Investments - Change in unrealized net capital gains and losses (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Change in unrealized net capital gains and losses	$ 2,957
Amount recognized for:
Insurance reserves	(202)
DAC and DSI	(188)
Amounts recognized	(390)
Deferred income taxes	(542)
Increase in unrealized net capital gains and losses, after-tax	2,025
Fixed income securities
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Change in unrealized net capital gains and losses	2,960
Derivative instruments
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Change in unrealized net capital gains and losses	0
EMA limited partnerships
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Change in unrealized net capital gains and losses	$ (3)