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Accounts Payable and Accrued Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts Payable and Accrued Liabilities [Abstract]    
Trade accounts payable and accruals $ 1,084us-gaap_AccountsPayableTradeCurrent $ 1,184us-gaap_AccountsPayableTradeCurrent
Advances from customers 1,576us-gaap_CustomerAdvancesCurrent 1,676us-gaap_CustomerAdvancesCurrent
Other accruals 1,088us-gaap_OtherAccruedLiabilitiesCurrent 1,023us-gaap_OtherAccruedLiabilitiesCurrent
Total accounts payable and accrued liabilities $ 3,748us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 3,883us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent