Note 7 - Investments (Details) - Financial Position - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Affiliated Companies [Member]
Note 7 - Investments (Details) - Financial Position [Line Items]
Current assets	$ 5,228	$ 5,432
Noncurrent assets	6,453	6,864
Short-term borrowings, including current portion of long-term debt	6	7
Other current liabilities	1,461	1,630
Long-term debt	800	950
Other long-term liabilities	4,557	5,143
Non-controlling interest	631	634
Balances due from affiliated companies	11	19
Balances due to affiliated companies	1	2
Dow Corning Corporation [Member]
Note 7 - Investments (Details) - Financial Position [Line Items]
Current assets	4,511	4,712
Noncurrent assets	6,064	6,433
Short-term borrowings, including current portion of long-term debt	6	7
Other current liabilities	1,305	1,441
Long-term debt	785	945
Other long-term liabilities	4,539	5,125
Non-controlling interest	$ 631	$ 634