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STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (UA) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Net loss $ (124) $ (194)
Other comprehensive income (loss), net of tax:    
Employee benefit plans (17) (35)
Investments and other (2) 21
Total other comprehensive loss, net of tax (19) (14)
Total comprehensive loss, net (143) (208)
United Airlines, Inc.    
Net loss (124) (194)
Other comprehensive income (loss), net of tax:    
Employee benefit plans (17) (35)
Investments and other (2) 21
Total other comprehensive loss, net of tax (19) (14)
Total comprehensive loss, net $ (143) $ (208)