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INVESTMENTS AND RESTRICTED CASH (Tables) | 6 Months Ended
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Jun. 30, 2018
Marketable Securities [Abstract] |
Available-for-sale Securities | The following is a summary of marketable securities classified as trading and available-for-sale as of June 30, 2018 and December 31, 2017 (in millions):
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
June 30, 2018: |  |  |  |  |  |  |
Current trading marketable securities: |  |  |  |  |  |  |
Corporate debt securities | $ | 75 |  |  | $ | — |  |  | $ | — |  |  | $ | 75 |
Equity securities | 2 |  |  | — |  |  | — |  |  | 2 |
Total trading marketable securities | 77 |  |  | — |  |  | — |  |  | 77 |
Current available-for-sale securities: |  |  |  |  |  |  |
U.S. government and agency debt securities | 306 |  |  | 1 |  |  | (4 | ) |  | 303 |
Mortgage and asset-backed debt securities | 86 |  |  | — |  |  | (1 | ) |  | 85 |
Corporate debt securities | 243 |  |  | — |  |  | (2 | ) |  | 241 |
Non-U.S. government debt securities | 14 |  |  | — |  |  | — |  |  | 14 |
Total available-for-sale marketable securities | 649 |  |  | 1 |  |  | (7 | ) |  | 643 |
Total current marketable securities | $ | 726 |  |  | $ | 1 |  |  | $ | (7 | ) |  | $ | 720 |
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
December 31, 2017: |  |  |  |  |  |  |
Current trading marketable securities: |  |  |  |  |  |  |
Corporate debt securities | $ | 75 |  |  | $ | — |  |  | $ | — |  |  | $ | 75 |
Carbon credit investments (1) | 77 |  |  | 16 |  |  | — |  |  | 93 |
Total trading marketable securities | 152 |  |  | 16 |  |  | — |  |  | 168 |
Current available-for-sale securities: |  |  |  |  |  |  |
U.S. government and agency debt securities | 286 |  |  | — |  |  | (3 | ) |  | 283 |
Mortgage and asset-backed debt securities | 86 |  |  | — |  |  | — |  |  | 86 |
Corporate debt securities | 201 |  |  | 1 |  |  | (1 | ) |  | 201 |
Equity securities | 2 |  |  | — |  |  | — |  |  | 2 |
Non-U.S. government debt securities | 9 |  |  | — |  |  | — |  |  | 9 |
Total available-for-sale marketable securities | 584 |  |  | 1 |  |  | (4 | ) |  | 581 |
Total current marketable securities | $ | 736 |  |  | $ | 17 |  |  | $ | (4 | ) |  | $ | 749 |
(1) These investments are hedged with forward contracts that are not designated in hedging relationships. See Note 14 for offsetting statement of consolidated income impact.
Investments Classified by Contractual Maturity Date | The amortized cost and estimated fair value of marketable securities at June 30, 2018, by contractual maturity, are shown below (in millions). Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
| Cost |  | Estimated Fair Value
Due in one year or less | $ | 193 |  |  | $ | 193 |
Due after one year through three years | 434 |  |  | 430 |
Due after three years through five years | 24 |  |  | 23 |
Due after five years | 73 |  |  | 72 |
| 724 |  |  | 718 |
Equity securities | 2 |  |  | 2 |
| $ | 726 |  |  | $ | 720 |
Cash and Cash Equivalents and Restricted Cash | A reconciliation of cash and cash equivalents and restricted cash from the consolidated balance sheets to the statements of consolidated cash flows is shown below (in millions):
|  | June 30, 2018 |  | December 31, 2017 |  | June 30, 2017
Cash and cash equivalents |  | $ | 4,214 |  |  | $ | 3,320 |  |  | $ | 3,544 |
Restricted cash |  | 277 |  |  | 449 |  |  | 447 |
Total cash, cash equivalents and restricted cash |  | $ | 4,491 |  |  | $ | 3,769 |  |  | $ | 3,991 |
Fair Value, Assets Measured on Recurring Basis | The following table presents information about our investments measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value (in millions):
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Balance
June 30, 2018: |  |  |  |  |  |  |
Marketable Securities: |  |  |  |  |  |  |
U.S. government and agency debt securities | $ | 303 |  |  | $ | — |  |  | $ | — |  |  | $ | 303 |
Mortgage and asset-backed debt securities | — |  |  | 85 |  |  | — |  |  | 85 |
Corporate debt securities | — |  |  | 316 |  |  | — |  |  | 316 |
Equity securities | — |  |  | 2 |  |  | — |  |  | 2 |
Non-U.S. government debt securities | — |  |  | 14 |  |  | — |  |  | 14 |
Total marketable securities | 303 |  |  | 417 |  |  | — |  |  | 720 |
Other non-current investments | 19 |  |  | — |  |  | 2 |  |  | 21 |
Total | $ | 322 |  |  | $ | 417 |  |  | $ | 2 |  |  | $ | 741 |
December 31, 2017: |  |  |  |  |  |  |
Marketable Securities: |  |  |  |  |  |  |
U.S. government and agency debt securities | $ | 283 |  |  | $ | — |  |  | $ | — |  |  | $ | 283 |
Mortgage and asset-backed debt securities |  |  |  | 86 |  |  | — |  |  | 86 |
Corporate debt securities | — |  |  | 276 |  |  | — |  |  | 276 |
Equity securities | — |  |  | 2 |  |  | — |  |  | 2 |
Non-U.S. government debt securities | — |  |  | 9 |  |  | — |  |  | 9 |
Carbon credit investments | 93 |  |  | — |  |  | — |  |  | 93 |
Total marketable securities | 376 |  |  | 373 |  |  | — |  |  | 749 |
Other non-current investments | 19 |  |  | — |  |  | 6 |  |  | 25 |
Total | $ | 395 |  |  | $ | 373 |  |  | $ | 6 |  |  | $ | 774 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | There were no transfers of investments between Level 1 and Level 2 during the three and six months ended June 30, 2018 and 2017.

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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 measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + 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 (c) -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 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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