Debt (Schedule of Convertible Notes) (Details) - Convertible notes - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Long-Term Debt
Principal	$ 1,150	$ 1,725
Less: Unamortized debt issuance costs	13	24
Carrying value	1,137	1,701
Contractual interest expense	69	76
Amortization of debt issuance costs, discounts and premiums	8	16
Interest expense	$ 77	$ 92