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Supplemental financial information - Accrued expenses and other liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Supplemental Financial Information [Abstract]
Customer incentive programs and allowances	$ 101	$ 143
Severance and related expenses	60	158
Other	337us-gaap_OtherAccruedLiabilitiesCurrent	350us-gaap_OtherAccruedLiabilitiesCurrent
Total	$ 498us-gaap_OtherLiabilitiesCurrent	$ 651us-gaap_OtherLiabilitiesCurrent

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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