Revenue from Contract with Customer (Disaggregation) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenues
Revenue from contracts with customers		$ 146	$ 143
Revenue from other sources	[1]	823	801
Total revenues		969	944
Receivables related to revenues from contracts with customers		49		$ 55
Policy and contract charges [Member]
Revenues
Revenue from contracts with customers		44	45
Policy and contract charges [Member] | Affiliated [Member]
Revenues
Revenue from contracts with customers		41	41
Policy and contract charges [Member] | Unaffiliated [Member]
Revenues
Revenue from contracts with customers		3	4
Other revenues: Administrative Fees [Member]
Revenues
Revenue from contracts with customers		15	14
Other revenues: Administrative Fees [Member] | Affiliated [Member]
Revenues
Revenue from contracts with customers		11	10
Other revenues: Administrative Fees [Member] | Unaffiliated [Member]
Revenues
Revenue from contracts with customers		4	4
Other revenues: Other fees [Member]
Revenues
Revenue from contracts with customers		87	84
Other revenues: Other fees [Member] | Affiliated [Member]
Revenues
Revenue from contracts with customers		86	83
Other revenues: Other fees [Member] | Unaffiliated [Member]
Revenues
Revenue from contracts with customers		1	1
Total [Member]
Revenues
Revenue from contracts with customers		$ 102	$ 98

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