Investments - Change in Unrealized Net Capital Gains and Losses (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Change in unrealized net capital gains and losses	$ 987
Amount recognized for:
Insurance reserves	(178)
DAC and DSI	(156)
Amounts recognized	(334)
Deferred income taxes	(137)
Increase in unrealized net capital gains and losses, after-tax	516
Fixed income securities
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Change in unrealized net capital gains and losses	988
Limited partnership interests
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Change in unrealized net capital gains and losses	$ (1)