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Supplemental financial information - Accrued expenses and other liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accrued expenses and other liabilities [Abstract]
Severance and related expenses	$ 158	$ 217
Customer incentive programs and allowances	143	213
Property and other non-income taxes	108	127
Other	242	324
Total	$ 651	$ 881

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. 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

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).

+ References+ Details