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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Schedule of Share Repurchases
Share Repurchases

Year
 
Number of Shares Repurchased
 
Total Payments
(in millions)
 
Average Price Paid Per Share
2013
 
12,512,759

 
$
264

 
$
21.12

2014
 
24,413,781

 
$
590

 
$
24.17

2015
 
20,995,419

 
$
555

 
$
26.43

2016 (through February 9, 2016 on a settlement date basis)
 
2,258,602

 
$
55

 
$
24.37

Cumulative repurchases since the beginning of 2013
 
60,180,561

 
$
1,464

 
$
24.33