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Leases - Supplemental balance sheet information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Mar. 31, 2018
Operating leases:        
Operating lease right-of-use assets (included in Other assets) $ 199 $ 214    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating lease right-of-use assets (included in Other assets)      
Current operating lease liabilities (included in Other current liabilities) $ 61      
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Current operating lease liabilities (included in Other current liabilities)      
Noncurrent operating lease liabilities (included in Other long-term liabilities) $ 138      
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Noncurrent operating lease liabilities (included in Other long-term liabilities)      
Total operating lease liabilities $ 199 $ 214    
Finance leases:        
Property, plant and equipment, net 3,074   $ 3,085 $ 3,190
Current finance lease liabilities (included in Long-term debt due within one year) $ 6      
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Current finance lease liabilities (included in Long-term debt due within one year)      
Noncurrent finance lease liabilities (included in Long-term debt) $ 37      
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Noncurrent finance lease liabilities (included in Long-term debt)      
Total finance lease liabilities $ 43      
Weighted-average remaining lease term (in years):        
Operating leases weighted-average remaining lease term (in years) 5 years 1 month 6 days      
Finance leases weighted-average remaining lease term (in years) 7 years 2 months 12 days      
Weighted-average discount rate:        
Operating leases (as a percent) 3.90%      
Finance leases (as a percent) 5.20%      
Property, plant and equipment finance leases        
Finance leases:        
Property, plant and equipment $ 74      
Accumulated amortization (27)      
Property, plant and equipment, net $ 47