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Common Stockholders' Equity and Preferred Securities	12 Months Ended
Common Stockholders' Equity and Preferred Securities	Dec. 31, 2018
Equity [Abstract]
Common Stockholders' Equity and Preferred Securities	COMMON STOCKHOLDERS' EQUITY AND PREFERRED SECURITIES In 2018, UAL repurchased approximately 17.5 million shares of UAL common stock for $1.2 billion. In December 2017, UAL's Board of Directors authorized a $3.0 billion share repurchase program to acquire UAL's common stock. As of December 31, 2018, the Company had approximately $1.8 billion remaining to purchase shares under its share repurchase program. UAL may repurchase shares through the open market, privately negotiated transactions, block trades or accelerated share repurchase transactions from time to time in accordance with applicable securities laws. UAL may repurchase shares of UAL common stock subject to prevailing market conditions, and may discontinue such repurchases at any time. See Part II, Item 5, Market for registrant's common equity, related stockholder matters and issuer purchases of equity securities, of this report for additional information. At December 31, 2018, approximately 10 million shares of UAL's common stock were reserved for future issuance related to the issuance of equity-based awards under the Company's incentive compensation plans. As of December 31, 2018, UAL had two shares of junior preferred stock (par value $0.01 per share) outstanding. In addition, UAL is authorized to issue 250 million shares of preferred stock (without par value) under UAL's amended and restated certificate of incorporation.