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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021 |  | December 31, 2020
| Level 1 |  | Level 2 |  | Total |  | Level 1 |  | Level 2 |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency securities | $ | 331 |  |  | $ | — |  |  | $ | 331 |  |  | $ | 407 |  |  | $ | — |  |  | $ | 407 |
Equity mutual funds | 6 |  |  | — |  |  | 6 |  |  | 7 |  |  | — |  |  | 7 |
Foreign government bonds | — |  |  | 38 |  |  | 38 |  |  | — |  |  | 20 |  |  | 20 |
Asset-backed securities | — |  |  | 311 |  |  | 311 |  |  | — |  |  | 224 |  |  | 224 |
Mortgage-backed securities | — |  |  | 232 |  |  | 232 |  |  | — |  |  | 290 |  |  | 290 |
Corporate notes and bonds | — |  |  | 1,663 |  |  | 1,663 |  |  | — |  |  | 978 |  |  | 978 |
Municipal securities | — |  |  | 65 |  |  | 65 |  |  | — |  |  | 50 |  |  | 50 |
Total Marketable securities | 337 |  |  | 2,309 |  |  | 2,646 |  |  | 414 |  |  | 1,562 |  |  | 1,976
Derivative instruments |  |  |  |  |  |  |  |  |  |  |
Fuel hedge contracts - call options | — |  |  | 81 |  |  | 81 |  |  | — |  |  | 15 |  |  | 15 |
Total Assets | $ | 337 |  |  | $ | 2,390 |  |  | $ | 2,727 |  |  | $ | 414 |  |  | $ | 1,577 |  |  | $ | 1,991 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |
Interest rate swap agreements | — |  |  | (9) |  |  | (9) |  |  | — |  |  | (25) |  |  | (25) |
Total Liabilities | $ | — |  |  | $ | (9) |  |  | $ | (9) |  |  | $ | — |  |  | $ | (25) |  |  | $ | (25) |
Fixed-rate debt on the consolidated balance sheet and the estimated fair value of long-term fixed-rate debt (in millions):
| December 31, 2021 |  | December 31, 2020
Total fixed rate debt | $ | 1,821 |  |  | $ | 1,662 |
Estimated fair value | $ | 1,919 |  |  | $ | 1,778 |
Schedule of Realized Gain (Loss) [Table Text Block] | Proceeds from sales of marketable securities were $3.6 billion, $2.3 billion and $1.7 billion in 2021, 2020, and 2019.
Schedule of Debt Investment Maturities [Table Text Block] | Maturities for marketable securities (in millions):
December 31, 2021 | Cost Basis |  | Fair Value
Due in one year or less | $ | 1,064 |  |  | $ | 1,065 |
Due after one year through five years | 1,537 |  |  | 1,532 |
Due after five years | 44 |  |  | 42 |
Total | $ | 2,645 |  |  | $ | 2,639 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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