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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] | Fair values of financial instruments on the consolidated balance sheet (in millions):
| December 31, 2023 |  | December 31, 2022
| Level 1 |  | Level 2 |  | Total |  | Level 1 |  | Level 2 |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency securities | $ | 387 |  |  | $ | — |  |  | $ | 387 |  |  | $ | 505 |  |  | $ | — |  |  | $ | 505 |
Equity mutual funds | 5 |  |  | — |  |  | 5 |  |  | 5 |  |  | — |  |  | 5 |
Foreign government bonds | — |  |  | 10 |  |  | 10 |  |  | — |  |  | 25 |  |  | 25 |
Asset-backed securities | — |  |  | 192 |  |  | 192 |  |  | — |  |  | 261 |  |  | 261 |
Mortgage-backed securities | — |  |  | 115 |  |  | 115 |  |  | — |  |  | 196 |  |  | 196 |
Corporate notes and bonds | — |  |  | 763 |  |  | 763 |  |  | — |  |  | 1,025 |  |  | 1,025 |
Municipal securities | — |  |  | 38 |  |  | 38 |  |  | — |  |  | 62 |  |  | 62 |
Total Marketable securities | 392 |  |  | 1,118 |  |  | 1,510 |  |  | 510 |  |  | 1,569 |  |  | 2,079
Derivative instruments |  |  |  |  |  |  |  |  |  |  |
Fuel hedge contracts - call options | — |  |  | 11 |  |  | 11 |  |  | — |  |  | 44 |  |  | 44 |
Interest rate swap agreements | — |  |  | 8 |  |  | 8 |  |  | — |  |  | 15 |  |  | 15 |
Total Assets | $ | 392 |  |  | $ | 1,137 |  |  | $ | 1,529 |  |  | $ | 510 |  |  | $ | 1,628 |  |  | $ | 2,138 |
Fixed-rate debt on the consolidated balance sheet and the estimated fair value of long-term fixed-rate debt (in millions):
| December 31, 2023 |  | December 31, 2022
Fixed-rate debt | $ | 1,515 |  |  | $ | 1,660 |
Estimated fair value | $ | 1,382 |  |  | $ | 1,473 |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Certain assets and liabilities are recognized or disclosed at fair value on a nonrecurring basis, including property, plant and equipment, operating lease assets, goodwill, and intangible assets. These assets are subject to fair valuation when there is evidence of impairment. Refer to Note 2 for discussion regarding impairment charges recorded in the year.
Schedule of Realized Gain (Loss) [Table Text Block] | Proceeds from sales of marketable securities were $1.2 billion, $2.3 billion, and $3.6 billion in 2023, 2022, and 2021.
Schedule of Debt Investment Maturities [Table Text Block] | Maturities for marketable securities (in millions):
December 31, 2023 | Cost Basis |  | Fair Value
Due in one year or less | $ | 372 |  |  | $ | 366 |
Due after one year through five years | 1,126 |  |  | 1,091 |
Due after five years through nine years | 36 |  |  | 33 |
Due after 10 years | 17 |  |  | 15 |
No maturity date | 4 |  |  | 5 |
Total | $ | 1,555 |  |  | $ | 1,510 |

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