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Leases Schedule of Lease Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Schedule of Lease Assets and Liabilities [Line Items]      
Operating Lease, Right-of-Use Asset [1] $ 553    
Operating Lease, Liability, Current [2] 152    
Operating Lease, Liability, Noncurrent [3] 428    
Operating Lease, Liability 580    
Finance Lease, Right-of-Use Asset, Gross 28    
Finance Lease, Right-Of-Use Asset, Accumulated Depreciation (9)    
Finance Lease, Liability, Current 18 $ 25 $ 6
Finance Lease, Liability 24    
Property, Plant and Equipment [Member]      
Schedule of Lease Assets and Liabilities [Line Items]      
Finance Lease, Right-of-Use Asset 19    
Short-term Debt [Member]      
Schedule of Lease Assets and Liabilities [Line Items]      
Finance Lease, Liability, Current 18    
Long-term Debt [Member]      
Schedule of Lease Assets and Liabilities [Line Items]      
Finance Lease, Liability, Noncurrent $ 6    
[1]
Included in other assets in the interim Condensed Consolidated Balance Sheet.
[2]
Included in accrued and other current liabilities in the interim Condensed Consolidated Balance Sheet.
[3]
Included in other noncurrent obligations in the interim Condensed Consolidated Balance Sheet.