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Income before Provision for Income Taxes, Classified by Source of Income (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
U.S. $ 2,597.8 $ 2,681.9 $ 2,912.7
Outside the U.S. 3,957.9 4,690.1 5,291.8
Income before provision for income taxes $ 6,555.7 $ 7,372.0 $ 8,204.5