Investments - Unrealized net capital gains and losses included in AOCI (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair value
Fixed income securities, at fair value	$ 40,594	$ 42,565
Short-term investments	6,017	6,807
Derivative instruments	0	0
Gross unrealized Gains
Fixed income securities	1,409	2,563
Short-term investments	0	0
Derivative instruments	0	0
Gross unrealized Losses
Fixed income securities	(252)	(32)
Short-term investments	0	0
Derivative instruments	(3)	(3)
Unrealized net gains (losses)
Fixed income securities	1,157	2,531
Short-term investments	0	0
Derivative instruments	(3)	(3)
EMA limited partnerships	(1)	(1)
Investments classified as held for sale	1,562	2,369
Unrealized net capital gains and losses, pre-tax	2,715	4,896
Amount recognized for:
Insurance reserves	(358)	(496)
DAC and DSI	(228)	(364)
Reclassification of noncontrolling interest	4
Amounts recognized	(582)	(860)
Deferred income taxes	(453)	(856)
Unrealized net capital gains and losses, after-tax	$ 1,680	$ 3,180