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Stock Inventive and Ownership Plans Employee Stock Purchase Plan (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] | Information related to shares issued or to be issued in connection with the employee stock purchase plan based on employee contributions and the range of purchase prices is as follows:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Shares issued or to be issued (in thousands) | 2,196 |  |  | 2,452 |  |  | 2,491 |
Range of purchase prices | $ | 29.29 |  | - | $36.47 |  | $ | 21.49 |  | - | $27.91 |  | $ | 18.60 |  | - | $21.07
Expense recognized (in millions) | $ | 19 |  |  | $ | 17 |  |  | $ | 13 |

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- Definition Tabular disclosure of employee stock purchase plan activity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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