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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 |  |  |  |  |  | December 31, 2018 |  |  |  |
| Level 1 |  | Level 2 |  | Total |  | Level 1 |  | Level 2 |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency securities | $ | 330 |  |  | $ | — |  |  | $ | 330 |  |  | $ | 293 |  |  | $ | — |  |  | $ | 293 |
Equity mutual funds | 6 |  |  | — |  |  | 6 |  |  | — |  |  | — |  |  | — |
Foreign government bonds | — |  |  | 31 |  |  | 31 |  |  | — |  |  | 26 |  |  | 26 |
Asset-backed securities | — |  |  | 211 |  |  | 211 |  |  | — |  |  | 190 |  |  | 190 |
Mortgage-backed securities | — |  |  | 176 |  |  | 176 |  |  | — |  |  | 92 |  |  | 92 |
Corporate notes and bonds | — |  |  | 523 |  |  | 523 |  |  | — |  |  | 520 |  |  | 520 |
Municipal securities | — |  |  | 23 |  |  | 23 |  |  | — |  |  | 10 |  |  | 10 |
Total Marketable securities | 336 |  |  |  | 964 |  |  |  | 1,300 |  |  | 293 |  |  |  | 838 |  |  |  | 1,131 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |
Fuel hedge contracts - call options | — |  |  | 11 |  |  | 11 |  |  | — |  |  | 4 |  |  | 4 |
Interest rate swap agreements | — |  |  | 3 |  |  | 3 |  |  | — |  |  | 10 |  |  | 10 |
Total Assets | $ | 336 |  |  | $ | 978 |  |  | $ | 1,314 |  |  | $ | 293 |  |  | $ | 852 |  |  | $ | 1,145 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |
Interest rate swap agreements | — |  |  | (10) |  |  | (10) |  |  | — |  |  | (7) |  |  | (7) |
Total Liabilities | $ | — |  |  | $ | (10) |  |  | $ | (10) |  |  | $ | — |  |  | $ | (7) |  |  | $ | (7) |
Fixed-rate debt on the consolidated balance sheet and the estimated fair value of long-term fixed-rate debt (in millions):
| December 31, 2019 |  | December 31, 2018
Fixed rate debt at cost | $ | 473 |  |  | $ | 639 |
Non-recurring purchase price accounting fair value adjustment | 2 |  |  | 3 |
Total fixed rate debt | $ | 475 |  |  | $ | 642 |
Estimated fair value | $ | 483 |  |  | $ | 641 |
Schedule of Realized Gain (Loss) [Table Text Block] | Proceeds from sales of marketable securities were $1.7 billion, $1.1 billion and $1.4 billion in 2019, 2018, and 2017.
Schedule of Debt Investment Maturities [Table Text Block] | Maturities for marketable securities (in millions):
December 31, 2019 | Cost Basis |  | Fair Value
Due in one year or less | $ | 164 |  |  | $ | 165 |
Due after one year through five years | 1,102 |  |  | 1,114 |
Due after five years through 10 years | 16 |  |  | 16 |
Total | $ | 1,282 |  |  | $ | 1,295 |

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