and cash equivalents 0.0  
Other invested assets 0.0  
Deposit asset 607.0  
Reinsurance recoverables 235.0  
Net modified coinsurance receivable 18.0  
Subtotal excluding separate account assets 860.0  
Separate account assets 0.0  
Total assets 860.0  
LIABILITIES    
Insurance liabilities 2,605.0  
Other liabilities - derivatives 0.0  
Separate account liabilities 0.0  
Total liabilities 2,605.0  
Recurring | Level 3 | U.S Treasury securities and obligations of U.S. government authorities and agencies    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 3 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | Obligations of U.S. states and their political subdivisions    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 3 | Obligations of U.S. states and their political subdivisions | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | Obligations of U.S. states and their political subdivisions | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | Foreign government bonds    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 3 | Foreign government bonds | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | Foreign government bonds | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | U.S. corporate public securities    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 3 | U.S. corporate public securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | U.S. corporate public securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | U.S. corporate private securities    
Fixed Maturity Securities    
Asset-backed securities 146.0 89.0
Recurring | Level 3 | U.S. corporate private securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 146.0  
Recurring | Level 3 | U.S. corporate private securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | Foreign corporate public securities    
Fixed Maturity Securities    
Asset-backed securities 0.0 0.0
Recurring | Level 3 | Foreign corporate public securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | Foreign corporate public securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | Foreign corporate private securities    
Fixed Maturity Securities    
Asset-backed securities 36.0 101.0
Recurring | Level 3 | Foreign corporate private securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 36.0  
Recurring | Level 3 | Foreign corporate private securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | Asset-Backed Securities    
Fixed Maturity Securities    
Asset-backed securities 155.0 23.0
Recurring | Level 3 | Asset-Backed Securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 155.0  
Recurring | Level 3 | Asset-Backed Securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | Commercial mortgage-backed securities    
Fixed Maturity Securities    
Asset-backed securities 0.0 32.0
Recurring | Level 3 | Commercial mortgage-backed securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | Commercial mortgage-backed securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | Residential mortgage-backed securities    
Fixed Maturity Securities    
Asset-backed securities 0.0 20.0
Recurring | Level 3 | Residential mortgage-backed securities | Retained Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Level 3 | Residential mortgage-backed securities | Ceded Business    
Fixed Maturity Securities    
Asset-backed securities 0.0  
Recurring | Fair Value Measured at Net Asset Value Per Share    
LIABILITIES    
Other invested assets excluded from fair value hierarchy 345.0 10.0
Recurring | Fair Value Measured at Net Asset Value Per Share | Retained Business    
LIABILITIES    
Other invested assets excluded from fair value hierarchy 344.0  
Recurring | Fair Value Measured at Net Asset Value Per Share | Ceded Business    
LIABILITIES    
Other invested assets excluded from fair value hierarchy 1.0  
Policy loans | Recurring    
Fixed Maturity Securities    
Other invested assets, Netting (582.0) (1,475.0)
Subtotal excluding separate account assets 582.0 1,475.0
Policy loans | Recurring | Retained Business    
Fixed Maturity Securities    
Other invested assets, Netting (347.0)  
Subtotal excluding separate account assets 347.0  
Policy loans | Recurring | Ceded Business    
Fixed Maturity Securities    
Other invested assets, Netting (235.0)  
Subtotal excluding separate account assets 235.0  
Other liabilities | Recurring    
LIABILITIES    
Liabilities, Netting (875.0) $ (1.0)
Other liabilities | Recurring | Retained Business    
LIABILITIES    
Liabilities, Netting (602.0)  
Other liabilities | Recurring | Ceded Business    
LIABILITIES    
Liabilities, Netting $ (272.0)  
[1] We have elected the fair value option on these financial statement line items for the Successor Company. See Note 2 for further discussion.