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Note 13 - Employee Retirement Plans (Details) - Domestic 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

United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

2,616

2,814

2,596

Private Equity Funds [Member]

Equity securities:

Fair value of plan assets

163

192

207

Private Equity Funds [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

^[1]

163

192

Real Estate [Member]

Equity securities:

Fair value of plan assets

61

84

$ 93

Real Estate [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

^[2]

61

84

Cash Equivalents [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

71

80

Commodity Option [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

^[3]

97

101

U.S. Companies [Member] | Equity Securities [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

336

310

U.S. Companies [Member] | Fixed Income Securities [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

1,566

1,720

International Companies [Member] | Equity Securities [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

322

327

Fair Value, Inputs, Level 1 [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

359

373

Fair Value, Inputs, Level 1 [Member] | Cash Equivalents [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

71

80

Fair Value, Inputs, Level 1 [Member] | U.S. Companies [Member] | Equity Securities [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

51

49

Fair Value, Inputs, Level 1 [Member] | U.S. Companies [Member] | Fixed Income Securities [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

158

166

Fair Value, Inputs, Level 1 [Member] | International Companies [Member] | Equity Securities [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

79

78

Fair Value, Inputs, Level 2 [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

2,033

2,165

Fair Value, Inputs, Level 2 [Member] | Commodity Option [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

^[3]

97

101

Fair Value, Inputs, Level 2 [Member] | U.S. Companies [Member] | Equity Securities [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

285

261

Fair Value, Inputs, Level 2 [Member] | U.S. Companies [Member] | Fixed Income Securities [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

1,408

1,554

Fair Value, Inputs, Level 2 [Member] | International Companies [Member] | Equity Securities [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

243

249

Fair Value, Inputs, Level 3 [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

224

276

Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

^[1]

163

192

Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] | United States Pension Plan of US Entity [Member]

Equity securities:

Fair value of plan assets

^[2]

$ 61

$ 84

[1]	This category includes venture capital, leverage buyouts and distressed debt limited partnerships invested primarily in U.S. companies. The inputs are valued by discounted cash flow analysis and comparable sale analysis.
[2]	This category includes industrial, office, apartments, hotels, infrastructure and retail investments which are limited partnerships predominately in the U.S. The inputs are valued by discounted cash flow analysis; comparable sale analysis and periodic external appraisals.
[3]	This category includes investments in energy, industrial metals, precious metals, agricultural and livestock primarily through futures, options, swaps and exchange traded funds.

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- Definition

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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