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FAIR VALUE MEASUREMENTS | 3 Months Ended
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Mar. 31, 2016
Fair Value Disclosures [Abstract] |
FAIR VALUE MEASUREMENTS | FAIR VALUE MEASUREMENTS In determining fair value, there is a three-level hierarchy based on the reliability of the inputs used. Level 1 refers to fair values based on quoted prices in active markets for identical assets or liabilities. Level 2 refers to fair values estimated using significant other observable inputs and Level 3 refers to fair values estimated using significant unobservable inputs. Fair Value of Financial Instruments on a Recurring Basis 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 | )
The Company uses the market and income approach to determine the fair value of marketable securities. U.S. government securities are Level 1 as the fair value is based on quoted prices in active markets. Foreign government bonds, asset-backed securities, mortgage-backed securities, corporate notes and bonds, and municipal securities are Level 2 as the fair value is based on standard valuation models that are calculated based on observable inputs such as quoted interest rates, yield curves, credit ratings of the security and other observable market information. The Company uses the market approach and the income approach to determine the fair value of derivative instruments. The fair value for fuel hedge call options is determined utilizing an option pricing model based on inputs that are readily available in active markets, or can be derived from information available in active markets. In addition, the fair value considers the exposure to credit losses in the event of non-performance by counterparties. Interest rate swap agreements are Level 2 as the fair value of these contracts is determined based on the difference between the fixed interest rate in the agreements and the observable LIBOR-based interest forward rates at period end, multiplied by the total notional value. The Company has no financial assets that are measured at fair value on a nonrecurring basis at March 31, 2016. Fair Value of Other Financial Instruments The Company used the following methods and assumptions to determine the fair value of financial instruments that are not recognized at fair value as described below. Cash and Cash Equivalents: Carried at amortized cost, which approximates fair value. Debt: The carrying amount of the Company's variable-rate debt approximates fair values. For fixed-rate debt, the Company uses the income approach to determine the estimated fair value, by using discounted cash flows using borrowing rates for comparable debt over the weighted life of the outstanding debt. The estimated fair value of the fixed-rate debt is Level 3 as certain inputs used are unobservable. 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 The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13504-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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