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Equity Level 3 (Table) (Tables)
 9 Months Ended
Sep. 30, 2016
Equity [Abstract]  
Class of Treasury Stock [Table Text Block]
Equity Repurchase Activity and Remaining Repurchase Capacity
Three months ended
Common Shares
Repurchased
Cost of Shares Repurchased
Average Price Paid per Share
Remaining Capacity Under Share Repurchase Authorization
(In millions, except for per share data)
 
 
 
 
March 31, 2017
6.7

$
325

$
48.47

$
975

June 30, 2017
6.6

$
325

$
49.34

$
650

September 30, 2017
6.0

$
325

$
54.35

$
325

Total
19.3

$
975