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Contracts with Customers	6 Months Ended
Contracts with Customers	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Contracts with Customers	CONTRACTS WITH CUSTOMERS Our current and noncurrent Loyalty Program liability increased by $226 million, to $5,687 million at June 30, 2019, from $5,461 million at December 31, 2018, primarily reflecting an increase in points earned, partially offset by deferred revenue of $997 million that we recognized in the 2019 first half. At each reporting period, we evaluate the estimates used in the recognition of Loyalty Program revenues, including estimates of the breakage of points that members will never redeem and the amount of funding we expect to receive over the life of the agreements with various third parties. In the 2019 second quarter, the updated estimates resulted in an increase in deferred revenue, and a corresponding reduction of revenue of approximately $147 million ($111 million net of tax).