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Segment and Geographic Information (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Entity Wide Revenue Major Customer [Line Items]
Total revenues	$ 5,340.2	$ 5,754.6	$ 6,049.7	$ 5,675.9	$ 6,028.9	$ 6,424.1	$ 6,265.0	$ 5,903.9	$ 22,820.4	$ 24,621.9	$ 25,413.0
Total operating income	2,144.2	$ 3,079.4	$ 2,295.1	$ 2,034.0	1,969.0	$ 2,137.3	$ 1,857.9	$ 1,780.3	9,552.7	7,744.5	7,145.5
Total assets	33,803.7				31,023.9				33,803.7	31,023.9	37,938.7
Total capital expenditures									1,853.7	1,821.1	1,813.9
Depreciation and amortization									1,363.4	1,516.5	1,555.7
U.S.
Entity Wide Revenue Major Customer [Line Items]
Total revenues									8,006.4	8,252.7	8,558.9
Total operating income									4,022.4	3,768.7	3,612.0
Total assets	12,648.6				11,960.6				12,648.6	11,960.6	11,806.1
Total capital expenditures									861.2	586.7	533.2
Depreciation and amortization									524.1	510.3	515.2
International Lead Markets [Member]
Entity Wide Revenue Major Customer [Line Items]
Total revenues									7,340.3	7,223.4	7,614.9
Total operating income									3,166.5	2,838.4	2,712.6
Total assets	11,844.3				9,112.5				11,844.3	9,112.5	11,136.3
Total capital expenditures									515.3	635.6	596.1
Depreciation and amortization									461.1	451.6	460.9
High-Growth Markets [Member]
Entity Wide Revenue Major Customer [Line Items]
Total revenues									5,533.2	6,160.7	6,172.8
Total operating income									2,001.4	1,048.8	841.1
Total assets	4,480.7				5,208.6				4,480.7	5,208.6	5,248.6
Total capital expenditures									378.5	493.2	540.5
Depreciation and amortization									231.7	362.0	363.9
Foundational Markets and Corporate [Member]
Entity Wide Revenue Major Customer [Line Items]
Total revenues									1,940.5	2,985.1	3,066.4
Total operating income									362.4	88.6	(20.2)
Total assets	$ 4,830.1				$ 4,742.2				4,830.1	4,742.2	9,747.7
Total capital expenditures									98.7	105.6	144.1
Depreciation and amortization									$ 146.5	$ 192.6	$ 215.7

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