Investments - Unrealized net capital gains and losses included in AOCI (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Fair value
Fixed income securities, at fair value	$ 41,282	$ 42,136
Short-term investments	4,384	4,009
Derivative instruments	0	0
Gross unrealized Gains
Fixed income securities	43	1,002
Short-term investments	0	0
Derivative instruments	0	0
Gross unrealized Losses
Fixed income securities	(2,788)	(242)
Short-term investments	0	0
Derivative instruments	(3)	(3)
Unrealized net gains (losses)
Fixed income securities	(2,745)	760
Short-term investments	0	0
Derivative instruments	(3)	(3)
Equity method of accounting limited partnerships	7	(1)
Unrealized net capital gains and losses, pre-tax	(2,741)	756
Amounts recognized for:
Other unrealized net capital gains and losses, pre-tax	25	5
Deferred income taxes	578	(163)
Unrealized net capital gains and losses, after-tax	$ (2,138)	$ 598