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LEASES LEASES - LEASE COST (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
Rate
Lessee, Lease, Description [Line Items]  
Operating Lease, Expense $ 171
Sublease Income (3)
Lease, Cost $ 168
Aircraft [Member]  
Lessee, Lease, Description [Line Items]  
Operating Lease, Weighted Average Discount Rate, Percent | Rate 4.20%
Operating Lease, Cost $ 61
Operating Lease, Weighted Average Remaining Lease Term 6 years 8 months 12 days
CPA Aircraft [Member]  
Lessee, Lease, Description [Line Items]  
Operating Lease, Weighted Average Discount Rate, Percent | Rate 4.30%
Operating Lease, Cost $ 20
Operating Lease, Weighted Average Remaining Lease Term 10 years
Airport Facilities [Member]  
Lessee, Lease, Description [Line Items]  
Operating Lease, Weighted Average Discount Rate, Percent | Rate 4.10%
Operating Lease, Cost $ 85
Operating Lease, Weighted Average Remaining Lease Term 10 years 7 months 6 days
Corporate real estate [Member]  
Lessee, Lease, Description [Line Items]  
Operating Lease, Weighted Average Discount Rate, Percent | Rate 4.20%
Operating Lease, Cost $ 5
Operating Lease, Weighted Average Remaining Lease Term 38 years 8 months 12 days