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LEASES - Maturity of Lease Liabilities (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Aircraft Leases [Member] |
Lessee, Lease, Description [Line Items] |
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months | $ 245
Lessee, Operating Lease, Liability, Payments, Due Year Two | 216
Lessee, Operating Lease, Liability, Payments, Due Year Three | 190
Lessee, Operating Lease, Liability, Payments, Due Year Four | 133
Lessee, Operating Lease, Liability, Payments, Due Year Five | 81
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 331
Lessee, Operating Lease, Liability, Payments, Due | 1,196
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 151
Operating Lease, Liability | 1,045
CPA Aircraft [Member] |
Lessee, Lease, Description [Line Items] |
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months | 79
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 | 329
Lessee, Operating Lease, Liability, Payments, Due | 724
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 128
Operating Lease, Liability | 596
Airport Facilities [Member] |
Lessee, Lease, Description [Line Items] |
Operating Leases, Future Minimum Payments, Next Rolling Twelve Months | 3
Lessee, Operating Lease, Liability, Payments, Due Year Two | 2
Lessee, Operating Lease, Liability, Payments, Due Year Three | 2
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 | 11
Lessee, Operating Lease, Liability, Payments, Due | 22
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 4
Operating Lease, Liability | 18
Corporate real estate [Member] |
Lessee, Lease, Description [Line Items] |
Operating Leases, Future Minimum Payments, Next Rolling Twelve Months | 8
Lessee, Operating Lease, Liability, Payments, Due Year Two | 6
Lessee, Operating Lease, Liability, Payments, Due Year Three | 5
Lessee, Operating Lease, Liability, Payments, Due Year Four | 5
Lessee, Operating Lease, Liability, Payments, Due Year Five | 5
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 74
Lessee, Operating Lease, Liability, Payments, Due | 103
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 54
Operating Lease, Liability | $ 49

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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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Data Type: | xbrli:stringItemType
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Period Type: | duration

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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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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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 next 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 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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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Details
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