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LEASES LEASES - LEASE COST (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Rate
Sep. 30, 2019
USD ($)
Rate
Lessee, Lease, Description [Line Items]    
Operating Lease, Expense $ 174 $ 494
Sublease Income (3) (9)
Lease, Cost $ 171 $ 485
Aircraft [Member]    
Lessee, Lease, Description [Line Items]    
Operating Lease, Weighted Average Discount Rate, Percent | Rate 4.10% 4.10%
Operating Lease, Cost $ 62 $ 186
Operating Lease, Weighted Average Remaining Lease Term 6 years 8 months 12 days 6 years 8 months 12 days
CPA Aircraft [Member]    
Lessee, Lease, Description [Line Items]    
Operating Lease, Weighted Average Discount Rate, Percent | Rate 4.30% 4.30%
Operating Lease, Cost $ 20 $ 61
Operating Lease, Weighted Average Remaining Lease Term 9 years 6 months 9 years 6 months
Airport Facilities [Member]    
Lessee, Lease, Description [Line Items]    
Operating Lease, Weighted Average Discount Rate, Percent | Rate 4.10% 4.10%
Operating Lease, Cost $ 87 $ 233
Operating Lease, Weighted Average Remaining Lease Term 10 years 2 months 12 days 10 years 2 months 12 days
Corporate real estate [Member]    
Lessee, Lease, Description [Line Items]    
Operating Lease, Weighted Average Discount Rate, Percent | Rate 4.30% 4.30%
Operating Lease, Cost $ 5 $ 14
Operating Lease, Weighted Average Remaining Lease Term 36 years 4 months 24 days 36 years 4 months 24 days