INVESTMENTS - PREDECESSOR COMPANY - Gross Unrealized Losses On Fixed Maturity Securities (Details) $ in Millions	Dec. 31, 2021 USD ($)
Fair Value
Fair Value, Less Than Twelve Months	$ 3,516
Fair Value, Twelve Months or More	285
Fair Value	3,801
Gross   Unrealized  Losses
Gross Unrealized Losses, Less Than Twelve Months	76
Gross Unrealized Losses, Twelve Months or More	10
Gross Unrealized Losses, Total	86
U.S Treasury securities and obligations of U.S. government authorities and agencies
Fair Value
Fair Value, Less Than Twelve Months	74
Fair Value, Twelve Months or More	0
Fair Value	74
Gross   Unrealized  Losses
Gross Unrealized Losses, Less Than Twelve Months	1
Gross Unrealized Losses, Twelve Months or More	0
Gross Unrealized Losses, Total	1
Obligations of U.S. states and their political subdivisions
Fair Value
Fair Value, Less Than Twelve Months	5
Fair Value, Twelve Months or More	0
Fair Value	5
Gross   Unrealized  Losses
Gross Unrealized Losses, Less Than Twelve Months	0
Gross Unrealized Losses, Twelve Months or More	0
Gross Unrealized Losses, Total	0
Foreign government bonds
Fair Value
Fair Value, Less Than Twelve Months	13
Fair Value, Twelve Months or More	7
Fair Value	20
Gross   Unrealized  Losses
Gross Unrealized Losses, Less Than Twelve Months	1
Gross Unrealized Losses, Twelve Months or More	0
Gross Unrealized Losses, Total	1
U.S. corporate public securities
Fair Value
Fair Value, Less Than Twelve Months	696
Fair Value, Twelve Months or More	153
Fair Value	849
Gross   Unrealized  Losses
Gross Unrealized Losses, Less Than Twelve Months	12
Gross Unrealized Losses, Twelve Months or More	6
Gross Unrealized Losses, Total	18
U.S. corporate private securities
Fair Value
Fair Value, Less Than Twelve Months	855
Fair Value, Twelve Months or More	0
Fair Value	855
Gross   Unrealized  Losses
Gross Unrealized Losses, Less Than Twelve Months	14
Gross Unrealized Losses, Twelve Months or More	0
Gross Unrealized Losses, Total	14
Foreign corporate public securities
Fair Value
Fair Value, Less Than Twelve Months	522
Fair Value, Twelve Months or More	50
Fair Value	572
Gross   Unrealized  Losses
Gross Unrealized Losses, Less Than Twelve Months	8
Gross Unrealized Losses, Twelve Months or More	1
Gross Unrealized Losses, Total	9
Foreign corporate private securities
Fair Value
Fair Value, Less Than Twelve Months	689
Fair Value, Twelve Months or More	0
Fair Value	689
Gross   Unrealized  Losses
Gross Unrealized Losses, Less Than Twelve Months	34
Gross Unrealized Losses, Twelve Months or More	0
Gross Unrealized Losses, Total	34
Asset-Backed Securities
Fair Value
Fair Value, Less Than Twelve Months	499
Fair Value, Twelve Months or More	0
Fair Value	499
Gross   Unrealized  Losses
Gross Unrealized Losses, Less Than Twelve Months	1
Gross Unrealized Losses, Twelve Months or More	0
Gross Unrealized Losses, Total	1
Commercial mortgage loans
Fair Value
Fair Value, Less Than Twelve Months	157
Fair Value, Twelve Months or More	75
Fair Value	232
Gross   Unrealized  Losses
Gross Unrealized Losses, Less Than Twelve Months	5
Gross Unrealized Losses, Twelve Months or More	3
Gross Unrealized Losses, Total	8
Residential mortgage-backed securities
Fair Value
Fair Value, Less Than Twelve Months	6
Fair Value, Twelve Months or More	0
Fair Value	6
Gross   Unrealized  Losses
Gross Unrealized Losses, Less Than Twelve Months	0
Gross Unrealized Losses, Twelve Months or More	0
Gross Unrealized Losses, Total	0
Fixed Maturities
Gross   Unrealized  Losses
Gross Unrealized Losses, Twelve Months or More	$ 10