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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    
Contract assets $ 108 $ 168
Accounts payable and accrued liabilities 1,241 1,146
Other long-term liabilities 403 386
Banco Bradesco [Member] | Affiliated Entity [Member]    
Related Party Transaction    
Trade receivables 47 42
Contract assets 5 2
Accounts payable and accrued liabilities 10 10
Other long-term liabilities $ 17 $ 22