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Note 13 - Employee Retirement Plans (Details) - International Defined Benefit Plan Assets - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity securities:
Fair value of plan assets	$ 3,058	$ 3,263	$ 2,896
Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	442	449	300
Insurance Contracts [Member]
Equity securities:
Fair value of plan assets	3	5	6
Insurance Contracts [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	3	5
Collateralized Mortgage Backed Securities [Member]
Equity securities:
Fair value of plan assets	2	7	$ 0
Collateralized Mortgage Backed Securities [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	2	7
Cash Equivalents [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	60	48
U.S. Companies [Member] | Equity Securities [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	7	6
International Companies [Member] | Equity Securities [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	23	22
International Companies [Member] | Fixed Income Securities [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	347	361
Fair Value, Inputs, Level 1 [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	346	341
Fair Value, Inputs, Level 1 [Member] | Cash Equivalents [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	60	48
Fair Value, Inputs, Level 1 [Member] | International Companies [Member] | Fixed Income Securities [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	286	293
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	91	96
Fair Value, Inputs, Level 2 [Member] | U.S. Companies [Member] | Equity Securities [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	7	6
Fair Value, Inputs, Level 2 [Member] | International Companies [Member] | Equity Securities [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	23	22
Fair Value, Inputs, Level 2 [Member] | International Companies [Member] | Fixed Income Securities [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	61	68
Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	5	12
Fair Value, Inputs, Level 3 [Member] | Insurance Contracts [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	3	5
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Backed Securities [Member] | Foreign Pension Plan [Member]
Equity securities:
Fair value of plan assets	$ 2	$ 7

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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