Basis of Presentation - Adoption on Consolidated Condensed Statements of Cash Flows (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 Income (loss)	$ 276	$ (27)	$ 1,068	$ 512
Adjustments to reconcile net income to net cash provided by operating activities, net			519	726
Changes in: Insurance reserves			$ 1,184	1,999
As Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income (loss)		143		715
Adjustments to reconcile net income to net cash provided by operating activities, net				779
Changes in: Insurance reserves				1,743
Effect of Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income (loss)		$ (170)		(203)
Adjustments to reconcile net income to net cash provided by operating activities, net				(53)
Changes in: Insurance reserves				$ 256