Investments (Other Invested Assets) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Document Period End Date	Jun. 30, 2021
Other invested assets	$ 2,924	$ 2,829
Equity Release Mortgages [Member]
Other invested assets	958	935
Limited Partner [Member]
Other invested assets	1,611	1,367
Derivatives
Other invested assets	146	140
Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Other invested assets	54	289
Other
Other invested assets	$ 155	$ 98