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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2016
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Income tax expense included in our accompanying consolidated statements of income were as follows (in millions, except percentages): 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Income tax expense
$
213

 
$
189

 
$
367

 
$
413

Effective tax rate
36.2
%
 
35.6
%
 
34.8
%
 
35.2
%