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Leases - Future Lease Payments Under Non-cancelable Leases (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
ASC 842 Operating Leases    
2019 $ 159  
2020 179  
2021 125  
2022 88  
2023 65  
Thereafter 118  
Total future undiscounted lease payments 734  
Less imputed interest (85)  
Total operating lease liabilities 649  
ASC 842 Finance Leases    
2019 16  
2020 21  
2021 14  
2022 5  
2023 2  
Thereafter 0  
Total future undiscounted lease payments 58  
Less imputed interest (3)  
Total finance lease liabilities $ 55  
ASC 840 Operating Leases    
2019   $ 208
2020   165
2021   114
2022   79
2023   57
Thereafter   157
Total future undiscounted lease payments   $ 780