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LEASES - Maturity of Lease Liabilities (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Aircraft Leases [Member] |
Lessee, Lease, Description [Line Items] |
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months | $ 244
Lessee, Operating Lease, Liability, Payments, Due Year Two | 195
Lessee, Operating Lease, Liability, Payments, Due Year Three | 135
Lessee, Operating Lease, Liability, Payments, Due Year Four | 83
Lessee, Operating Lease, Liability, Payments, Due Year Five | 76
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 257
Lessee, Operating Lease, Liability, Payments, Due | 990
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 114
Operating Lease, Liability | 876
CPA Aircraft [Member] |
Lessee, Lease, Description [Line Items] |
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months | 84
Lessee, Operating Lease, Liability, Payments, Due Year Two | 84
Lessee, Operating Lease, Liability, Payments, Due Year Three | 84
Lessee, Operating Lease, Liability, Payments, Due Year Four | 84
Lessee, Operating Lease, Liability, Payments, Due Year Five | 84
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 261
Lessee, Operating Lease, Liability, Payments, Due | 681
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 71
Operating Lease, Liability | 610
Airport Facilities [Member] |
Lessee, Lease, Description [Line Items] |
Operating Leases, Future Minimum Payments, Next Rolling Twelve Months | 2
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 | 9
Lessee, Operating Lease, Liability, Payments, Due | 19
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 3
Operating Lease, Liability | 16
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 | 7
Lessee, Operating Lease, Liability, Payments, Due Year Three | 7
Lessee, Operating Lease, Liability, Payments, Due Year Four | 6
Lessee, Operating Lease, Liability, Payments, Due Year Five | 4
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 78
Lessee, Operating Lease, Liability, Payments, Due | 110
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 54
Operating Lease, Liability | $ 56

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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 payment 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=121609121&loc=SL77918701-209980 + Details
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X
- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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=121609121&loc=SL77918701-209980 + Details
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X
- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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=121609121&loc=SL77918701-209980 + Details
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X
- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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=121609121&loc=SL77918701-209980 + Details
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X
- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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=121609121&loc=SL77918701-209980 + Details
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X
- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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=121609121&loc=SL77918701-209980 + Details
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X
- 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=121609121&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=121603541&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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