Investments - Unrealized net capital gains and losses included in AOCI (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair value
Fixed income securities	$ 45,550	$ 42,485
Short-term investments	5,137	4,173
Derivative instruments	0	0
Gross unrealized Gains
Fixed income securities	103	92
Short-term investments	0	0
Derivative instruments	0	0
Gross unrealized Losses
Fixed income securities	(2,457)	(2,977)
Short-term investments	(1)	(1)
Derivative instruments	(2)	(3)
Unrealized net gains (losses)
Fixed income securities	(2,354)	(2,885)
Short-term investments	(1)	(1)
Derivative instruments	(2)	(3)
Limited partnership interests	0	2
Unrealized net capital gains and losses, pre-tax	(2,357)	(2,887)
Amounts recognized for:
Reclassification of noncontrolling interest	19	23
Deferred income taxes	493	609
Unrealized net capital gains and losses, after-tax	$ (1,845)	$ (2,255)