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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Related Party Transactions [Abstract]      
Revenues from related parties $ 225 $ 281  
Purchases and related costs from related parties 114 $ 92  
Trade accounts receivable and other receivables, net from related parties 233   $ 144
Trade accounts payable to related parties $ 120   $ 121