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Leases - Lease Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Operating Leases, under ASC 842    
2019 $ 45  
2020 79  
2021 70  
2022 58  
2023 47  
Thereafter 140  
Total lease payments 439  
Less: Interest (38)  
Present value of lease liabilities 401  
Finance Leases, under ASC 842    
2019 2  
2020 7  
2021 7  
2022 1  
2023 1  
Thereafter 1  
Total lease payments 19  
Less: Interest (1)  
Present value of lease liabilities 18  
Operating lease payments related to options to extend lease terms that are reasonably certain of being exercised 61  
Minimum lease payments for leases signed but not yet commenced $ 13  
Operating Leases, under ASC 840    
2019   $ 94
2020   75
2021   62
2022   51
2023   40
Thereafter   108
Total   $ 430
Minimum    
Lessee, Lease, Description [Line Items]    
Leases not yet commenced, term 1 year  
Equipment | Maximum    
Lessee, Lease, Description [Line Items]    
Leases not yet commenced, term 7 years