Lessee - Operating Lease ROU Asset, Net and Operating Lease Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease, Other long-term assets	$ 323	$ 319
Operating lease, Accrued expenses and other current liabilities	86	87
Operating lease, Other long-term liabilities	264	260
Total Operating lease liabilities	$ 350	$ 347
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedAndOtherLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent