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Related Party Transactions - (Receivables and Payables) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]    
Accounts payable and accrued liabilities $ 1,064 $ 1,146
Other long-term liabilities 407 386
Affiliated entity | Banco Bradesco    
Related Party Transaction [Line Items]    
Trade receivables 53 45
Accounts payable and accrued liabilities 10 10
Other long-term liabilities $ 18 $ 22