General - Schedule of Condensed Consolidated Statements of Cash Flows (unaudited) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss	$ (4)	$ (674)	$ (1,700)	$ (1,046)
Changes in:
Policy benefits and other insurance reserves			3,068	3,464
Unearned premiums			2,216	2,255
Deferred policy acquisition costs			(385)	(567)
Reinsurance recoverables, net			534	99
Income taxes			(532)	(555)
Other operating assets and liabilities			(82)	(381)
Net cash provided by operating activities			$ 3,003	4,151
As reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss		(683)		(1,061)
Changes in:
Policy benefits and other insurance reserves				3,520
Unearned premiums				2,256
Deferred policy acquisition costs				(562)
Reinsurance recoverables, net				56
Income taxes				(559)
Other operating assets and liabilities				(381)
Net cash provided by operating activities				4,151
Impact of change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss		$ 9		15
Changes in:
Policy benefits and other insurance reserves				(56)
Unearned premiums				(1)
Deferred policy acquisition costs				(5)
Reinsurance recoverables, net				43
Income taxes				4
Other operating assets and liabilities				0
Net cash provided by operating activities				$ 0