Contingencies and Commitments (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of operating leases

The aggregate undiscounted minimum future lease payments are presented below:

	December 31, 2018
	($ in millions)
2019	$	3
2020	1
Total	$	4

Schedule of undiscounted 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:

	December 31, 2018
	($ in millions)
2019	$	832
2020	774
2021	683
2022	581
2023	470
2024 – 2034	2,431
Total	$	5,771

The aggregate undiscounted minimum future payments under this service contract is detailed below.

	December 31, 2018
	($ in millions)
2019	$	5
2020	5
2021	5
Total	$	15