Other Long Term Liabilities Summary (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Other Liabilities [Line Items]
Long-term capital lease obligations	$ 4,212	$ 3,026
Long-term finance lease obligations	1,736	1,198
Construction liabilities	378	467
Tax contingencies	932	510
Long-term deferred tax liabilities	1,084	1,021
Other	1,584	1,188
Total other long-term liabilities	$ 9,926	$ 7,410