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Leases - Maturity Analysis of Undiscounted Cash Out Flows (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Finance leases      
2020 $ 62    
2021 59    
2022 48    
2023 31    
2024 12    
Thereafter 46    
Imputed Interest (54)    
Finance lease obligations 204 $ 200 $ 41
Operating leases      
2020 1,486    
2021 1,198    
2022 928    
2023 673    
2024 514    
Thereafter 806    
Imputed Interest (346)    
Operating lease liabilities 5,259 $ 5,100  
Amount of leases not yet commenced $ 181