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Related Party Transactions - (Receivables and Payables) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Related Party Transaction    
Contract assets $ 107 $ 108
Accounts payable and accrued liabilities 1,018 1,241
Other long-term liabilities 390 403
Affiliated entity | Banco Bradesco    
Related Party Transaction    
Trade receivables 45 47
Contract assets 6 5
Accounts payable and accrued liabilities 10 10
Other long-term liabilities $ 18 $ 17