Revenue from Contract with Customer (Disaggregation) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenues
Revenue from contracts with customers		$ 152	$ 151	$ 445	$ 443
Revenue from other sources	[1]	800	815	2,328	2,422
Total revenues		952	966	2,773	2,865
Receivables related to revenues from contracts with customers		55		55		$ 55
Policy and contract charges [Member]
Revenues
Revenue from contracts with customers		47	47	137	137
Policy and contract charges [Member] | Affiliated [Member]
Revenues
Revenue from contracts with customers		44	43	127	126
Policy and contract charges [Member] | Unaffiliated [Member]
Revenues
Revenue from contracts with customers		3	4	10	11
Other revenues: Administrative Fees [Member]
Revenues
Revenue from contracts with customers		15	16	46	47
Other revenues: Administrative Fees [Member] | Affiliated [Member]
Revenues
Revenue from contracts with customers		12	11	33	32
Other revenues: Administrative Fees [Member] | Unaffiliated [Member]
Revenues
Revenue from contracts with customers		3	5	13	15
Other revenues: Other fees [Member]
Revenues
Revenue from contracts with customers		90	88	262	259
Other revenues: Other fees [Member] | Affiliated [Member]
Revenues
Revenue from contracts with customers		89	87	259	256
Other revenues: Other fees [Member] | Unaffiliated [Member]
Revenues
Revenue from contracts with customers		1	1	3	3
Total [Member]
Revenues
Revenue from contracts with customers		$ 105	$ 104	$ 308	$ 306

[1] Amounts primarily consist of revenue associated with insurance and annuity products or financial instruments.