Supplementary Financial Information - Restricted Cash Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Restricted Cash and Cash Equivalents Items [Line Items]
Total Restricted cash	$ 85	$ 94
Other current assets
Restricted Cash and Cash Equivalents Items [Line Items]
Total Restricted cash	58	55
Other long-term assets
Restricted Cash and Cash Equivalents Items [Line Items]
Total Restricted cash	$ 27	$ 39