Lease Commitments (Tables)

12 Months Ended

Dec. 31, 2012

Leases [Abstract]

Schedule of capitalized leased assets

Details of the capitalized leased assets are as follows:

	At December 31
	2012		2011
Upstream	$	433	$	585
Downstream	316		316
All Other	—		—
Total	749		901
Less: Accumulated amortization	479		568
Net capitalized leased assets	$	270	$	333

Rental expenses incurred for operating leases

Rental expenses incurred for operating leases during 2012, 2011 and 2010 were as follows:

	Year ended December 31
	2012		2011		2010
Minimum rentals	$	973	$	892	$	931
Contingent rentals	7		11		10
Total	980		903		941
Less: Sublease rental income	32		39		41
Net rental expense	$	948	$	864	$	900

Estimated future minimum lease payments (net of noncancelable sublease rentals) under operating and capital leases

At December 31, 2012, the estimated future minimum lease payments (net of noncancelable sublease rentals) under operating and capital leases, which at inception had a noncancelable term of more than one year, were as follows:

	At December 31
	Operating		Capital
	Leases		Leases
Year:  2013	$	727	$	45
2014	657		37
2015	618		23
2016	528		13
2017	401		12
Thereafter	617		59
Total	$	3,548	$	189
Less: Amounts representing interest and executory costs			$	(40	)
Net present values			149
Less: Capital lease obligations included in short-term debt			(50		)
Long-term capital lease obligations			$	99