Deferred Policy Acquisition Costs, Value of Business Acquired and Other Policy-Related Intangibles (Negative VOBA) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Liabilities
Balance at January 1,	$ 750	$ 779	$ 827
Amortization of negative VOBA	(45)	(33)	(56)
Effect of foreign currency translation and other	33	4	8
Balance at December 31,	738	750	779
Accumulated amortization	$ 3,308	$ 3,263	$ 3,230