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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of reconciliations of the numerators and denominators used in the computations of basic and diluted earnings per common share
Reconciliations of the numerators and denominators used in the computations of basic and diluted earnings per common share were as follows, in millions: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Numerator (basic and diluted):
 

 
 

 
 

 
 

Net income
$
148

 
$
134

 
$
446

 
$
393

Less: Allocation to unvested restricted stock awards
1

 
2

 
4

 
5

Net income available to common shareholders
$
147

 
$
132

 
$
442

 
$
388

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 

 
 

Basic common shares (based upon weighted average)
313

 
326

 
315

 
328

Add: Stock option dilution
3

 
3

 
4

 
4

Diluted common shares
316

 
329

 
319

 
332