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OPERATING SEGMENT INFORMATION (Tables) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting [Abstract]        
Schedule of Segment Reporting Information, by Segment     Operating segment information is as follows (in millions):
Three Months Ended September 30, 2022
MainlineRegionalHorizon
Consolidating & Other(a)
Air Group Adjusted(b)
Special Items(c)
Consolidated
Operating Revenues   
Passenger revenues$2,217 $398 $— $— $2,615 $— $2,615 
CPA revenues— — 93 (93)— — — 
Mileage Plan other revenue133 13 — — 146 — 146 
Cargo and other65 — — 2 67 — 67 
Total Operating Revenues2,415 411 93 (91)2,828 — 2,828 
Operating Expenses
Operating expenses, excluding fuel1,352 292 94 (94)1,644 245 1,889 
Fuel expense625 121 — — 746 131 877 
Total Operating Expenses1,977 413 94 (94)2,390 376 2,766 
Non-operating Income (Expense)8 — (5)— 3 — 3 
Income (Loss) Before Income Tax$446 $(2)$(6)$3 $441 $(376)$65 
Pretax Margin15.6 %2.3 %
Three Months Ended September 30, 2021
MainlineRegionalHorizon
Consolidating & Other(a)
Air Group Adjusted(b)
Special Items(c)
Consolidated
Operating Revenues
Passenger revenues$1,425 $349 $— $— $1,774 $— $1,774 
CPA revenues— — 107 (107)— — — 
Mileage Plan other revenue105 15 — — 120 — 120 
Cargo and other58 — — 1 59 — 59 
Total Operating Revenues1,588 364 107 (106)1,953 — 1,953 
Operating Expenses
Operating expenses, excluding fuel1,060 288 93 (113)1,328 (9)1,319 
Fuel expense299 77 — — 376 — 376 
Total Operating Expenses1,359 365 93 (113)1,704 (9)1,695 
Non-operating Income (Expense)(8)— (6)1 (13)— (13)
Income (Loss) Before Income Tax$221 $(1)$8 $8 $236 $9 $245 
Pretax Margin12.1 %12.5 %
  
Nonoperating Income (Expense) $ 3 $ (13) $ (3) $ (46)
Interest income 17 6 35 19
Operating Expenses, Excluding Fuel 1,889 1,319 5,120 2,778
Economic fuel 877 376 2,000 853
Operating Expenses 2,766 1,695 7,120 3,631
Income (Loss) Before Income Tax $ 65 $ 245 $ 44 $ 600
Pretax Margin, GAAP 2.30% 12.50% 0.60% 14.00%
Pretax Margin, Adjusted 15.60% 12.10% 8.00% (9.10%)