Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Payments

The following summarizes future minimum lease payments under operating leases at December 31, 2017:

millions
2018	$	465
2019	259
2020	94
2021	38
2022	26
Later years	52
Total future minimum lease payments	$	934

Schedule of Gross Aggregate Future Payments of Other Commitments

The following summarizes the gross aggregate future payments under these contracts at December 31, 2017:

millions
2018	$	1,267
2019	1,069
2020	968
2021	756
2022	605
Later years	1,437
Total (1)	$	6,102

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⁽¹⁾  Excludes purchase commitments for jointly owned fields and facilities for which the Company is not the operator.