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FAIR VALUE MEASUREMENTS (Tables) | 3 Months Ended
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Mar. 31, 2016
Fair Value Disclosures [Abstract] |
Fair Value, Measurement Inputs, Disclosure | Fair values of financial instruments on the consolidated balance sheet (in millions):
March 31, 2016 | Level 1 |  | Level 2 |  | Total
Assets |  |  |  |  |
Marketable securities |  |  |  |  |
U.S. government and agency securities | $ | 412 |  |  | $ | — |  |  | $ | 412 |
Foreign government bonds | — |  |  | 28 |  |  | 28 |
Asset-backed securities | — |  |  | 154 |  |  | 154 |
Mortgage-backed securities | — |  |  | 121 |  |  | 121 |
Corporate notes and bonds | — |  |  | 754 |  |  | 754 |
Municipal securities | — |  |  | 17 |  |  | 17 |
Total Marketable securities | 412 |  |  | 1,074 |  |  | 1,486 |
Derivative instruments |  |  |  |  |
Fuel hedge call options | — |  |  | 8 |  |  | 8 |
Total Assets | 412 |  |  | 1,082 |  |  | 1,494 |
Liabilities |  |  |  |  |
Derivative instruments |  |  |  |  |
Interest rate swap agreements | — |  |  | (22 | ) |  | (22 | )
Total Liabilities | — |  |  | (22 | ) |  | (22 | )
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 |
Total Marketable securities | 253 |  |  | 1,002 |  |  | 1,255 |
Derivative instruments |  |  |  |  |
Fuel hedge call options | — |  |  | 4 |  |  | 4 |
Total Assets | 253 |  |  | 1,006 |  |  | 1,259 |
Liabilities |  |  |  |  |
Derivative instruments |  |  |  |  |
Interest rate swap agreements | — |  |  | (18 | ) |  | (18 | )
Total Liabilities | — |  |  | (18 | ) |  | (18 | )
Fair Value, by Balance Sheet Grouping | 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) is as follows:
| March 31, 2016 |  | December 31, 2015
Carrying amount | $ | 491 |  |  | $ | 520 |
Fair value | 529 |  |  | 557 |

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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=73719730&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=66048111&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=73719730&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=73719730&loc=d3e13433-108611 + Details
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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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