Leases (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Supplemental balance sheet information
Balance sheet location for assets	us-gaap:OtherAssetsMember
Operating lease right-of-use assets	$ 291	$ 239
Balance sheet location for current liabilities	us-gaap:OtherCurrentLiabilitiesMember
Current operating lease liabilities	$ 61	58
Balance sheet location for non-current liabilities	us-gaap:OtherLiabilitiesMember
Noncurrent operating lease liabilities	$ 222	$ 181
Finance lease ROU assets, net	$ 7
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Finance Lease, Liability, Current	$ 1
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Short Term Borrowings and Long Term debt, Current
Finance Lease, Liability, Noncurrent	$ 6
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term Debt, Excluding Current Maturities