Other Financial Information (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid expenses	$ 392	$ 319
Income tax receivable	122	0
Materials, supplies and inventory	227	236
Contract assets	20	20
Other	15	5
Total other current assets	982	803
Other current assets, held for sale	55	59
Acquisition Costs
Prepaid Expenses and Other Current Assets [Abstract]
Contract costs	107	123
Fulfillment Costs
Prepaid Expenses and Other Current Assets [Abstract]
Contract costs	$ 99	$ 100