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FINANCING ACTIVITIES - Schedule of Long-term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Jul. 31, 2020 | May 04, 2020 | May 01, 2020 | Feb. 29, 2020 | Nov. 30, 2017 | Nov. 30, 2016 | Feb. 28, 1997
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Finance leases | $ 459 | $ 542 |  |  |  |  |  |  |
Debt and lease obligation | 10,756 | 10,381 |  |  |  |  |  |  |
Less current maturities | (453) | (220) |  |  |  |  |  |  |
Less debt discount and issuance costs | 29 | 50 |  |  |  |  |  |  |
Long-term debt less current maturities | 10,274 | 10,111 |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount | $ 2,097 | 2,300 |  |  |  |  |  |  |
2.75% Notes due 2022 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) |  |  |  |  |  |  | 2.75% |  |
2.75% Notes due 2022 | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) | 2.75% |  |  |  |  |  |  |  |
Principal amount | $ 300 | 300 |  |  |  |  |  |  |
Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) | 6.24% |  |  |  |  |  |  |  |
Principal amount | $ 71 | 137 |  |  |  |  |  |  |
4.75% Notes due 2023 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) |  |  |  | 4.75% |  |  |  |  |
4.75% Notes due 2023 | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) | 4.75% |  |  |  |  |  |  |  |
Principal amount | $ 1,250 | 1,250 |  |  |  |  |  |  |
1.25% Convertible Notes due 2025 | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) | 1.25% |  |  |  |  |  |  |  |
1.25% Convertible Notes due 2025 | Convertible Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) |  |  |  |  | 1.25% |  |  |  |
Principal amount | $ 1,842 | $ 1,945 |  |  |  |  |  |  |
5.25% Notes due 2025 | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) | 5.25% | 5.25% |  |  |  |  |  |  |
Principal amount | $ 1,550 | $ 1,550 | $ 300 |  |  |  |  |  |
Term Loan Agreement payable through 2025 | Notes Payable to Banks |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount | $ 0 | 119 |  |  |  |  |  |  |
3.00% Notes due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) |  |  |  |  |  |  |  | 3.00% |
3.00% Notes due 2026 | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) | 3.00% |  |  |  |  |  |  |  |
Principal amount | $ 300 | 300 |  |  |  |  |  |  |
Term Loan Agreement Due 2026 - 3.03% | Notes Payable to Banks |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount | $ 0 | 159 |  |  |  |  |  |  |
3.45% Notes due 2027 | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) | 3.45% |  |  |  |  |  |  |  |
Principal amount | $ 300 | $ 300 |  |  |  |  |  |  |
5.125% Notes due 2027 | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) | 5.125% | 5.125% |  |  |  |  |  |  |
Principal amount | $ 2,000 | $ 2,000 | $ 700 |  |  |  |  |  |
7.375% Debentures due 2027 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) |  |  |  |  |  |  |  |  | 7.375%
7.375% Debentures due 2027 | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) | 7.375% |  |  |  |  |  |  |  |
Principal amount | $ 116 | 119 |  |  |  |  |  |  |
Term Loan Agreement payable through 2028 | Notes Payable to Banks |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount | 0 | 184 |  |  |  |  |  |  |
2.625% Notes due 2030 | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) |  |  |  |  |  | 2.625% |  |  |
Principal amount | $ 500 | 500 |  |  |  |  |  |  |
1.000% Payroll Support Program Loan due April 2030 (See Note 2) | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) | 1.00% |  |  |  |  |  |  |  |
Principal amount | $ 976 | 976 |  |  |  |  |  |  |
1.000% Payroll Support Program Loan due January 2031 (See Note 2) | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) | 1.00% |  |  |  |  |  |  |  |
Principal amount | $ 566 | 0 |  |  |  |  |  |  |
1.000% Payroll Support Program Loan due April 2031 (See Note 2) | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate stated in the debt agreement (as a percent) | 1.00% |  |  |  |  |  |  |  |
Principal amount | $ 526 | $ 0 |  |  |  |  |  |  |

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