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FINANCING ACTIVITIES (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments |
(in millions) |  | December 31, 2021 |  | December 31, 2020
2.75% Notes due 2022 |  | $ | 300 |  |  | $ | 300 |
Pass Through Certificates due 2022 - 6.24% |  | 71 |  |  | 137 |
4.75% Notes due 2023 |  | 1,250 |  |  | 1,250 |
1.25% Convertible Notes due 2025 |  | 1,842 |  |  | 1,945 |
5.25% Notes due 2025 |  | 1,550 |  |  | 1,550 |
Term Loan Agreement payable through 2025 |  | — |  |  | 119 |
3.00% Notes due 2026 |  | 300 |  |  | 300 |
Term Loan Agreement payable through 2026 |  | — |  |  | 159 |
3.45% Notes due 2027 |  | 300 |  |  | 300 |
5.125% Notes due 2027 |  | 2,000 |  |  | 2,000 |
7.375% Debentures due 2027 |  | 116 |  |  | 119 |
Term Loan Agreement payable through 2028 |  | — |  |  | 184 |
2.625% Notes due 2030 |  | 500 |  |  | 500 |
1.000% Payroll Support Program Loan due April 2030 (See Note 2) |  | 976 |  |  | 976 |
1.000% Payroll Support Program Loan due January 2031 (See Note 2) |  | 566 |  |  | — |
1.000% Payroll Support Program Loan due April 2031 (See Note 2) |  | 526 |  |  | — |
Finance leases |  | 459 |  |  | 542
|  | $ | 10,756 |  |  | $ | 10,381 |
Less current maturities |  | 453 |  |  | 220 |
Less debt discount and issuance costs |  | 29 |  |  | 50 |
|  | $ | 10,274 |  |  | $ | 10,111 |
Convertible Debt | The following table details the equity and liability component recognized related to the Convertible Notes as of December 31, 2021 and 2020:
(in millions) | December 31, 2021 |  | December 31, 2020
Carrying amount of equity component | $ | 311 |  |  | $ | 403 |
Liability component: |  |  |
Principal amount | $ | 2,097 |  |  | $ | 2,300 |
Unamortized debt discount | (255) |  |  | (355) |
Net carrying amount | $ | 1,842 |  |  | $ | 1,945 |

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