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Fair Value of Financial Investments (Tables) | 3 Months Ended
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Mar. 31, 2016
Fair Value Disclosures [Abstract] |
Schedule of financial investments included in other assets | Financial investments were as follows, in millions:
| March 31, 2016 |  | December 31, 2015
Prepaid expenses and other: |  |  |
Auction rate securities | $ | 12 |  |  | $ | — |
Other assets: |  |  |
Auction rate securities | 10 |  |  | 22 |
Equity method investments | 13 |  |  | 13 |
Private equity funds | 9 |  |  | 10 |
Other investments | 3 |  |  | 3 |
Total | $ | 47 |  |  | $ | 48 |
Schedule of income from financial investments, net, included in other, net, within other income (expense), net, | Income from financial investments, net, included in other, net, within other income (expense), net, was as follows, in millions:
| Three Months Ended March 31,
| 2016 |  | 2015
Realized gains from private equity funds | $ | — |  |  | $ | 2 |
Equity investment income, net | 1 |  |  | — |
Total income from financial investments, net | $ | 1 |  |  | $ | 2 |

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- Definition Tabular disclosure of investment income, including, but not limited to, interest and dividend income and amortization of discount (premium) derived from debt and equity securities. Excludes realized and unrealized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Tabular disclosure of the summary of investment holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 + Details
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