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Note 13 - Employee Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Note 13 - Employee Retirement Plans (Tables) [Line Items]  
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]
 
Total
pension benefits
 
Domestic
pension benefits
 
International
pension benefits
December 31,
2015
 
2014
 
2015
 
2014
 
2015
 
2014
                                   
Change in benefit obligation
                                 
Benefit obligation at beginning of year
$
3,809 
 
$
3,300 
 
$
3,222 
 
$
2,844 
 
$
587 
 
$
456 
Service cost
 
90 
   
82 
   
64 
   
55 
   
26 
   
27 
Interest cost
 
144 
   
160 
   
126 
   
137 
   
18 
   
23 
Plan participants’ contributions
 
1 
   
1 
   
1 
   
1 
           
Acquisitions
       
103 
                     
103 
Amendments
       
25 
         
25 
           
Actuarial (gain) loss
 
(95)
   
394 
   
(87)
   
327 
   
(8)
   
67 
Other
 
(8)
   
(3)
               
(8)
   
(3)
Benefits paid
 
(188)
   
(207)
   
(165)
   
(167)
   
(23)
   
(40)
Foreign currency translation
 
(38)
   
(46)
               
(38)
   
(46)
Benefit obligation at end of year
$
3,715 
 
$
3,809 
 
$
3,161 
 
$
3,222 
 
$
554 
 
$
587 
                                   
Change in plan assets
                                 
Fair value of plan assets at beginning of year
$
3,263 
 
$
2,896 
 
$
2,814 
 
$
2,596 
 
$
449 
 
$
300 
Actual (loss) gain on plan assets
 
(108)
   
355 
   
(111)
   
287 
   
3 
   
68 
Employer contributions
 
116 
   
147 
   
77 
   
97 
   
39 
   
50 
Plan participants’ contributions
 
1 
   
1 
   
1 
   
1 
           
Acquisitions
       
97 
                     
97 
Benefits paid
 
(188)
   
(207)
   
(165)
   
(167)
   
(23)
   
(40)
Foreign currency translation
 
(26)
   
(26)
               
(26)
   
(26)
Fair value of plan assets at end of year
$
3,058 
 
$
3,263 
 
$
2,616 
 
$
2,814 
 
$
442 
 
$
449 
                                   
Funded status at end of year
                                 
Fair value of plan assets
$
3,058 
 
$
3,263 
 
$
2,616 
 
$
2,814 
 
$
442 
 
$
449 
Benefit obligations
 
(3,715)
   
(3,809)
   
(3,161)
   
(3,222)
   
(554)
   
(587)
Funded status of plans
$
(657)
 
$
(546)
 
$
(545)
 
$
(408)
 
$
(112)
 
$
(138)
                                   
Amounts recognized in the consolidated balance sheets consist of:
                                 
Noncurrent asset
$
50 
 
$
47 
             
$
50 
 
$
47 
Current liability
 
(35)
   
(41)
 
$
(30)
 
$
(30)
   
(5)
   
(11)
Noncurrent liability
 
(672)
   
(552)
   
(515)
   
(378)
   
(157)
   
(174)
Recognized liability
$
(657)
 
$
(546)
 
$
(545)
 
$
(408)
 
$
(112)
 
$
(138)
                                   
Amounts recognized in accumulated other comprehensive income consist of:
                                 
Net actuarial loss 
$
332 
 
$
308 
 
$
305 
 
$
278 
 
$
27 
 
$
30 
Prior service cost (credit)
 
35 
   
41 
   
37 
   
44 
   
(2)
   
(3)
Amount recognized at end of year 
$
367 
 
$
349 
 
$
342 
 
$
322 
 
$
25 
 
$
27 
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
 
December 31,
 
2015
 
2014
           
Projected benefit obligation
$
3,341
 
$
3,425
Fair value of plan assets
$
2,635
 
$
2,831
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
 
December 31,
 
2015
 
2014
           
Accumulated benefit obligation
$
3,159
 
$
479
Fair value of plan assets
$
2,634
 
$
17
Schedule of Net Benefit Costs [Table Text Block]
 
Total pension benefits
 
Domestic pension benefits
 
International pension benefits
December 31,
2015
 
2014
 
2013
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
                                   
Service cost
$  90 
 
$  82 
 
$   70 
 
$  64 
 
$  55 
 
$  60 
 
$26 
 
$ 27 
 
$10 
Interest cost
144 
 
160 
 
131 
 
126 
 
137 
 
115 
 
18 
 
23 
 
16 
Expected return on plan assets 
(178)
 
(174)
 
(169)
 
(166)
 
(159)
 
(158)
 
(12)
 
(15)
 
(11)
Amortization of prior service cost (credit)
6 
 
6 
 
5 
 
7 
 
7 
 
6 
 
(1)
 
(1)
 
(1)
Recognition of actuarial loss (gain)
165 
 
29 
 
(30)
 
162 
 
4 
 
(41)
 
3 
 
25 
 
11 
Total net periodic benefit expense
$227 
 
$103 
 
$     7 
 
$193 
 
$  44 
 
$ (18)
 
