Other Expense

The components of other expense are as follows:



	Three Months Ended March 31,
	2019		2018
	(in millions)
Transportation commitment charges (a)	$	40	$	34
Asset impairment (b) (Note 4)	32		—
Restructuring charges (Note 3)	13		—
Accelerated depreciation (c)	23		—
Vertical integration services loss, net (d)	20		6
Other	10		13
Legal and environmental charges	5		4
Idle drilling and well service equipment charges (e)	4		—
	$	147	$	57

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(a)	Primarily represents firm transportation payments on excess pipeline capacity commitments.


(b)	Represents inventory and other property and equipment impairment charges of $16 million related to the decommissioning of the Company's Brady, Texas sand mine and $15 million of impairment charges related to inventory and other property and equipment excluded from the Company's sale of its pumping services assets in December 2018.


(c)	Represents accelerated depreciation related to the decommissioning of the Company's Brady, Texas sand mine.

(d)

For the three months ended March 31, 2019, amount includes $9 million of decommissioning operating expenses related to the Company's Brady sand mine and $15 million of carryover and winding down operating expenses related to the Company's sale of its pumping services assets in December 2018, partially offset by net margins (attributable to third party working interest owners) that result from Company-provided well service operations, which are ancillary to and supportive of the Company's oil and gas joint operating activities, and do not represent intercompany transactions. For the three months ended March 31, 2019, these vertical integration net margins included $35 million of revenues and $55 million of costs and expenses. For the same period in 2018, these vertical integration net margins included $34 million of revenues and $40 million of costs and expenses.


(e)	Primarily represents expenses attributable to idle frac fleet and drilling rig fees that are not chargeable to joint operations.