Contingencies and Commitments (Tables)

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Gathering, processing and transportation commitments

The aggregate undiscounted commitments under our gathering, processing and transportation agreements, excluding any reimbursement from working interest and royalty interest owners, credits for third-party volumes or future costs under cost-of-service agreements, are presented below:

	March 31, 2018
	($ in millions)
2018	$	815
2019	1,052
2020	980
2021	884
2022	772
2023 – 2035	4,406
Total	$	8,909