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Note 20 - Reportable Segments (Details) - Reconciliation of Reportable Segment Net Income (Loss) to Consolidated Net Income - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ 224 | $ 212 | $ 496 | $ 407 | $ 988 | $ 1,014 | $ 169 | $ 301 | $ 1,339 | $ 2,472 | $ 1,961
Unallocated amounts: |  |  |  |  |  |  |  |  |  |  |  |
Net financing costs (1) | [1] |  |  |  |  |  |  |  |  | (111) | (113) | (66)
Share-based compensation expense |  |  |  |  |  |  |  |  |  | (46) | (58) | (54)
Exploratory research |  |  |  |  |  |  |  |  |  | (109) | (102) | (112)
Corporate contributions |  |  |  |  |  |  |  |  |  | (52) | (43) | (42)
Equity in earnings of affiliated companies, net of impairments (2) | [2] |  |  |  |  |  |  |  |  | 291 | 269 | 207
Unrealized (loss) gain on foreign currency hedges related to translated earnings |  |  |  |  |  |  |  |  |  | (573) | 1,095 | 368
Income tax benefit (provision) |  |  |  |  |  |  |  |  |  | 568 | (267) | (1)
Other corporate items |  |  |  |  |  |  |  |  |  | (148) | (84) | (32)
Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 1,721 | 1,973 | 1,858
Non Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | $ (202) | $ (198) | $ (165)
[1] | Net financing costs include interest income, interest expense, and interest costs and investment gains and losses associated with benefit plans.
[2] | Primarily represents the equity earnings of Dow Corning.

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