Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Minimum commitments

Minimum commitments as of December 31, 2016 consist of the following:

(millions)	Drilling, Equipment, and Purchase Obligations		Transportation and Gathering Obligations		Operating Lease  Obligations		Capital  Lease and Other Obligations(1)		Total
2017	$	255	$	250	$	30	$	77	$	612
2018	96		312		42		79		529
2019	52		314		30		52		448
2020	27		275		28		52		382
2021	9		237		28		38		312
2022 and Thereafter	30		1,566		188		163		1,947
Total	$	469	$	2,954	$	346	$	461	$	4,230

⁽¹⁾ Annual lease payments, net to our interest, exclude regular maintenance and operational costs. See Note 10. Long-Term Debt.