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Note 3. Earnings Per Common Share ("EPS") Earnings Per Common Share ("EPS") (Tables) | 9 Months Ended
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Sep. 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 |  | $ | 454 |  |  | $ | 418 |  |  | $ | 1,208 |  |  | $ | 904 |
Weighted-average common shares outstanding (for basic calculation) |  | 318 |  |  | 345 |  |  | 325 |  |  | 351 |
Effect of dilutive share-based employee compensation |  | 7 |  |  | 8 |  |  | 7 |  |  | 7 |
Weighted-average common and dilutive potential common shares outstanding (for diluted calculation) |  | 325 |  |  | 353 |  |  | 332 |  |  | 358 |
Basic EPS |  | $ | 1.43 |  |  | $ | 1.21 |  |  | $ | 3.72 |  |  | $ | 2.58 |
Diluted EPS |  | $ | 1.40 |  |  | $ | 1.18 |  |  | $ | 3.64 |  |  | $ | 2.52 |
Unexercised employee stock options and stock appreciation rights (in millions) excluded from the diluted EPS computation(a) |  | 2.2 |  |  | 1.9 |  |  | 1.9 |  |  | 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.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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