Acquisitions and Sale of Businesses - Impact of exited lines on earnings (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net investment income			$ 717	$ 730	$ 461
Net earnings, including noncontrolling interests			898	1,995	721
Realized gains on subsidiaries			0	4	23
Income tax expense (benefit)			(225)	(254)	(25)
Less: Net loss attributable to noncontrolling interests			$ 0	$ 0	11
Neon Capital Limited
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Underwriting loss					(135)
Net investment income					(5)
Other income and expenses, net					(5)
Net earnings, including noncontrolling interests					(145)
Realized gains on subsidiaries	$ 4	$ 23			23
Total pretax loss from Neon exited lines					(122)
Income tax expense (benefit)					72
Less: Net loss attributable to noncontrolling interests					(11)
Net loss from Neon exited lines attributable to shareholders					$ (39)