Consolidated Statements of Shareholders' Equity Statement - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Common Stock in Treasury	Employee Benefit Trust
Shares, Beginning Balance at Dec. 31, 2014		1,111,437				810
Shareholders' equity, Beginning Balance at Dec. 31, 2014	$ 15,373.2	$ 694.6	$ 5,292.3	$ 16,482.7	$ (3,991.8)	$ (91.4)	$ (3,013.2)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income (loss)	2,408.4			2,408.4
Other comprehensive income (loss), net of tax	(588.9)				(588.9)
Cash dividends declared	(2,136.0)			(2,136.0)
Retirement of treasury shares, shares		(9,877)				(9,877)
Retirement of treasury shares	0.0	$ (6.2)		(743.3)		$ 749.5
Purchase of treasury shares, shares						9,877
Purchase of treasury shares	(749.5)					$ (749.5)
Issuance of stock under employee stock plans, net, shares		4,503				(14)
Issuance of stock under employee stock plans, net	(46.3)	$ (2.9)	(42.0)			$ (1.4)
Stock-based compensation	217.8		217.8
Shareholders' equity, Ending Balance at Dec. 31, 2015	14,571.3	$ 691.3	5,552.1	16,011.8	(4,580.7)	$ (90.0)	(3,013.2)
Shares, Ending Balance at Dec. 31, 2015		1,106,063				796
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income (loss)	2,737.6			2,737.6
Other comprehensive income (loss), net of tax	(693.3)				(693.3)
Cash dividends declared	(2,167.6)			(2,167.6)
Retirement of treasury shares, shares		(7,306)				(7,306)
Retirement of treasury shares	0.0	$ (4.6)		(535.5)		$ 540.1
Purchase of treasury shares, shares						7,306
Purchase of treasury shares	(600.1)		(60.0)			$ (540.1)
Issuance of stock under employee stock plans, net, shares		2,829				(85)
Issuance of stock under employee stock plans, net	(95.5)	$ (1.8)	106.8			$ (9.5)
Stock-based compensation	255.3		255.3
Shareholders' equity, Ending Balance at Dec. 31, 2016	14,007.7	$ 688.5	5,640.6	16,046.3	(5,274.0)	$ (80.5)	(3,013.2)
Shares, Ending Balance at Dec. 31, 2016		1,101,586				711
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income (loss)	(204.1)			(204.1)
Other comprehensive income (loss), net of tax	199.0				199.0
Cash dividends declared	(2,234.6)			(2,234.6)
Retirement of treasury shares, shares		(4,390)				(4,390)
Retirement of treasury shares	0.0	$ (2.7)		(357.1)		$ 359.8
Purchase of treasury shares, shares						4,390
Purchase of treasury shares	(299.8)		60.0			$ (359.8)
Issuance of stock under employee stock plans, net, shares		3,476				(47)
Issuance of stock under employee stock plans, net	(157.3)	$ (2.1)	164.1			$ (4.7)
Stock-based compensation	281.3		281.3
Shareholders' equity, Ending Balance at Dec. 31, 2017	$ 11,592.2	$ 687.9	$ 5,817.8	13,894.1	(5,718.6)	$ (75.8)	$ (3,013.2)
Shares, Ending Balance at Dec. 31, 2017		1,100,672				664
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Reclassification of stranded tax effects - provisional (Note 2)				$ 643.6	$ (643.6)