Fair Value of Financial Instruments - Changes to Fair Value of Financial Instruments Level 3 (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Dec. 01, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	$ 21,421		$ 21,421
Assets, Fair Value Disclosure	2,357		2,357
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	1,961		1,785
Assets, Total Gains (Losses) Included in Earnings	1		2
Assets, Total Gains (Losses) Included in AOCI	(14)		(46)
Assets, Purchases	590		1,212
Assets, Sales	(12)		(12)
Assets, Settlements	(23)		(144)
Assets, Net transfer In (Out) of Level 3	(146)		(440)
Balance at End of Period	2,357		2,357
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	3,081		3,028
Liabilities, Total Gains (Losses) Included in Earnings	204		229
Liabilities, Total Gains (Losses) Included in AOCI	0		0
Liabilities, Purchases	0		0
Liabilities, Sales	0		0
Liabilities, Settlements	(28)		0
Liabilities, Net transfer In (Out) of Level 3	0		0
Balance at End of Period	3,257		3,257
Liabilities, fair value	3,257		3,257
FIA embedded derivatives, included in contractholder funds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	2,320		2,277
Liabilities, Total Gains (Losses) Included in Earnings	231		274
Liabilities, Total Gains (Losses) Included in AOCI	0		0
Liabilities, Purchases	0		0
Liabilities, Sales	0		0
Liabilities, Settlements	0		0
Liabilities, Net transfer In (Out) of Level 3	0		0
Balance at End of Period	2,551		2,551
Future Policy Benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	737		728
Liabilities, Total Gains (Losses) Included in Earnings	(25)		(44)
Liabilities, Total Gains (Losses) Included in AOCI	0		0
Liabilities, Purchases	0		0
Liabilities, Sales	0		0
Liabilities, Settlements	(28)		0
Liabilities, Net transfer In (Out) of Level 3	0		0
Balance at End of Period	684		684
Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	3,682		3,682
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	330		412
Assets, Total Gains (Losses) Included in Earnings	0		0
Assets, Total Gains (Losses) Included in AOCI	0		(2)
Assets, Purchases	162		342
Assets, Sales	0		0
Assets, Settlements	(11)		(18)
Assets, Net transfer In (Out) of Level 3	(77)		(330)
Balance at End of Period	404		404
Commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	1,794		1,794
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	60		49
Assets, Total Gains (Losses) Included in Earnings	0		0
Assets, Total Gains (Losses) Included in AOCI	(1)		(3)
Assets, Purchases	0		12
Assets, Sales	0		0
Assets, Settlements	0		(6)
Assets, Net transfer In (Out) of Level 3	(12)		(5)
Balance at End of Period	47		47
Corporates
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	11,634		11,634
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	1,190		1,169
Assets, Total Gains (Losses) Included in Earnings	0		0
Assets, Total Gains (Losses) Included in AOCI	(9)		(36)
Assets, Purchases	53		252
Assets, Sales	0		0
Assets, Settlements	(5)		(108)
Assets, Net transfer In (Out) of Level 3	(21)		(69)
Balance at End of Period	1,208		1,208
Hybrids
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	951		951
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	10		10
Assets, Total Gains (Losses) Included in Earnings	0		0
Assets, Total Gains (Losses) Included in AOCI	(1)		(1)
Assets, Purchases	0		0
Assets, Sales	0		0
Assets, Settlements	0		0
Assets, Net transfer In (Out) of Level 3	0		0
Balance at End of Period	9		9
Foreign Government Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	160		160
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	16		17
Assets, Total Gains (Losses) Included in Earnings	0		0
Assets, Total Gains (Losses) Included in AOCI	0		(1)
Assets, Purchases	0		0
Assets, Sales	0		0
Assets, Settlements	0		0
Assets, Net transfer In (Out) of Level 3	0		0
Balance at End of Period	16		16
Municipals
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	37		38
Assets, Total Gains (Losses) Included in Earnings	0		0
Assets, Total Gains (Losses) Included in AOCI	(1)		(2)
Assets, Purchases	0		0
Assets, Sales	0		0
Assets, Settlements	0		0
Assets, Net transfer In (Out) of Level 3	0		0
Balance at End of Period	36		36
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	3		3
Assets, Total Gains (Losses) Included in Earnings	1		2
Assets, Total Gains (Losses) Included in AOCI	0		(1)
Assets, Purchases	0		0
Assets, Sales	0		0
Assets, Settlements	0		0
Assets, Net transfer In (Out) of Level 3	0		0
Balance at End of Period	4		4
Available-for-sale embedded derivative
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	17		17
Assets, Total Gains (Losses) Included in Earnings	0		0
Assets, Total Gains (Losses) Included in AOCI	0		0
Assets, Purchases	0		0
Assets, Sales	0		0
Assets, Settlements	0		0
Assets, Net transfer In (Out) of Level 3	0		0
Balance at End of Period	17		17
Residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	1,680		1,680
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	242		66
Assets, Total Gains (Losses) Included in Earnings	0		0
Assets, Total Gains (Losses) Included in AOCI	(2)		0
Assets, Purchases	375		554
Assets, Sales	1		1
Assets, Settlements	3		8
Assets, Net transfer In (Out) of Level 3	(36)		(36)
Balance at End of Period	575		575
Reinsurance Receivables, Funds Withheld [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	6		4
Assets, Total Gains (Losses) Included in Earnings	0		0
Assets, Total Gains (Losses) Included in AOCI	0		0
Assets, Purchases	0		2
Assets, Sales	0		0
Assets, Settlements	(4)		(4)
Assets, Net transfer In (Out) of Level 3	0		0
Balance at End of Period	2		2
