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	$ 2,439
Amount recognized for:
Insurance reserves	(178)
DAC and DSI	(161)
Amounts recognized	(339)
Deferred income taxes	(444)
Increase in unrealized net capital gains and losses, after-tax	1,656
Fixed income securities
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Change in unrealized net capital gains and losses	2,440
Derivatives
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	$ (1)