Other Financial Data - Schedule of Other Non-current Assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Other Financial Data [Abstract]
Cost to obtain contracts with customers	$ 172	$ 171
Taxes receivable	100	102
Leases	101	100
Investments	51	53
Other	124	144
Total	$ 548	$ 570
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent