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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015 | Level 1 |  | Level 2 |  | Total
Assets |  |  |  |  |
Marketable securities |  |  |  |  |
U.S. government and agency securities | $ | 253 |  |  | $ | — |  |  | $ | 253 |
Foreign government bonds | — |  |  | 31 |  |  | 31 |
Asset-backed securities | — |  |  | 130 |  |  | 130 |
Mortgage-backed securities | — |  |  | 116 |  |  | 116 |
Corporate notes and bonds | — |  |  | 708 |  |  | 708 |
Municipal securities | — |  |  | 17 |  |  | 17 |
Derivative instruments |  |  |  |  |
Fuel hedge contracts |  |  |  |  |
Call options | — |  |  | 4 |  |  | 4 |
Liabilities |  |  |  |  |
Derivative instruments |  |  |  |  |
Interest rate swap agreements | — |  |  | (18 | ) |  | (18 | )
December 31, 2014 | Level 1 |  | Level 2 |  | Total
Assets |  |  |  |  |
Marketable securities |  |  |  |  |
U.S. government and agency securities | $ | 166 |  |  | $ | — |  |  | $ | 166 |
Foreign government bonds | — |  |  | 25 |  |  | 25 |
Asset-backed securities | — |  |  | 130 |  |  | 130 |
Mortgage-backed securities | — |  |  | 126 |  |  | 126 |
Corporate notes and bonds | — |  |  | 645 |  |  | 645 |
Municipal securities | — |  |  | 18 |  |  | 18 |
Derivative instruments |  |  |  |  |
Fuel hedge contracts |  |  |  |  |
Call options | — |  |  | 7 |  |  | 7 |
Liabilities |  |  |  |  |
Derivative instruments |  |  |  |  |
Interest rate swap agreements | — |  |  | (19 | ) |  | (19 | )
Fixed-rate debt that is not carried at fair value on the consolidated balance sheet and the estimated fair value of long-term fixed-rate debt (in millions):
| 2015 |  | 2014
Carrying Amount | $ | 520 |  |  | $ | 614 |
Fair value | 557 |  |  | 666 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 + Details
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