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	$ 1,237
Amounts recognized for:
Insurance reserves	(202)
DAC and DSI	(183)
Amounts recognized	(385)
Deferred income taxes	(179)
Increase in unrealized net capital gains and losses, after-tax	673
Fixed income securities
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Change in unrealized net capital gains and losses	1,238
Limited partnership interests
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Change in unrealized net capital gains and losses	$ (1)