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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2010
Jun. 30, 2013
M
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]              
Effective tax rate 30.00%     25.00% 79.00%    
State income tax benefit       $ 11 $ 21    
Income tax expense 39 31   53 38    
Pre-tax loss on continuing operations (131) 12   (210) (48)    
Reduction in the liability for unrecognized tax benefits 3     3      
Time limits for tax audit closings, settlements and expiration of applicable statutes of limitations in various jurisdictions       12      
Deferred tax assets expected to be realized       More than 50 percent      
Increase in tax expense from repatriation of foreign earnings     372        
Increase in tax expense from repatriation of foreign earnings           $ 65 $ 89