Investments - Unrealized net capital gains and losses (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Fair value
Fixed income securities	$ 21,725	$ 21,400
Short-term investments	1,191	810
Derivative instruments	0	0
Gross unrealized Gains
Fixed income securities	1,549	732
Short-term investments	0	0
Derivative instruments	0	0
Gross unrealized Losses
Fixed income securities	(41)	(389)
Short-term investments	0	0
Derivative instruments	0	0
Unrealized net gains (losses)
Fixed income securities	1,508	343
Short-term investments	0	0
Derivative instruments	0	0
EMA limited partnerships	(2)	0
Unrealized net capital gains and losses, pre-tax	1,506	343
Amounts recognized for:
Amounts recognized for:	(126)	0
DAC and DSI	(213)	(35)
Amounts recognized	(339)	(35)
Deferred income taxes	(245)	(65)
Total unrealized net capital gains and losses	$ 922	$ 243