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Employee Stock-based Compensation Plans Stock-Based Compensation Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock options   $ 12 $ 13 $ 14
Restricted shares   41 33 32
Employee share repurchase program   3 4 3
Total stock-based compensation before income taxes   56 50 49
Tax benefit   (17) (16) (16)
Total stock-based compensation, net of tax $ 1 $ 39 $ 34 $ 33