Lease Commitments (Tables)

12 Months Ended

Dec. 31, 2011

Lease Commitments

Rental expenses for operating leases

Years ended December 31	2011		2010		2009
Rental expense	$	525	$	429	$	346
Sub lease rental income		71		57		52
Net rental expense	$	454	$	372	$	294

Future minimum rental payments under operating leases for continuing operations that have initial or remaining noncancelable lease terms in excess of one year, net of sublease rental income

At December 31, 2011, future minimum rental payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year, net of sublease rental income, are as follows (in millions):

2012	$	395
2013		373
2014		334
2015		296
2016		257
Thereafter		984
Total minimum payments required	$	2,639