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Note 9 - Investments - Investments (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2016 | May 31, 2016 | Dec. 31, 2015
Parent Company [Member] | Dow Corning Corporation [Member] |  |  |  |
Ownership interest | [1] | 50.00% |  |
Equity Method Investment, Ownership Percentage | [1] | 50.00% |  |
Parent Company [Member] | All Other [Member] |  |  |  |
Ownership interest, minimum | [1] | 20.00% |  |
Ownership interest, maximum | [1] | 50.00% |  |
Parent Company [Member] | HSG [Member] | Other Liabilities [Member] |  |  |  |
Ownership interest | [2],[3] | 50.00% |  |
Equity Method Investment, Ownership Percentage | [2],[3] | 50.00% |  |
Dow Corning Corporation [Member] |  |  |  |
Ownership interest |  |  | 50.00% |
Equity Method Investments | [1] |  |  | $ 1,483
Investment, amount | [1] |  |  | 1,483
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
All Other [Member] |  |  |  |
Equity Method Investments | [1] | 279 |  | 422
Investment, amount | [1] | 279 |  | 422
HSG [Member] | Other Liabilities [Member] |  |  |  |
HSG (2)(3) | [2],[3] | 361 |  |
Equity Method Investments |  | 279 | $ 4,800 | 1,905
Investment, amount |  | 279 | $ 4,800 | 1,905
Other investments |  | 67 |  | 70
Investment assets |  | 346 |  | 1,975
HSG (2)(3) |  | $ 361 |  |
[1] | Amounts reflect Corning’s direct ownership interests in the respective affiliated companies at June 30, 2016 and December 31, 2015. Corning does not control any of such entities.
[2] | HSG indirectly holds an 80.5% interest in the HSC operating partnership.
[3] | The negative carrying value of the investment in HSG was reduced by $22 million due to equity earnings recognized for the month of June, 2016.

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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