Deferred Policy Acquisition Costs Level 4 (Details) - USD ($) $ in Millions	5 Months Ended	7 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Costs	$ 405	$ 421	$ 463	$ 542
Deferred Policy Acquisition Costs, Additions	1	0	2	7
Deferred Policy Acquisition Cost, Amortization Expense, Other	(13)	0	(51)	(40)
Deferred Policy Acquisition Cost, Amortization Expense, Assumption Change	(3)	0	3	(74)
Deferred Policy Acquisition Cost, Unrealized Investment Gain (Loss)	31	0	(12)	28
Deferred Policy Acquisition Costs	421	0	405	463
Movement in Present Value of Future Insurance Profits [Roll Forward]
Present Value of Future Insurance Profits, Net	0	0	0	0
Present Value of Future Insurance Profits, Amortization Expense	0	(80)	0	0
Present Value of Future Insurance Profits, Amortization Expense, Assumption Change	0	(19)	0	0
Present Value of Future Insurance Profits, Unrealized Gain (Loss) on Investment	0	10	0	0
Present Value of Future Insurance Profits, Net	$ 0	716	$ 0	$ 0
Present Value of Future Insurance Profits, Amortization Expense, Next Five Years [Abstract]
Present Value of Future Insurance Profits, Amortization Expense, Year One		23
Present Value of Future Insurance Profits, Amortization Expense, Year Two		35
Present Value of Future Insurance Profits, Amortization Expense, Year Three		47
Present Value of Future Insurance Profits, Amortization Expense, Year Four		43
Present Value of Future Insurance Profits, Amortization Expense, Year Five		$ 41