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Related Party Transactions - (Receivables and Payables) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Related Party Transaction    
Contract assets $ 109 $ 108
Accounts payable and accrued liabilities 934 1,241
Other long-term liabilities 378 403
Affiliated entity | Banco Bradesco    
Related Party Transaction    
Trade receivables 40 47
Contract assets 8 5
Accounts payable and accrued liabilities 9 10
Other long-term liabilities $ 14 $ 17