Other Financial Information (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid expenses	$ 109	$ 106
Contract assets	28	34
Other	9	47
Total other current assets	239	297
Other current assets reclassified as held for sale	81
Fulfillment Costs
Prepaid Expense and Other Assets, Current [Abstract]
Contract costs	48	63
Acquisition Costs
Prepaid Expense and Other Assets, Current [Abstract]
Contract costs	$ 45	$ 47