WORLDWIDE PANDEMIC - Payroll Support Program (Details) - USD ($) shares in Thousands, $ in Millions										2 Months Ended	5 Months Ended	6 Months Ended	12 Months Ended			14 Months Ended
	Jun. 03, 2021	Apr. 23, 2021	Mar. 05, 2021	Jan. 15, 2021	Sep. 30, 2020	Jul. 30, 2020	Jun. 30, 2020	May 29, 2020	Apr. 21, 2020	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2021
Unusual or Infrequent Item, or Both [Line Items]
Promissory Note													$ 0	$ 3,683	$ 0
COVID - 19 | United States Department of Treasury
Unusual or Infrequent Item, or Both [Line Items]
Grant																$ 5,040
Promissory Note																2,068
Warrants																85
Total Payroll Support Proceeds																$ 7,193
Warrants (shares)													4,798
PSP1 Payroll Support Program | United States Department of Treasury
Unusual or Infrequent Item, or Both [Line Items]
Grant					$ 64	$ 225	$ 448	$ 448	$ 1,152		$ 2,337
Promissory Note					28	97	196	196	459		976
Warrants					2	3	9	8	18		40
Total Payroll Support Proceeds					$ 94	$ 326	$ 652	$ 652	$ 1,630		$ 3,354
Warrants (shares)					78	268	536	536	1,258		78			2,676
PSP2 Payroll Support Program | United States Department of Treasury
Unusual or Infrequent Item, or Both [Line Items]
Grant		$ 177	$ 591	$ 625								$ 1,393
Promissory Note		78	259	229								566
Warrants		4	14	9								27
Total Payroll Support Proceeds		$ 259	$ 864	$ 864								$ 1,987
Warrants (shares)		168	560	495									1,223
PSP3 Payroll Support Program | United States Department of Treasury
Unusual or Infrequent Item, or Both [Line Items]
Grant	$ 640	$ 670								$ 1,310
Promissory Note	278	248								526
Warrants	9	9								18
Total Payroll Support Proceeds	$ 926	$ 926								$ 1,852
Warrants (shares)	475	424											899