Stockholders' equity (Tables)

3 Months Ended

Mar. 31, 2013

Equity [Abstract]

Summary of activity under our stock repurchase program

Activity under our stock repurchase program was as follows (in millions):

	2013			2012
	Shares	Dollars		Shares	Dollars
First quarter	9.1	$	771	21.0	$	1,429

Components of Accumulated Other Comprehensive Income

The components of AOCI were as follows (in millions):

	Foreign currency translation			Cash flow hedges			Available-for-sale securities			Other			AOCI
Balance as of December 31, 2012	$	12		$	(35	)	$	183		$	(14	)	$	146
Foreign currency translation adjustments	(36		)	—			—			—			(36		)
Unrealized (losses) gains	—			(25		)	(32		)	1			(56		)
Reclassification adjustments to income	—			144			(67		)	—			77
Income taxes	13			(44		)	37			—			6
Balance as of March 31, 2013	$	(11	)	$	40		$	121		$	(13	)	$	137

Reclassifications out of Accumulated Other Comprehensive Income

The reclassifications out of AOCI to Net income were as follows (in millions):

	Amount reclassified out of AOCI
	Three months ended			Line item affected in the
Components of AOCI	March 31, 2013			Statement of Income
Cash flow hedges:
Foreign currency contract losses	$	(4	)	Product sales
Cross-currency swap contract losses	(140		)	Interest and other income, net
	(144		)	Total before income tax
	53			Income tax (expense)/benefit
	$	(91	)	Net of income taxes
Available-for-sale securities:
Net realized gains	$	67		Interest and other income, net
	(25		)	Income tax (expense)/benefit
	$	42		Net of income taxes