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CASH AND INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2018
Investments and Cash [Abstract] |
Schedule of Unrealized Loss on Investments [Table Text Block] | The following table presents the age of gross unrealized losses and fair value by investment category for all securities in a loss position as of December 31, 2018 (in millions):
| Less Than 12 Months |  | 12 Months or More |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. government and agency debt securities | $ | 54 |  |  | $ | — |  |  | $ | 111 |  |  | $ | (2 | ) |  | $ | 165 |  |  | $ | (2 | )
Mortgage and asset-backed debt securities | 24 |  |  | — |  |  | 36 |  |  | (1 | ) |  | 60 |  |  | (1 | )
Corporate debt securities | 99 |  |  | — |  |  | 81 |  |  | (2 | ) |  | 180 |  |  | (2 | )
Non-U.S. government debt securities | — |  |  | — |  |  | 5 |  |  | — |  |  | 5 |  |  | — |
Total marketable securities | $ | 177 |  |  | $ | — |  |  | $ | 233 |  |  | $ | (5 | ) |  | $ | 410 |  |  | $ | (5 | )
Summary of Marketable Securities | The following is a summary of marketable securities classified as trading and available-for-sale at December 31, 2018 and 2017 (in millions):
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
2018 |  |  |  |  |  |  |
Current trading marketable securities: |  |  |  |  |  |  |
Corporate debt securities | $ | 137 |  |  | $ | — |  |  | $ | — |  |  | $ | 137 |
Equity securities | 2 |  |  | — |  |  | — |  |  | 2 |
Total trading marketable securities | 139 |  |  | — |  |  | — |  |  | 139 |
Current available-for-sale marketable securities: |  |  |  |  |  |  |
U.S. government and agency debt securities | 297 |  |  | 1 |  |  | (1 | ) |  | 297 |
Mortgage and asset-backed debt securities | 82 |  |  | — |  |  | (1 | ) |  | 81 |
Corporate debt securities | 275 |  |  | — |  |  | (2 | ) |  | 273 |
Non-U.S. government debt securities | 20 |  |  | — |  |  | — |  |  | 20 |
Total available-for-sale marketable securities | 674 |  |  | 1 |  |  | (4 | ) |  | 671 |
Total current marketable securities | $ | 813 |  |  | $ | 1 |  |  | $ | (4 | ) |  | $ | 810 |
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
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 marketable 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 15 for offsetting statement of consolidated income impact.
Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity | The amortized cost and estimated fair value of marketable securities at December 31, 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 | $ | 268 |  |  | $ | 267 |
Due after one year through three years | 448 |  |  | 447 |
Due after three years through five years | 22 |  |  | 22 |
Due after five years | 73 |  |  | 72 |
| 811 |  |  | 808 |
Equity securities | 2 |  |  | 2 |
| $ | 813 |  |  | $ | 810 |
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 in shown below (in millions):
| December 31, 2018 |  | December 31, 2017 |  | December 31, 2016
Cash and cash equivalents | $ | 4,225 |  |  | $ | 3,320 |  |  | $ | 3,476 |
Restricted cash | $ | 142 |  |  | $ | 449 |  |  | $ | 445 |
Total cash, cash equivalents and restricted cash | $ | 4,367 |  |  | $ | 3,769 |  |  | $ | 3,921 |
Investments Measured at Fair Value on a Recurring Basis | The following table presents information about our investments measured at fair value on a recurring basis as of December 31, 2018 and 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) |  | Total
2018 |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |
U.S. government and agency debt securities | $ | 297 |  |  | $ | — |  |  | $ | — |  |  | $ | 297 |
Mortgage and asset-backed debt securities | — |  |  | 81 |  |  | — |  |  | 81 |
Corporate debt securities | — |  |  | 410 |  |  | — |  |  | 410 |
Equity securities | — |  |  | 2 |  |  | — |  |  | 2 |
Non-U.S. government debt securities | — |  |  | 20 |  |  | — |  |  | 20 |
Total marketable securities | 297 |  |  | 513 |  |  | — |  |  | 810 |
Other non-current investments | 19 |  |  | — |  |  | 2 |  |  | 21 |
Total | $ | 316 |  |  | $ | 513 |  |  | $ | 2 |  |  | $ | 831 |
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
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 |
Changes in Level 3 Instruments Measured on a Recurring Basis | There were no transfers of investments between Level 1 and Level 2 during the years ended December 31, 2018 and 2017.

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