Supplemental financial information - Prepaid expenses and other current assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Schedule of Prepaid Expenses and Other Current Assets [Line Items]
Prepaid taxes on intercompany inventory profits	$ 589		$ 667
Assets held for sale	80	[1]	0	[1]
Other prepaid expenses and current assets	207		196
Prepaid expenses and other current assets	876		863
Property, plant and equipment, net	3,179		3,399
Assets Held-for-sale [Member]
Schedule of Prepaid Expenses and Other Current Assets [Line Items]
Property, plant and equipment, net			$ 81

[1] As of March 31, 2014, we determined that excess assets in various locations, with an aggregate carrying value of $80 million, met the criteria to be considered held for sale and were reclassified from Property, plant and equipment, net, to Prepaid expenses and other current assets in the Consolidated Balance Sheet. The comparable carrying amount of these assets as of December 31, 2013, within Property, plant and equipment, net, was $81 million. 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 Statement of Income in Other.