Related Party Transactions (Effects of Affiliated Reinsurance on Statements of Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Premiums:
Net premiums	$ 226	$ 215	$ 443	$ 435
Universal life and investment-type product policy fees:
Net universal life and investment-type product policy fees	735	797	1,465	1,621
Other revenues:
Other revenues	69	70	131	149
Affiliated Entity
Universal life and investment-type product policy fees:
Net universal life and investment-type product policy fees	55	59	109	120
Affiliated Entity | Assumed
Premiums:
Reinsurance assumed	1	3	1	7
Universal life and investment-type product policy fees:
Reinsurance assumed	2	21	3	47
Other revenues:
Reinsurance assumed	0	0	1	1
Policyholder benefits and claims:
Reinsurance assumed	10	10	17	30
Affiliated Entity | Ceded
Premiums:
Reinsurance ceded	0	(105)	0	(201)
Universal life and investment-type product policy fees:
Reinsurance ceded	0	2	0	1
Other revenues:
Reinsurance ceded	0	6	0	18
Policyholder benefits and claims:
Reinsurance ceded	0	(93)	0	(177)
Affiliated Entity | Reinsurance
Premiums:
Net premiums	1	(102)	1	(194)
Universal life and investment-type product policy fees:
Net universal life and investment-type product policy fees	2	23	3	48
Other revenues:
Other revenues	0	6	1	19
Policyholder benefits and claims:
Net policyholder benefits and claims	$ 10	$ (83)	$ 17	$ (147)