Organization and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2017	Jan. 01, 2017	Dec. 31, 2016
Other current assets	$ 86		$ 78
Other noncurrent assets	$ 68		$ 226
Decrease in Retained earnings		$ 179
New Accounting Pronouncement, Early Adoption, Effect [Member]
Other current assets		10
Other noncurrent assets		169
Decrease in Retained earnings		$ 179