Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Accounts Payable and Accrued Liabilities [Abstract]
Trade accounts payable and accruals	$ 520	$ 1,084
Advances from customers	1,352	1,576
Other accruals	1,061	1,088
Total accounts payable and accrued liabilities	$ 2,933	$ 3,748