Other Financial Information- Other Current Assets (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid expenses	$ 57	$ 50
Contract acquisition costs	40	43
Contract fulfillment costs	31	31
Receivable for sale of land	0	56
Other	6	7
Total other current assets	$ 134	$ 187