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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 |  |  |

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