$34 
 
$ 59 
 
$25 
                                   
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
                                 
Curtailment effects
   
$  (3)
                     
$  (3)
   
Settlements
$  (1)
 
(2)
                 
$(1)
 
(2)
   
Current year actuarial loss (gain)
191 
 
212 
 
$(264)
 
$189 
 
$198 
 
$(274)
 
2 
 
14 
 
$10 
Recognition of actuarial (loss) gain
(165)
 
(29)
 
30 
 
(162)
 
(4)
 
41 
 
(3)
 
(25)
 
(11)
Current year prior service cost
   
25 
         
25 
               
Amortization of prior service (cost) credit
(6)
 
(6)
 
(5)
 
(7)
 
(7)
 
(6)
 
1 
 
1 
 
1 
Total recognized in other comprehensive (income) loss 
$  19 
 
$197 
 
$(239)
 
$  20 
 
$212 
 
$(239)
 
$(1)
 
$(15)
 
$  0 
                                   
Total recognized in net periodic benefit cost and other comprehensive (income) loss 
$246 
 
$300 
 
$(232)
 
$213 
 
$256 
 
$(257)
 
$33 
 
$ 44 
 
$25 
Schedule of Assumptions Used [Table Text Block]
 
Pension benefits
   
 
Domestic
 
International
 
Postretirement benefits
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Discount rate
4.24%
 
4.00%
 
4.75%
 
3.23%
 
3.21%
 
4.08%
 
4.31%
 
4.00%
 
4.75%
Rate of compensation increase
3.50%
 
3.50%
 
4.00%
 
3.92%
 
3.88%
 
3.85%
           
 
Pension benefits
   
 
Domestic
 
International
 
Postretirement benefits
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Discount rate
4.00%
 
4.75%
 
3.75%
 
3.21%
 
4.08%
 
4.48%
 
4.00%
 
4.75%
 
4.00%
Expected return on plan assets
6.00%
 
6.25%
 
6.00%
 
2.97%
 
4.12%
 
3.73%
           
Rate of compensation increase
3.50%
 
4.00%
 
4.00%
 
3.88%
 
3.85%
 
3.45%
           
Schedule of Health Care Cost Trend Rates [Table Text Block]
Assumed health care trend rates at December 31
2015
 
2014
Health care cost trend rate assumed for next year
7%
 
6.67%
Rate that the cost trend rate gradually declines to
5%
 
5%
Year that the rate reaches the ultimate trend rate
2024
 
2020
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
 
One-percentage-point
increase
 
One-percentage-point
decrease
Effect on annual total of service and interest cost
$  4
 
$  (3)
Effect on postretirement benefit obligation
$52
 
$(43)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
 
Level 3 Roll-Forward – Other Assets
(in millions)
2015
 
2014
       
Beginning balance
$445
 
$196
Unrealized gains (loss) 
    13
 
  249
Transfer in (out) of level 3
  (212)
   
Ending balance
$246
 
$445
Schedule of Expected Benefit Payments [Table Text Block]
 
Expected benefit payments
   
 
Domestic
pension
benefits
 
International
pension
benefits
Postretirement
benefits
 
Expected federal subsidy payments
postretirement benefits
2016
$   192
 
$  18
$  45
 
$  2
2017
$   178
 
$  22
$  44
 
$  3
2018
$   186
 
$  24
$  44
 
$  3
2019
$   192
 
$  25
$  44
 
$  3
2020
$   198
 
$  29
$  46
 
$  3
2021-2025
$1,100
 
$168
$230
 
$16
Pension Plan [Member]  
Note 13 - Employee Retirement Plans (Tables) [Line Items]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
 
Level 3 assets – Domestic
 
Level 3 assets – International
 
Year ended December 2015
 
Year ended December 2015
(in millions)
Private
equity
 
Real
estate
 
Mortgages
 
Insurance
contracts
                     
Beginning balance at December 31, 2014
$
192 
 
$
84 
 
$
7 
 
$
5 
                       
Actual return on plan assets relating to assets still held at the reporting date
 
16 
   
12 
           
Transfers in and/or out of level 3
 
(45)
   
(35)
   
(5)
   
(2)
Ending balance at December 31, 2015
$
163 
 
$
61 
 
$
2 
 
$
3 
 
Level 3 assets – Domestic
 
Level 3 assets – International
 
Year ended December 2014
 
Year ended December 2014
(in millions)
Private
equity
 
Real
estate
 
Mortgages
 
Insurance
contracts
                     
Beginning balance at December 31, 2013
$
207 
 
$
93 
 
$
0
 
$
6 
                       
Actual return on plan assets relating to assets still held at the reporting date
 
31 
   
8 
         
1 
Transfers in and/or out of level 3
 
(46)
   
(17)
   
7
   
(2)
Ending balance at December 31, 2014
$
192 
 
$
84 
 
$
7
 
$
5 
Other Postretirement Benefit Plan [Member]  
Note 13 - Employee Retirement Plans (Tables) [Line Items]  
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]
 
