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Basis of Presentation and Principles of Consolidation (Tables)
3 Months Ended
Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Income Tax Provision and Effective Tax Rates
The following table shows our income tax provision and effective tax rates:
 
 
Three Months Ended March 31,
 
Percentage Change
 
 
2017
 
2016
 
2017 vs. 2016
 
 
($ in millions)
 
 
Income tax provision
 
$
48

 
$
63

 
(23.8
)%
Effective tax rate
 
22.1
%
 
32.3
%
 
(10.2
)%