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Leases - Future Lease Payments Under Non-cancelable Leases (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
ASC 842 Operating Leases    
2019 (excluding the six months ended June 30, 2019) $ 113  
2020 193  
2021 137  
2022 96  
2023 63  
Thereafter 120  
Total future undiscounted lease payments 722  
Less imputed interest (78)  
Total operating lease liabilities 644  
ASC 842 Finance Leases    
2019 (excluding the six months ended June 30, 2019) 13  
2020 23  
2021 18  
2022 7  
2023 2  
Thereafter 1  
Total future undiscounted lease payments 64  
Less imputed interest (3)  
Total finance lease liabilities $ 61  
ASC 840 Operating Leases    
2019   $ 208
2020   165
2021   114
2022   79
2023   57
Thereafter   157
Total future undiscounted lease payments   $ 780