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Restructuring - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 21 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Employee Severance [Member]
Sep. 30, 2012
Employee Severance [Member]
Sep. 30, 2013
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]              
Pre-tax restructuring charges $ 3 $ 44 $ 13 $ 51      
Pre-tax restructuring charges associated with this reorganization related to employee severance and benefit costs         6 46  
Employee severance and benefit costs from restructurings beginning in 2012             62
Employee severance and benefit cost payments through the balance sheet date             53
Remaining employee severance payable through our restructuring efforts         $ 6   $ 6
Completion date of restructuring activities             Dec. 31, 2014