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CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2016
Cash, Cash Equivalents, and Short-term Investments [Abstract] |
Schedule of Cash, Cash Equivalents and Short-term Investments | Components for cash, cash equivalents and marketable securities (in millions):
June 30, 2016 | Cost Basis |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Cash | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Cash equivalents | 81 |  |  | — |  |  | — |  |  | 81 |
Cash and cash equivalents | 81 |  |  | — |  |  | — |  |  | 81 |
U.S. government and agency securities | 430 |  |  | 3 |  |  | — |  |  | 433 |
Foreign government bonds | 32 |  |  | — |  |  | — |  |  | 32 |
Asset-backed securities | 160 |  |  | 1 |  |  | — |  |  | 161 |
Mortgage-backed securities | 112 |  |  | 1 |  |  | — |  |  | 113 |
Corporate notes and bonds | 762 |  |  | 9 |  |  | (1 | ) |  | 770 |
Municipal securities | 17 |  |  | — |  |  | — |  |  | 17 |
Marketable securities | 1,513 |  |  | 14 |  |  | (1 | ) |  | 1,526 |
Total | $ | 1,594 |  |  | $ | 14 |  |  | $ | (1 | ) |  | $ | 1,607 |
December 31, 2015 | Cost Basis |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Cash | $ | 4 |  |  | $ | — |  |  | $ | — |  |  | $ | 4 |
Cash equivalents | 69 |  |  | — |  |  | — |  |  | 69 |
Cash and cash equivalents | 73 |  |  | — |  |  | — |  |  | 73 |
U.S. government and agency securities | 254 |  |  | — |  |  | (1 | ) |  | 253 |
Foreign government bonds | 31 |  |  | — |  |  | — |  |  | 31 |
Asset-backed securities | 130 |  |  | — |  |  | — |  |  | 130 |
Mortgage-backed securities | 117 |  |  | — |  |  | (1 | ) |  | 116 |
Corporate notes and bonds | 711 |  |  | 1 |  |  | (4 | ) |  | 708 |
Municipal securities | 17 |  |  | — |  |  | — |  |  | 17 |
Marketable securities | 1,260 |  |  | 1 |  |  | (6 | ) |  | 1,255 |
Total | $ | 1,333 |  |  | $ | 1 |  |  | $ | (6 | ) |  | $ | 1,328 |
Schedule of Realized Gain (Loss) | Activity for marketable securities (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Proceeds from sales and maturities | $ | 217 |  |  | $ | 417 |  |  | $ | 357 |  |  | $ | 676 |
Gross realized gains | 2 |  |  | 1 |  |  | 2 |  |  | 2 |
Gross realized losses | (1 | ) |  | (1 | ) |  | (1 | ) |  | (2 | )
Schedule of Debt Investment Maturities | Maturities for marketable securities (in millions):
June 30, 2016 | Cost Basis |  | Fair Value
Due in one year or less | $ | 363 |  |  | $ | 363 |
Due after one year through five years | 1,134 |  |  | 1,147 |
Due after five years through 10 years | 16 |  |  | 16 |
Due after 10 years | — |  |  | — |
Total | $ | 1,513 |  |  | $ | 1,526 |

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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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