Leased Assets (Tables)

12 Months Ended

Dec. 31, 2011

Leased Assets [Abstract]

Future minimum rental payments

2012	$	531
2013		672
2014		523
2015		199
2016		121
Remaining years		1,164
Total minimum lease payments		3,210
Less: income from subleases		47
Net minimum lease payments	$	3,163

Rental Expense

	2011		2010		2009
	(Millions of dollars)
Total rental expense	$	348	$	273	$	266
Less: income from subleases		12		13		11
Net rental expense	$	336	$	260	$	255