Common Stock	9 Months Ended
Sep. 30, 2017
Equity [Abstract]
Common Stock	8. Common Stock During the nine months ended September 30, 2017, a total of 42,260,915 Class B shares were converted to Class A shares, primarily in connection with two public follow-on offerings that included sales by holders of Class B shares, at which time the shares automatically converted to Class A common shares. In connection with each follow-on offering, AP Alternative Assets, L.P. distributed Class B shares to its unitholders and certain of such unitholders participated in the applicable follow-on offering. To the extent that such shares were distributed to unitholders other than a member of the Apollo Group (as defined by our bye-laws), such shares automatically converted to Class A shares. We did not sell any shares in the offerings. Stock-based Compensation—Stock-based compensation expense was $11 million and $47 million for the three months ended September 30, 2017 and 2016, respectively, and $40 million and $61 million for the nine months ended September 30, 2017 and 2016, respectively. As of September 30, 2017, the stock-based compensation plans had unrecognized compensation expense of $39 million. The cost is expected to be recognized over a weighted-average period of 1.2 years. Employee Stock Purchase Plan – Eligible employees may participate in our 2017 Employee Stock Purchase Plan (ESPP), which provides the opportunity to purchase our Class A shares at a discount from the market price through payroll deductions. Pursuant to the ESPP, employees are permitted to purchase shares at a price equal to 85% of the fair value of such shares as determined by reference to the closing price of our Class A shares on the New York Stock Exchange on the last day of the relevant purchase period. Under the ESPP we may make available for sale up to 3,800,000 Class A shares over the term of the ESPP, which may extend for up to 10 years. As of September 30, 2017, we had not sold any shares under the ESPP.

8. Common Stock

During the nine months ended September 30, 2017, a total of 42,260,915 Class B shares were converted to Class A shares, primarily in connection with two public follow-on offerings that included sales by holders of Class B shares, at which time the shares automatically converted to Class A common shares. In connection with each follow-on offering, AP Alternative Assets, L.P. distributed Class B shares to its unitholders and certain of such unitholders participated in the applicable follow-on offering. To the extent that such shares were distributed to unitholders other than a member of the Apollo Group (as defined by our bye-laws), such shares automatically converted to Class A shares. We did not sell any shares in the offerings.

Stock-based Compensation—Stock-based compensation expense was $11 million and $47 million for the three months ended September 30, 2017 and 2016, respectively, and $40 million and $61 million for the nine months ended September 30, 2017 and 2016, respectively. As of September 30, 2017, the stock-based compensation plans had unrecognized compensation expense of $39 million. The cost is expected to be recognized over a weighted-average period of 1.2 years.

Employee Stock Purchase Plan – Eligible employees may participate in our 2017 Employee Stock Purchase Plan (ESPP), which provides the opportunity to purchase our Class A shares at a discount from the market price through payroll deductions. Pursuant to the ESPP, employees are permitted to purchase shares at a price equal to 85% of the fair value of such shares as determined by reference to the closing price of our Class A shares on the New York Stock Exchange on the last day of the relevant purchase period. Under the ESPP we may make available for sale up to 3,800,000 Class A shares over the term of the ESPP, which may extend for up to 10 years. As of September 30, 2017, we had not sold any shares under the ESPP.