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Revenues from Contracts with Customers (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Contract with Customer, Asset and Liability
The following table summarizes the activity of our contract liabilities, which are classified as a component of current and long-term deferred revenues, during the six months ended June 30, 2019:
 
(in millions)
Balance as of December 31, 2018
$
1,060

Cash received in advance and not recognized as revenue(1)
220

Revenue recognized(1)
(135
)
Other(2)
(92
)
Balance as of June 30, 2019
$
1,053

____________
(1) 
Primarily related to Hilton Honors, our guest loyalty program.
(2) 
Primarily the result of changes in estimated transaction prices for our performance obligations related to points issued under Hilton Honors, which had no effect on revenues.
The following table summarizes the activity of our contract liabilities during the year ended December 31, 2018:
 
in millions
Balance as of December 31, 2017
$
1,087

Cash received in advance and not recognized as revenue(1)
377

Revenue recognized(1)
(229
)
Other(2)
(175
)
Balance as of December 31, 2018
$
1,060

____________
(1) 
Primarily related to Hilton Honors.
(2) 
Primarily the result of changes in estimated transaction prices for our performance obligations related to points issued under Hilton Honors, which had no effect on revenues.