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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Schedule of Share Repurchases
Share Repurchases

Year
 
Number of Shares Repurchased
 
Total Payments
(in millions)
 
Average Price Paid Per Share
2014
 
24,413,781

 
$
590

 
$
24.17

2015
 
20,995,419

 
$
555

 
$
26.43

2016
 
10,721,248

 
$
306

 
$
28.53

2017 (through February 23, 2017 on a settlement date basis)
 
3,591,369

 
$
142

 
$
39.65