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Related Party Transactions (Schedule of Related Party Receivables and Payables) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]    
Accounts payable and accrued liabilities $ 1,241 $ 1,146
Other long-term liabilities 403 386
Banco Bradesco [Member] | Affiliated Entity [Member]    
Related Party Transaction [Line Items]    
Trade receivables 52 45
Accounts payable and accrued liabilities 10 10
Other long-term liabilities $ 17 $ 22