Supplemental financial information - Prepaid expenses and other current assets (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Schedule of Prepaid Expenses and Other Current Assets [Line Items]
Prepaid taxes on intercompany inventory profits	$ 743		$ 667
Assets held for sale	77	[1]	0	[1]
Other prepaid expenses and current assets	144		196
Prepaid expenses and other current assets	964		863
Property, plant and equipment, net	2,930		3,399
Assets held for sale
Schedule of Prepaid Expenses and Other Current Assets [Line Items]
Property, plant and equipment, net			$ 81

[1] As of September 30, 2014, we had excess assets in various locations, with an aggregate carrying value of $77 million, which met the criteria to be considered held for sale and were included in Prepaid expenses and other current assets in our Consolidated Balance Sheets. Prior to the reclassification in the first quarter of 2014, the comparable carrying amount of these assets as of December 31, 2013, of $81 million, was in Property, plant and equipment, net. Assets considered held for sale are no longer being depreciated. We expect the sales transactions applicable to these assets to be completed within the next year and any resulting gain on such sales will be recognized on the Restructuring charges/other line of our Consolidated Statements of Income in Other.