Investments - Schedule of Unrealized Net Capital Gains and Losses Included in AOCI (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Fair value
Fixed income securities	$ 46,771	$ 42,485
Short-term investments	3,368	4,173
Derivative instruments	0	0
Gross unrealized Gains
Fixed income securities	29	92
Short-term investments	0	0
Derivative instruments	0	0
Gross unrealized Losses
Fixed income securities	(3,237)	(2,977)
Short-term investments	(1)	(1)
Derivative instruments	(2)	(3)
Unrealized net gains (losses)
Fixed income securities	(3,208)	(2,885)
Short-term investments	(1)	(1)
Derivative instruments	(2)	(3)
Limited partnership interests	(1)	2
Unrealized net capital gains and losses, pre-tax	(3,212)	(2,887)
Amounts recognized for:
Reclassification of noncontrolling interest	21	23
Deferred income taxes	679	609
Unrealized net capital gains and losses, after-tax	$ (2,512)	$ (2,255)