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Related Party Transactions - (Receivables and Payables) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Related Party Transaction    
Contract assets $ 115 $ 108
Accounts payable and accrued liabilities 1,007 1,241
Other long-term liabilities 375 403
Affiliated entity | Banco Bradesco    
Related Party Transaction    
Trade receivables 9 47
Contract assets 7 5
Assets held for sale 32 0
Accounts payable and accrued liabilities 9 10
Other long-term liabilities $ 15 $ 17