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Employee Equity Incentive Plans (Tables)
 9 Months Ended
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