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Income per Share (Tables)
12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Weighted Average Common Shares Outstanding
A reconciliation of the number of shares used for the basic and diluted income per share calculations is as follows:
 
Years ended December 31,
Shares in millions
2019
 
2018
 
2017
Basic weighted average common shares outstanding
141

 
140

 
141

Stock options, restricted shares, and convertible debt
1

 
1

 

Diluted weighted average common shares outstanding
142

 
141

 
141