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Employee Equity Incentive Plans (Tables) | 9 Months Ended
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Sep. 30, 2017
Employee Benefits and Share-based Compensation, Noncash [Abstract] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | Restricted stock unit activity in the first nine months of 2017 was as follows:
|  | Number of RSUs (In Millions) |  | Weighted Average Grant-Date Fair Value
December 31, 2016 |  | 106.8 |  |  | $ | 28.99 |
Granted |  | 41.1 |  |  | $ | 34.46 |
Assumed in acquisition |  | 1.1 |  |  | $ | 34.90 |
Vested |  | (38.3 | ) |  | $ | 27.33 |
Forfeited |  | (11.1 | ) |  | $ | 29.97 |
September 30, 2017 |  | 99.6 |  |  | $ | 31.84 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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