Cost of Revenue	3 Months Ended
Mar. 31, 2018
Cost of Revenue [Abstract]
Cost of Revenue Disclosure	3. COST OF REVENUE Substantially all of the Company’s operating costs and expenses are “cost of revenue” items. Operating costs that could be classified as general and administrative by the Company would include the Company’s corporate office costs at its Franklin, Tennessee office, which were $51 million and $52 million for the three months ended March 31, 2018 and 2017, respectively. Included in these corporate office costs is stock-based compensation of $4 million and $9 million for the three months ended March 31, 2018 and 2017, respectively.

Cost of Revenue

3 Months Ended

Mar. 31, 2018

3. COST OF REVENUE

Substantially all of the Company’s operating costs and expenses are “cost of revenue” items. Operating costs that could be classified as general and administrative by the Company would include the Company’s corporate office costs at its Franklin, Tennessee office, which were $51 million and $52 million for the three months ended March 31, 2018 and 2017, respectively. Included in these corporate office costs is stock-based compensation of $4 million and $9 million for the three months ended March 31, 2018 and 2017, respectively.