Investments - Unrealized net capital gains and losses included in AOCI (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair value
Fixed income securities	$ 66,354	$ 59,044
Short-term investments	7,800	4,260
Derivative instruments	0	0
Gross unrealized Gains
Fixed income securities	4,976	2,847
Short-term investments	0	0
Derivative instruments	0	0
Gross unrealized Losses
Fixed income securities	(73)	(96)
Short-term investments	0	0
Derivative instruments	(3)	(3)
Unrealized net gains (losses)
Fixed income securities	4,903	2,751
Short-term investments	0	0
Derivative instruments	(3)	(3)
EMA limited partnerships	(4)	(4)
Unrealized net capital gains and losses, pre-tax	4,896	2,744
Amounts recognized for:
Insurance reserves	(496)	(126)
DAC and DSI	(364)	(224)
Amounts recognized	(860)	(350)
Deferred income taxes	(856)	(507)
Total unrealized net capital gains and losses	$ 3,180	$ 1,887