Leases and Other Commitments (Tables)

12 Months Ended

Dec. 31, 2011

Leases [Abstract]

Operating leases and capital leases [Table Text Block]

		Operating		Capital
(millions)		leases		leases
2012	$	150	$	1
2013		123		1
2014		93		1
2015		69		1
2016		59		-
2017 and beyond		95		1
Total minimum payments	$	589	$	5
Amount representing interest				(1)
Obligations under capital leases				4
Obligations due within one year				(1)
Long-term obligations under capital leases			$	3