Cost of Revenue	6 Months Ended
Jun. 30, 2016
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 $44 million and $47 million for the three months ended June 30, 2016 and 2015, respectively, and $104 million and $124 million for the six months ended June 30, 2016 and 2015, respectively. Included in these corporate office costs is stock-based compensation of $12 million and $15 million for the three months ended June 30, 2016 and 2015, respectively, and $26 million and $30 million for the six months ended June 30, 2016 and 2015, respectively.

Cost of Revenue

6 Months Ended

Jun. 30, 2016

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 $44 million and $47 million for the three months ended June 30, 2016 and 2015, respectively, and $104 million and $124 million for the six months ended June 30, 2016 and 2015, respectively. Included in these corporate office costs is stock-based compensation of $12 million and $15 million for the three months ended June 30, 2016 and 2015, respectively, and $26 million and $30 million for the six months ended June 30, 2016 and 2015, respectively.