Market Approach | Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	396		396
Market Approach | Commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	8		8
Market Approach | Corporates
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	684		684
Market Approach | Foreign Government Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	16		16
Market Approach | Municipals
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	36		36
Market Approach | Residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	242		242
Third Parties [Member] | Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	8		8
Matrix Pricing Valuation [Member] | Commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure						$ 39
Matrix Pricing Valuation [Member] | Corporates
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	524		524
Matrix Pricing Valuation [Member] | Hybrids
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	9		9
Matrix Pricing Valuation [Member] | Residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	333		333
Matrix Pricing Valuation [Member] | Reinsurance Receivables, Funds Withheld [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	2		2
Black Scholes Model [Member] | Other invested assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	17		17
Yield Method Valuation Technique [Member] | Other invested assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	39		39
Affiliated Entity | HGI Energy Note [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	50		0
Assets, Total Gains (Losses) Included in Earnings	0		0
Assets, Total Gains (Losses) Included in AOCI	0		0
Assets, Purchases	0		50
Assets, Sales	(11)		(11)
Assets, Settlements	0		0
Assets, Net transfer In (Out) of Level 3	0		0
Balance at End of Period	39		39
Affiliated Entity | Income Approach Valuation Technique | Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	4		4
Fixed indexed annuities | Income Approach Valuation Technique
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, fair value	2,551		2,551
Preferred shares reimbursement feature embedded derivative | Income Approach Valuation Technique
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, fair value	22		22
Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	24,943		24,943
Fair Value | Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	3,682		3,682
Fair Value | Commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	1,794		1,794
Fair Value | Corporates
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	11,634		11,634
Fair Value | Hybrids
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	951		951
Fair Value | Foreign Government Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	160		160			197
Fair Value | Municipals
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	1,381		1,381
Fair Value | Other invested assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	56		56
Fair Value | Residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	1,680		1,680
Fair Value | Reinsurance Receivables, Funds Withheld [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	680		680			740
Fair Value | Fixed indexed annuities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	3,257		3,257
Fair Value | Preferred shares reimbursement feature embedded derivative
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	22		22		$ 24	23	$ 23
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, Total Gains (Losses) Included in Earnings	(2)		(1)
Liabilities, Total Gains (Losses) Included in AOCI	0		0
Liabilities, Purchases	0		0
Liabilities, Sales	0		0
Liabilities, Settlements	0		0
Liabilities, Net transfer In (Out) of Level 3	0		0
Predecessor
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities						20,963
Assets, Fair Value Disclosure						1,785
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		$ 1,440		$ 1,427
Assets, Total Gains (Losses) Included in Earnings		1		0
Assets, Total Gains (Losses) Included in AOCI		3		24
Assets, Purchases		105		236
Assets, Sales		(15)		(15)
Assets, Settlements		(38)		(101)
Assets, Net transfer In (Out) of Level 3		(47)		(122)
Balance at End of Period		1,449		1,449
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		2,442		2,250
Liabilities, Total Gains (Losses) Included in Earnings		0		377
Liabilities, Total Gains (Losses) Included in AOCI		0		0
Liabilities, Purchases		0		0
Liabilities, Sales		0		0
Liabilities, Settlements		0		0
Liabilities, Net transfer In (Out) of Level 3		0		0
Balance at End of Period		2,627		2,627
Liabilities, fair value						3,028
Predecessor | FIA embedded derivatives, included in contractholder funds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		2,442		2,250
Liabilities, Total Gains (Losses) Included in Earnings		185		377
Liabilities, Total Gains (Losses) Included in AOCI		0		0
Liabilities, Purchases		0		0
Liabilities, Sales		0		0
Liabilities, Settlements		0		0
Liabilities, Net transfer In (Out) of Level 3		0		0
Balance at End of Period		2,627		2,627
Predecessor | Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities						3,065
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		204		197
Assets, Total Gains (Losses) Included in Earnings		0		(1)
Assets, Total Gains (Losses) Included in AOCI		1		4
Assets, Purchases		22		88
Assets, Sales		0		0
Assets, Settlements		(16)		(33)
Assets, Net transfer In (Out) of Level 3		(52)		(96)
Balance at End of Period		159		159
Predecessor | Commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities						956
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		84		85
