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Provision for Income Taxes, Classified by Timing and Location of Payment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
U.S. federal $ 2,030.8 $ 1,046.6 $ 1,072.3
U.S. state 169.8 121.3 139.5
Outside the U.S. 1,217.0 1,550.2 816.0
Current tax provision 3,417.6 2,718.1 2,027.8
U.S. federal (120.1) (122.1) 6.8
U.S. state 12.8 14.1 (3.9)
Outside the U.S. 70.9 (430.6) (4.3)
Deferred tax provision (36.4) (538.6) (1.4)
Provision for income taxes $ 3,381.2 $ 2,179.5 $ 2,026.4