COVID-19 PANDEMIC (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges	$ 3
Operating Lease, Impairment Loss	154
Inventory Write-down	2
Asset Impairment Charges	363
Impairment of Long-Lived Assets Held-for-use	204
Airbus
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges	0
Operating Lease, Impairment Loss	154
Inventory Write-down	2
Asset Impairment Charges	302
Impairment of Long-Lived Assets Held-for-use	146
Q400
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges	3
Operating Lease, Impairment Loss	0
Inventory Write-down	0
Asset Impairment Charges	61
Impairment of Long-Lived Assets Held-for-use	$ 58