Other Non-Current Assets (Tables)
|12 Months Ended|
Dec. 31, 2017
|Other Assets, Noncurrent [Abstract]|
|Schedule of Other Non-Current Assets||
As of December 31, 2017 and 2016, other non-current assets, net consisted of the following (in millions):
Tabular disclosure of noncurrent assets.
Reference 1: http://www.xbrl.org/2003/role/presentationRef