Other Financial Information (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid expenses	$ 481	$ 395
Income tax receivable	11	273
Materials, supplies and inventory	193	209
Contract assets	18	19
Assets held for sale	104	104
Other	18	14
Total other current assets	1,033	1,223
Acquisition Costs
Prepaid Expenses and Other Current Assets [Abstract]
Contract costs	106	107
Fulfillment Costs
Prepaid Expenses and Other Current Assets [Abstract]
Contract costs	$ 102	$ 102