Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Ordinary Shares and Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss, Net of Tax	Non-controlling Interests
Beginning Balance (in shares) at Dec. 31, 2015		269.8
Beginning Balance at Dec. 31, 2015	$ 6,059	$ 5,412	$ 4,013	$ (3,423)	$ 57
Increase (Decrease) in Shareholders' Equity
Net income	1,430		1,396		34
Shares issued - employee stock compensation plans (in shares)		4.3
Shares issued — employee stock compensation plans	(125)	$ (125)
Shares purchased (in shares)		(12.1)
Shares purchased	(1,257)		(1,257)
Tax benefit — employee benefit plans	(4)	$ (4)
Share-based compensation expense	331	331
Dividends to shareholders ($1.56 per share)	(345)		(345)
Change in fair value of financial instruments	(12)			(12)
Net foreign currency translation adjustments	(495)			(493)	(2)
Net postretirement benefit obligation	16			16
Net purchases of shares from noncontrolling interests	(38)	$ (34)			(4)
Dividends paid to noncontrolling interests on subsidiary common stock	(28)				(28)
Ending Balance (in shares) at Dec. 31, 2016		262.0
Ending Balance at Dec. 31, 2016	5,532	$ 5,580	3,807	(3,912)	57
Increase (Decrease) in Shareholders' Equity
Net income	1,263		1,226		37
Shares issued - employee stock compensation plans (in shares)		3.6
Shares issued — employee stock compensation plans	(121)	$ (120)	(1)
Shares purchased (in shares)		(18.0)
Shares purchased	(2,415)		(2,415)
Share-based compensation expense	321	$ 321
Dividends to shareholders ($1.56 per share)	(364)		(364)
Change in fair value of financial instruments	12			12
Net foreign currency translation adjustments	390			385	5
Net postretirement benefit obligation	19			19
Net purchases of shares from noncontrolling interests	(11)	$ (4)			(7)
Dividends paid to noncontrolling interests on subsidiary common stock	$ (27)				(27)
Ending Balance (in shares) at Dec. 31, 2017	247.6	247.6
Ending Balance at Dec. 31, 2017	$ 4,648	$ 5,777	2,302	(3,496)	65
Increase (Decrease) in Shareholders' Equity
Net income	1,174		1,134		40
Shares issued - employee stock compensation plans (in shares)		2.5
Shares issued — employee stock compensation plans	(148)	$ (148)	0
Shares purchased (in shares)		(10.0)
Shares purchased	(1,454)		(1,454)
Share-based compensation expense	338	$ 338
Dividends to shareholders ($1.56 per share)	(382)		(382)
Change in fair value of financial instruments	11			11
Net foreign currency translation adjustments	(444)			(440)	(4)
Net postretirement benefit obligation	17			17
Net purchases of shares from noncontrolling interests	(1)	$ 0			(1)
Dividends paid to noncontrolling interests on subsidiary common stock	$ (32)				(32)
Ending Balance (in shares) at Dec. 31, 2018	240.1	240.1
Ending Balance at Dec. 31, 2018	$ 4,219	$ 5,967	$ 2,093	$ (3,909)	$ 68