Cost of Revenue	6 Months Ended
Jun. 30, 2017
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 $40 million and $44 million for the three months ended June 30, 2017 and 2016, respectively, and $92 million and $104 million for the six months ended June 30, 2017 and 2016, respectively. Included in these corporate office costs is stock-based compensation of $6 million and $12 million for the three months ended June 30, 2017 and 2016, respectively, and $15 million and $26 million for the six months ended June 30, 2017 and 2016, respectively.

Cost of Revenue

6 Months Ended

Jun. 30, 2017

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 $40 million and $44 million for the three months ended June 30, 2017 and 2016, respectively, and $92 million and $104 million for the six months ended June 30, 2017 and 2016, respectively. Included in these corporate office costs is stock-based compensation of $6 million and $12 million for the three months ended June 30, 2017 and 2016, respectively, and $15 million and $26 million for the six months ended June 30, 2017 and 2016, respectively.