General - Schedule of condensed consolidated statements of cash flows (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss	$ (1,375)	$ (1,022)	$ (1,696)	$ (372)
Changes in:
Policy benefits and other insurance reserves			2,917	1,222
Unearned premiums			1,032	1,201
Deferred policy acquisition costs			(162)	(315)
Reinsurance recoverables, net			468	645
Income taxes			(538)	(288)
Other operating assets and liabilities			(126)	(788)
Net cash provided by operating activities			$ 1,770	2,105
As reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss		(1,024)		(378)
Changes in:
Policy benefits and other insurance reserves				1,223
Unearned premiums				1,202
Deferred policy acquisition costs				(310)
Reinsurance recoverables, net				645
Income taxes				(290)
Other operating assets and liabilities				(787)
Net cash provided by operating activities				2,105
Impact of change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss		$ 2		6
Changes in:
Policy benefits and other insurance reserves				(1)
Unearned premiums				(1)
Deferred policy acquisition costs				(5)
Reinsurance recoverables, net				0
Income taxes				2
Other operating assets and liabilities				(1)
Net cash provided by operating activities				$ 0