Other Financial Information (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid expenses	$ 410	$ 295
Income tax receivable	17	22
Materials, supplies and inventory	128	96
Contract assets	45	45
Note receivable	56	56
Receivable for sale of land	49	56
Other	11	11
Total other current assets	962	829
Other current assets, held for sale	123	126
Acquisition Costs
Prepaid Expenses and Other Current Assets [Abstract]
Contract costs	139	142
Fulfillment Costs
Prepaid Expenses and Other Current Assets [Abstract]
Contract costs	$ 107	$ 106