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LEASES MATURITIES OF LEASE LIABILITIES (Details) $ in Millions | Mar. 31, 2019 USD ($)
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Aircraft [Member] |
Lessee, Lease, Description [Line Items] |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | $ 191
Lessee, Operating Lease, Liability, Payments, Due Year Two | 228
Lessee, Operating Lease, Liability, Payments, Due Year Three | 189
Lessee, Operating Lease, Liability, Payments, Due Year Four | 164
Lessee, Operating Lease, Liability, Payments, Due Year Five | 110
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 287
Lessee, Operating Lease, Liability, Payments, Due | 1,169
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | (150)
Operating Lease, Liability | 1,019
CPA Aircraft [Member] |
Lessee, Lease, Description [Line Items] |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | 60
Lessee, Operating Lease, Liability, Payments, Due Year Two | 79
Lessee, Operating Lease, Liability, Payments, Due Year Three | 79
Lessee, Operating Lease, Liability, Payments, Due Year Four | 79
Lessee, Operating Lease, Liability, Payments, Due Year Five | 79
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 408
Lessee, Operating Lease, Liability, Payments, Due | 784
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | (148)
Operating Lease, Liability | 636
Airport Facilities [Member] |
Lessee, Lease, Description [Line Items] |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | 2
Lessee, Operating Lease, Liability, Payments, Due Year Two | 3
Lessee, Operating Lease, Liability, Payments, Due Year Three | 3
Lessee, Operating Lease, Liability, Payments, Due Year Four | 2
Lessee, Operating Lease, Liability, Payments, Due Year Five | 2
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 12
Lessee, Operating Lease, Liability, Payments, Due | 24
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | (5)
Operating Lease, Liability | 19
Corporate real estate [Member] |
Lessee, Lease, Description [Line Items] |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | 6
Lessee, Operating Lease, Liability, Payments, Due Year Two | 7
Lessee, Operating Lease, Liability, Payments, Due Year Three | 6
Lessee, Operating Lease, Liability, Payments, Due Year Four | 3
Lessee, Operating Lease, Liability, Payments, Due Year Five | 2
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 73
Lessee, Operating Lease, Liability, Payments, Due | 97
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | (53)
Operating Lease, Liability | $ 44

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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