Closed Block (Revenues and Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues
Premiums	$ 359	$ 396	$ 1,097	$ 1,153
Net investment income	420	428	1,198	1,303
Net investment gains (losses)	1	3	(8)	(2)
Net derivative gains (losses)	(16)	11	7	23
Total revenues	764	838	2,294	2,477
Expenses
Policyholder benefits and claims	575	564	1,714	1,666
Policyholder dividends	136	229	572	688
Other expenses	27	27	79	84
Total expenses	738	820	2,365	2,438
Revenues, net of expenses before provision for income tax expense (benefit)	26	18	(71)	39
Provision for income tax expense (benefit)	5	3	(15)	7
Revenues, net of expenses and provision for income tax expense (benefit)	$ 21	$ 15	$ (56)	$ 32