Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies

Minimum lease payments under capital and operating leases with non-cancelable terms in excess of one year

Minimum lease payments under capital and operating leases with non-cancelable terms in excess of one year as of December 31, 2017, were as follows:

			Operating
(Millions)	Capital Leases		Leases
2018	$	12	$	258
2019		10		212
2020		9		160
2021		6		106
2022		5		88
After 2022		34		274
Total	$	76	$	1,098
Less: Amounts representing interest		3
Present value of future minimum lease payments		73
Less: Current obligations under capital leases		13
Long-term obligations under capital leases	$	60