Supplementary Information - Accounts Payable and Accrued Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Payroll, vacation and employee benefits	$ 1,910	$ 1,825
Trade	4,155	3,550
Other	2,772	3,078
Accounts payable and accrued liabilities	$ 8,837	$ 8,453