Basis of Presentation - Adoption on Consolidated Condensed 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 income	$ 388	$ 187	$ 792	$ 539
Adjustments to reconcile net income to net cash provided by operating activities, net			300	497
Changes in: Insurance reserves			$ 1,165	1,417
As Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income		202		572
Adjustments to reconcile net income to net cash provided by operating activities, net				505
Changes in: Insurance reserves				1,376
Effect of Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income		$ (15)		(33)
Adjustments to reconcile net income to net cash provided by operating activities, net				(8)
Changes in: Insurance reserves				$ 41