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Financial Instruments and Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2017
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The table below presents disclosures about the financial assets and liabilities measured at fair value on a recurring basis in the Company’s financial statements (in millions):
|  | March 31, 2017 |  |  | December 31, 2016 |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Cash and cash equivalents |  | $ | 2,164 |  |  | $ | 2,164 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,179 |  |  | $ | 2,179 |  |  | $ | — |  |  | $ | — |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt |  |  | 804 |  |  |  | — |  |  |  | 804 |  |  |  | — |  |  |  | 835 |  |  |  | — |  |  |  | 835 |  |  |  | — |
Asset-backed securities |  |  | 757 |  |  |  | — |  |  |  | 757 |  |  |  | — |  |  |  | 792 |  |  |  | — |  |  |  | 792 |  |  |  | — |
Certificates of deposit placed through an account registry service (“CDARS”) |  |  | 224 |  |  |  | — |  |  |  | 224 |  |  |  | — |  |  |  | 246 |  |  |  | — |  |  |  | 246 |  |  |  | — |
U.S. government and agency notes |  |  | 101 |  |  |  | — |  |  |  | 101 |  |  |  | — |  |  |  | 140 |  |  |  | — |  |  |  | 140 |  |  |  | — |
Other fixed-income securities |  |  | 146 |  |  |  | — |  |  |  | 146 |  |  |  | — |  |  |  | 54 |  |  |  | — |  |  |  | 54 |  |  |  | — |
Other investments measured at NAV |  |  | 183 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 182 |  |  |  | — |  |  |  | — |  |  |  | — |
Restricted cash |  |  | 129 |  |  |  | 129 |  |  |  | — |  |  |  | — |  |  |  | 124 |  |  |  | 124 |  |  |  | — |  |  |  | — |
Enhanced equipment trust certificates (“EETC”) |  |  | 22 |  |  |  | — |  |  |  | — |  |  |  | 22 |  |  |  | 23 |  |  |  | — |  |  |  | — |  |  |  | 23
Carrying Values and Estimated Fair Values of Financial Instruments | The table below presents the carrying values and estimated fair values of financial instruments not presented in the tables above (in millions):
|  | Fair Value of Debt by Fair Value Hierarchy Level |
|  | March 31, 2017 |  |  | December 31, 2016 |
|  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
|  |  |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  |  |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Long-term debt |  | $ | 11,894 |  |  | $ | 12,321 |  |  | $ | — |  |  | $ | 9,040 |  |  | $ | 3,281 |  |  | $ | 10,767 |  |  | $ | 11,055 |  |  | $ | — |  |  | $ | 8,184 |  |  | $ | 2,871 |

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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 assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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