Contingencies and Commitments (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Future Minimum Rental Payments for Operating Leases

The aggregate undiscounted minimum future lease payments are presented below.



	December 31, 2012
	Rigs		Compressors		Other		Total
	($ in millions)
2013	$	93	$	71	$	17	$	181
2014	82		125		13		220
2015	37		51		11		99
2016	68		105		9		182
2017	21		23		3		47
After 2017	6		30		3		39
Total	$	307	$	405	$	56	$	768

Schedule Of Aggregate Undiscounted Commitments On Gathering, Processing And Transportation Agreements

The aggregate undiscounted commitments under our gathering, processing and transportation agreements, excluding any reimbursement from working interest and royalty interest owners, are presented below.



	December 31, 2012
	($ in millions)
2013	$	1,540
2014	1,988
2015	1,801
2016	1,895
2017	1,922
2018 - 2099	9,344
Total	$	18,490

Schedule Of Future Payments For Drilling Contracts Table Text Block

As of December 31, 2012, the aggregate undiscounted minimum future payments under these drilling rig commitments are presented below:



	December 31, 2012
	($ in millions)
2013	$	123
2014	68
2015	11
Total	$	202