Basis of Presentation - Adoption on Consolidated Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income	$ 404	$ 352
Adjustments to reconcile net income to net cash provided by operating activities, net	204	328
Changes in: Insurance reserves	$ 432	512
As Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income		370
Adjustments to reconcile net income to net cash provided by operating activities, net		333
Changes in: Insurance reserves		489
Effect of Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income		(18)
Adjustments to reconcile net income to net cash provided by operating activities, net		(5)
Changes in: Insurance reserves		$ 23