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Note 3. Earnings Per Common Share ("EPS") Earnings Per Common Share ("EPS") (Tables)
 3 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
Quarter ended
 
Year to date
 
 
2018
 
2017
 
2018
 
2017
Net Income
 
$
321

 
$
206

 
$
754

 
$
486

 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding (for basic calculation)
 
324


350

 
328

 
354

Effect of dilutive share-based employee compensation
 
7

 
8

 
8

 
7

Weighted-average common and dilutive potential common shares outstanding (for diluted calculation)
 
331


358

 
336


361

 
 
 
 
 
 
 
 
 
Basic EPS
 
$
0.99

 
$
0.59

 
$
2.30

 
$
1.37

 
 
 
 
 
 
 
 
 
Diluted EPS
 
$
0.97

 
$
0.58

 
$
2.25

 
$
1.34

Unexercised employee stock options and stock appreciation rights (in millions) excluded from the diluted EPS computation(a)
 
2.3

 
2.7

 
1.8

 
2.3


(a)
These unexercised employee stock options and stock appreciation rights were not included in the computation of diluted EPS because to do so would have been antidilutive for the periods presented.