Employee benefit plans (Tables)

6 Months Ended

Jun. 30, 2012

Net Periodic Benefit Cost (Credit)

The components of net periodic benefit cost are as follows:

Net periodic benefit cost (credit)	Quarter ended
	June 30, 2012									March 31, 2012									June 30, 2011
(in millions)	Domestic pension benefits			Foreign pension benefits			Health care benefits			Domestic pension benefits			Foreign pension benefits			Health care benefits			Domestic pension benefits			Foreign pension benefits			Health care benefits
Service cost	$	15		$	8		$	1		$	15		$	8		$	1		$	16		$	8		$	1
Interest cost		42			9			3			42			9			3			44			9			3
Expected return on assets		(68	)		(12	)		(2	)		(68	)		(12	)		(2	)		(71	)		(11	)		(2	)
Other		38			3			3			38			3			3			23			4			2
Net periodic benefit cost	$	27		$	8		$	5		$	27		$	8		$	5		$	12		$	10		$	4

Net periodic benefit cost (credit)	Year-to-date
	June 30, 2012									June 30, 2011
(in millions)	Domestic pension benefits			Foreign pension benefits			Health care benefits			Domestic pension benefits			Foreign pension benefits			Health care benefits
Service cost	$	30		$	16		$	2		$	32		$	16		$	2
Interest cost		84			18			6			88			17			6
Expected return on assets		(136	)		(24	)		(4	)		(141	)		(22	)		(4	)
Other		76			6			6			46			8			4
Net periodic benefit cost	$	54		$	16		$	10		$	25		$	19		$	8