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Common and Preferred Stock (Tables)
 12 Months Ended
Dec. 31, 2019
Common And Preferred Stock [Abstract]  
Schedule of Share Repurchases
In millions, except per share amounts
 
2019
 
 
2018
 
 
2017
 
Number of shares repurchased
 
 
11.1
 
 
 
5.8
 
 
 
43.0
 
Average price paid per share
 
$
9.12
 
 
$
8.21
 
 
$
7.55
 
Remaining authorization as of December 31
 
$
101
 
 
$
202
 
 
$
250