Postretirement benefits
December 31,
2015
 
2014
           
Change in benefit obligation
         
Benefit obligation at beginning of year
$
862 
 
$
815 
Service cost
 
13 
   
11 
Interest cost
 
33 
   
38 
Plan participants’ contributions
 
7 
   
7 
Amendments
       
(5)
Actuarial (gain) loss
 
(97)
   
49 
Other
 
4 
     
Benefits paid
 
(61)
   
(56)
Medicare subsidy received
 
2 
   
3 
Foreign currency translation
         
Benefit obligation at end of year
$
763 
 
$
862 
           
Funded status at end of year
         
Fair value of plan assets
$
0 
 
$
0 
Benefit obligations
 
(763)
   
(862)
Funded status of plans
$
(763)
 
$
(862)
           
Amounts recognized in the consolidated balance sheets consist of:
         
Current liability
$
(45)
 
$
(48)
Noncurrent liability
 
(718)
   
(814)
Recognized liability
$
(763)
 
$
(862)
           
Amounts recognized in accumulated other comprehensive income consist of:
         
Net actuarial loss 
$
33 
 
$
132 
Prior service credit
 
(19)
   
(27)
Amount recognized at end of year 
$
14 
 
$
105 
Schedule of Net Benefit Costs [Table Text Block]
 
Postretirement benefits
 
2015
 
2014
 
2013
                 
Service cost
$
13 
 
$
11 
 
$
13 
Interest cost
 
33 
   
38 
   
39 
Amortization of net loss 
 
3 
         
15 
Amortization of prior service credit
 
(7)
   
(6)
   
(6)
Total net periodic benefit expense 
$
42 
 
$
43 
 
$
61 
                 
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
               
Current year actuarial (gain) loss
$
(96)
 
$
49 
 
$
(178)
Amortization of actuarial loss 
 
(3)
         
(15)
Current year prior service credit
       
(5)
   
(5)
Amortization of prior service credit
 
7 
   
6 
   
6 
Total recognized in other comprehensive (income) loss 
$
(92)
 
$
50 
 
$
(192)
                 
Total recognized in net periodic benefit cost and other comprehensive (income) loss 
$
(50)
 
$
93 
 
$
(131)
United States Pension Plan of US Entity [Member]  
Note 13 - Employee Retirement Plans (Tables) [Line Items]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
     
Fair value measurements at reporting date using
(in millions)
December 31,
2015
 
Quoted prices in
active markets
for identical
assets (Level 1)
 
Significant
other
observable
inputs (Level 2)
 
Significant
unobservable
inputs
(Level 3)
Equity securities:
                     
U.S. companies
$
336
 
$
51
 
$
285
     
International companies
 
322
   
79
   
243
     
                       
Fixed income:
                     
U.S. corporate bonds
 
1,566
   
158
   
1,408
     
                       
Private equity (1)
 
163
             
$
163
Real estate (2)
 
61
               
61
Cash equivalents
 
71
   
71
           
Commodities (3)
 
97
         
97
     
Total
$
2,616
 
$
359
 
$
2,033
 
$
224
     
Fair value measurements at reporting date using
(in millions)
December 31,
2014
 
Quoted prices in
active markets
for identical
assets (Level 1)
 
Significant
other
observable
inputs (Level 2)
 
Significant
unobservable
inputs
(Level 3)
Equity securities:
                     
U.S. companies
$
310
 
$
49
 
$
261
     
International companies
 
327
   
78
   
249
     
                       
Fixed income:
                     
U.S. corporate bonds
 
1,720
   
166
   
1,554
     
                       
Private equity (1)
 
192
             
$
192
Real estate (2)
 
84
               
84
Cash equivalents
 
80
   
80
           
Commodities (3)
 
101
         
101
     
Total
$
2,814
 
$
373
 
$
2,165
 
$
276
Foreign Pension Plan [Member]  
Note 13 - Employee Retirement Plans (Tables) [Line Items]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
     
Fair value measurements at reporting date using
(in millions)
December 31,
2015
 
Quoted prices in
active markets
for identical
assets (Level 1)
 
Significant
other
observable
inputs (Level 2)
 
Significant
unobservable
inputs
(Level 3)
Equity securities:
                     
U.S. companies
$
7
       
$
7
     
International companies
 
23
         
23
     
                       
Fixed income:
                     
International fixed income
 
347
 
$
286
   
61
     
                       
Insurance contracts
 
3
             
$
3
Mortgages
 
2
               
2
Cash equivalents
 
60
   
60
           
Total
$
442
 
$
346
 
$
91
 
$
5
     
Fair value measurements at reporting date using
(in millions)
December 31,
2014
 
Quoted prices in
active markets
for identical
assets (Level 1)
 
Significant
other
observable
inputs (Level 2)
 
Significant
unobservable
inputs
(Level 3)
Equity securities:
                     
U.S. companies
$
6
       
$
6
     
International companies
 
22
         
22
     
                       
Fixed income:
                     
International fixed income
 
361
 
$
293
   
68
     
                       
Insurance contracts
 
5
             
$
5
Mortgages
 
7
               
7
Cash equivalents
 
48
   
48
           
Total
$
449
 
$
341
 
$
96
 
$
12