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FAIR VALUE MEASUREMENTS (Tables) | 6 Months Ended
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Jun. 30, 2017
Fair Value Disclosures [Abstract] |
Fair Value, Assets Measured on Recurring Basis | Fair values of financial instruments on the consolidated balance sheet (in millions):
June 30, 2017 | Level 1 |  | Level 2 |  | Total
Assets |  |  |  |  |
Marketable securities |  |  |  |  |
U.S. government and agency securities | $ | 448 |  |  | $ | — |  |  | $ | 448 |
Foreign government bonds | — |  |  | 39 |  |  | 39 |
Asset-backed securities | — |  |  | 222 |  |  | 222 |
Mortgage-backed securities | — |  |  | 113 |  |  | 113 |
Corporate notes and bonds | — |  |  | 889 |  |  | 889 |
Municipal securities | — |  |  | 13 |  |  | 13 |
Total Marketable securities | 448 |  |  | 1,276 |  |  | 1,724 |
Derivative instruments |  |  |  |  |
Fuel hedge call options | — |  |  | 8 |  |  | 8 |
Interest rate swap agreements | — |  |  | 8 |  |  | 8 |
Total Assets | 448 |  |  | 1,292 |  |  | 1,740 |
Liabilities |  |  |  |  |
Derivative instruments |  |  |  |  |
Interest rate swap agreements | — |  |  | (12 | ) |  | (12 | )
Total Liabilities | — |  |  | (12 | ) |  | (12 | )
December 31, 2016 | Level 1 |  | Level 2 |  | Total
Assets |  |  |  |  |
Marketable securities |  |  |  |  |
U.S. government and agency securities | $ | 287 |  |  | $ | — |  |  | $ | 287 |
Foreign government bonds | — |  |  | 36 |  |  | 36 |
Asset-backed securities | — |  |  | 138 |  |  | 138 |
Mortgage-backed securities | — |  |  | 89 |  |  | 89 |
Corporate notes and bonds | — |  |  | 691 |  |  | 691 |
Municipal securities | — |  |  | 11 |  |  | 11 |
Total Marketable securities | 287 |  |  | 965 |  |  | 1,252 |
Derivative instruments |  |  |  |  |
Fuel hedge call options | — |  |  | 20 |  |  | 20 |
Total Assets | 287 |  |  | 985 |  |  | 1,272 |
Liabilities |  |  |  |  |
Derivative instruments |  |  |  |  |
Interest rate swap agreements | — |  |  | (5 | ) |  | (5 | )
Total Liabilities | — |  |  | (5 | ) |  | (5 | )
Fair Value, Liabilities Measured on Recurring Basis | Fair values of financial instruments on the consolidated balance sheet (in millions):
June 30, 2017 | Level 1 |  | Level 2 |  | Total
Assets |  |  |  |  |
Marketable securities |  |  |  |  |
U.S. government and agency securities | $ | 448 |  |  | $ | — |  |  | $ | 448 |
Foreign government bonds | — |  |  | 39 |  |  | 39 |
Asset-backed securities | — |  |  | 222 |  |  | 222 |
Mortgage-backed securities | — |  |  | 113 |  |  | 113 |
Corporate notes and bonds | — |  |  | 889 |  |  | 889 |
Municipal securities | — |  |  | 13 |  |  | 13 |
Total Marketable securities | 448 |  |  | 1,276 |  |  | 1,724 |
Derivative instruments |  |  |  |  |
Fuel hedge call options | — |  |  | 8 |  |  | 8 |
Interest rate swap agreements | — |  |  | 8 |  |  | 8 |
Total Assets | 448 |  |  | 1,292 |  |  | 1,740 |
Liabilities |  |  |  |  |
Derivative instruments |  |  |  |  |
Interest rate swap agreements | — |  |  | (12 | ) |  | (12 | )
Total Liabilities | — |  |  | (12 | ) |  | (12 | )
December 31, 2016 | Level 1 |  | Level 2 |  | Total
Assets |  |  |  |  |
Marketable securities |  |  |  |  |
U.S. government and agency securities | $ | 287 |  |  | $ | — |  |  | $ | 287 |
Foreign government bonds | — |  |  | 36 |  |  | 36 |
Asset-backed securities | — |  |  | 138 |  |  | 138 |
Mortgage-backed securities | — |  |  | 89 |  |  | 89 |
Corporate notes and bonds | — |  |  | 691 |  |  | 691 |
Municipal securities | — |  |  | 11 |  |  | 11 |
Total Marketable securities | 287 |  |  | 965 |  |  | 1,252 |
Derivative instruments |  |  |  |  |
Fuel hedge call options | — |  |  | 20 |  |  | 20 |
Total Assets | 287 |  |  | 985 |  |  | 1,272 |
Liabilities |  |  |  |  |
Derivative instruments |  |  |  |  |
Interest rate swap agreements | — |  |  | (5 | ) |  | (5 | )
Total Liabilities | — |  |  | (5 | ) |  | (5 | )
Activity for Marketable Securities | Activity for marketable securities (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Proceeds from sales and maturities | $ | 256 |  |  | $ | 217 |  |  | $ | 541 |  |  | $ | 357 |
Gross realized gains | — |  |  | 2 |  |  | 1 |  |  | 2 |
Gross realized losses | (1 | ) |  | (1 | ) |  | (2 | ) |  | (1 | )
Unrealized gains and losses (in millions):
| June 30, 2017 |  | December 31, 2016
Unrealized gains | 4 |  |  | 2 |
Unrealized losses | (5 | ) |  | (7 | )
Investments Classified by Contractual Maturity Date | Maturities for marketable securities (in millions):
June 30, 2017 | Cost Basis |  | Fair Value
Due in one year or less | $ | 253 |  |  | $ | 252 |
Due after one year through five years | 1,453 |  |  | 1,453 |
Due after five years through 10 years | 19 |  |  | 19 |
Due after 10 years | — |  |  | — |
Total | $ | 1,725 |  |  | $ | 1,724 |
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 is as follows (in millions):
| June 30, 2017 |  | December 31, 2016
Carrying amount | $ | 1,090 |  |  | $ | 1,179 |
Fair value | 1,105 |  |  | 1,199 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: 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 Reference 3: 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 + Details
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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 Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -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 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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