Leases Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Schedule of Lease Assets and Liabilities [Line Items]
Operating Lease, Right-of-Use Asset	[1]	$ 555
Current operating lease liabilities	[2]	140
Noncurrent operating lease liabilities	[3]	426
Total operating lease liabilities		566
Finance Lease, Right-of-Use Asset, Gross		15
Finance Lease, Right-Of-Use Asset, Accumulated Depreciation		(8)
Finance Lease, Liability, Current		4	$ 25
Finance Lease, Liability, Noncurrent		5	$ 67
Finance Lease, Liability		9
Property, Plant and Equipment [Member]
Schedule of Lease Assets and Liabilities [Line Items]
Finance Lease, Right-of-Use Asset		7
Short-term borrowings and finance lease obligations
Schedule of Lease Assets and Liabilities [Line Items]
Finance Lease, Liability, Current		4
Long-term Debt [Member]
Schedule of Lease Assets and Liabilities [Line Items]
Finance Lease, Liability, Noncurrent		$ 5

[1] Included in other assets in the Consolidated Balance Sheet.

[2] Included in accrued and other current liabilities in the Consolidated Balance Sheet.

[3] Included in other noncurrent obligations in the Consolidated Balance Sheet.