Assets, Total Gains (Losses) Included in Earnings		0		0
Assets, Total Gains (Losses) Included in AOCI		1		3
Assets, Purchases		10		10
Assets, Sales		0		0
Assets, Settlements		0		(1)
Assets, Net transfer In (Out) of Level 3		0		(2)
Balance at End of Period		95		95
Predecessor | Corporates
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities						12,570
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		1,056		1,062
Assets, Total Gains (Losses) Included in Earnings		0		0
Assets, Total Gains (Losses) Included in AOCI		0		11
Assets, Purchases		73		138
Assets, Sales		(15)		(15)
Assets, Settlements		(22)		(61)
Assets, Net transfer In (Out) of Level 3		5		(38)
Balance at End of Period		1,097		1,097
Predecessor | Hybrids
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities						1,067
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		10		10
Assets, Total Gains (Losses) Included in Earnings		0		0
Assets, Total Gains (Losses) Included in AOCI		0		0
Assets, Purchases		0		0
Assets, Sales		0		0
Assets, Settlements		0		0
Assets, Net transfer In (Out) of Level 3		0		0
Balance at End of Period		10		10
Predecessor | Foreign Government Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities						197
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		17		16
Assets, Total Gains (Losses) Included in Earnings		0		0
Assets, Total Gains (Losses) Included in AOCI		0		1
Assets, Purchases		0		0
Assets, Sales		0		0
Assets, Settlements		0		0
Assets, Net transfer In (Out) of Level 3		0		0
Balance at End of Period		17		17
Predecessor | Municipals
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		38		37
Assets, Total Gains (Losses) Included in Earnings		0		0
Assets, Total Gains (Losses) Included in AOCI		0		1
Assets, Purchases		0		0
Assets, Sales		0		0
Assets, Settlements		0		0
Assets, Net transfer In (Out) of Level 3		0		0
Balance at End of Period		38		38
Predecessor | Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		1		1
Assets, Total Gains (Losses) Included in Earnings		0		0
Assets, Total Gains (Losses) Included in AOCI		1		1
Assets, Purchases		0		0
Assets, Sales		0		0
Assets, Settlements		0		0
Assets, Net transfer In (Out) of Level 3		0		0
Balance at End of Period		2		2
Predecessor | Available-for-sale embedded derivative
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		15		13
Assets, Total Gains (Losses) Included in Earnings		1		2
Assets, Total Gains (Losses) Included in AOCI		0		1
Assets, Purchases		0		0
Assets, Sales		0		0
Assets, Settlements		0		0
Assets, Net transfer In (Out) of Level 3		0		0
Balance at End of Period		16		16
Predecessor | Loan participations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		0		6
Assets, Total Gains (Losses) Included in Earnings		0		(1)
Assets, Total Gains (Losses) Included in AOCI		0		1
Assets, Purchases		0		0
Assets, Sales		0		0
Assets, Settlements		0		(6)
Assets, Net transfer In (Out) of Level 3		0		0
Balance at End of Period		0		0
Predecessor | Residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities						1,277
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		15		0
Assets, Total Gains (Losses) Included in Earnings		0		0
Assets, Total Gains (Losses) Included in AOCI		0		1
Assets, Purchases		0		0
Assets, Sales		0		0
Assets, Settlements		0		0
Assets, Net transfer In (Out) of Level 3		0		14
Balance at End of Period		$ 15		$ 15
Predecessor | Market Approach | Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure						412
Predecessor | Market Approach | Commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure						49
Predecessor | Market Approach | Corporates
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure						763
Predecessor | Market Approach | Foreign Government Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure						17
Predecessor | Market Approach | Municipals
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure						38
Predecessor | Income Approach Valuation Technique | Corporates
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure						406
Predecessor | Income Approach Valuation Technique | Hybrids
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure						10
Predecessor | Affiliated Entity | Market Approach | Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure						3
Predecessor | Affiliated Entity | Market Approach | Other invested assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure						17
Predecessor | Fixed indexed annuities | Income Approach Valuation Technique
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, fair value						2,277
Predecessor | Preferred shares reimbursement feature embedded derivative | Income Approach Valuation Technique
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, fair value						23
Predecessor | Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure						24,796
Predecessor | Fair Value | Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities						3,065
Predecessor | Fair Value | Commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities						956
Predecessor | Fair Value | Corporates
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities						12,570
Predecessor | Fair Value | Hybrids
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities						1,067
Predecessor | Fair Value | Municipals
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities						1,747
Predecessor | Fair Value | Residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities						$ 1,277
FSRC [Member] | Income Approach Valuation Technique | Future Policy Benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, fair value	$ 684		$ 684