Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - 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, 2017		247.6
Beginning Balance at Dec. 31, 2017	$ 5,140	$ 5,777	$ 2,795	$ (3,497)	$ 65
Increase (Decrease) in Shareholders' Equity
Net income	610		594		16
Shares issued - employee stock compensation plans (in shares)		1.5
Shares issued - employee stock compensation plans	(109)	$ (109)
Shares purchased (in shares)		(3.9)
Shares purchased	(553)		(553)
Share-based compensation expense	77	$ 77
Dividends to shareholders	(89)		(89)
Net change in fair value of financial instruments	14			14
Net foreign currency translation adjustments	247			244	3
Net postretirement benefit obligation	48			48
Ending Balance (in shares) at Mar. 31, 2018		245.2
Ending Balance at Mar. 31, 2018	5,385	$ 5,745	2,747	(3,191)	84
Beginning Balance (in shares) at Dec. 31, 2017		247.6
Beginning Balance at Dec. 31, 2017	5,140	$ 5,777	2,795	(3,497)	65
Increase (Decrease) in Shareholders' Equity
Net income	821
Net change in fair value of financial instruments	14
Net foreign currency translation adjustments	(263)
Net postretirement benefit obligation	108
Ending Balance (in shares) at Sep. 30, 2018		241.2
Ending Balance at Sep. 30, 2018	4,328	$ 5,852	2,042	(3,632)	66
Beginning Balance (in shares) at Mar. 31, 2018		245.2
Beginning Balance at Mar. 31, 2018	5,385	$ 5,745	2,747	(3,191)	84
Increase (Decrease) in Shareholders' Equity
Net income	58		48		10
Shares issued - employee stock compensation plans (in shares)		0.6
Shares issued - employee stock compensation plans	(41)	$ (41)
Shares purchased (in shares)		(2.8)
Shares purchased	(402)		(402)
Share-based compensation expense	70	$ 70
Dividends to shareholders	(98)		(98)
Net change in fair value of financial instruments	(1)			(1)
Net foreign currency translation adjustments	(460)			(454)	(6)
Net postretirement benefit obligation	122			122
Purchases of shares from noncontrolling interests	(1)				(1)
Dividends paid to noncontrolling interests on subsidiary common stock	(14)				(14)
Ending Balance (in shares) at Jun. 30, 2018		243.0
Ending Balance at Jun. 30, 2018	4,618	$ 5,774	2,295	(3,524)	73
Increase (Decrease) in Shareholders' Equity
Net income	153		147		6
Shares issued - employee stock compensation plans (in shares)		0.3
Shares issued - employee stock compensation plans	10	$ 11	(1)
Shares purchased (in shares)		(2.1)
Shares purchased	(301)		(301)
Share-based compensation expense	67	$ 67
Dividends to shareholders	(98)		(98)
Net change in fair value of financial instruments	1			1
Net foreign currency translation adjustments	(50)			(47)	(3)
Net postretirement benefit obligation	(62)			(62)
Dividends paid to noncontrolling interests on subsidiary common stock	(10)				(10)
Ending Balance (in shares) at Sep. 30, 2018		241.2
Ending Balance at Sep. 30, 2018	$ 4,328	$ 5,852	2,042	(3,632)	66
Beginning Balance (in shares) at Dec. 31, 2018	240.1	240.1
Beginning Balance at Dec. 31, 2018	$ 4,219	$ 5,967	2,093	(3,909)	68
Increase (Decrease) in Shareholders' Equity
Net income	676		659		17
Shares issued - employee stock compensation plans (in shares)		1.4
Shares issued - employee stock compensation plans	(96)	$ (96)
Shares purchased (in shares)		(0.6)
Shares purchased	(101)		(101)
Share-based compensation expense	89	$ 89
Dividends to shareholders	(96)		(96)
Net change in fair value of financial instruments	7			7
Net foreign currency translation adjustments	133			131	2
Net postretirement benefit obligation	31			31
Ending Balance (in shares) at Mar. 31, 2019		240.9
Ending Balance at Mar. 31, 2019	$ 4,862	$ 5,960	2,555	(3,740)	87
Beginning Balance (in shares) at Dec. 31, 2018	240.1	240.1
Beginning Balance at Dec. 31, 2018	$ 4,219	$ 5,967	2,093	(3,909)	68
Increase (Decrease) in Shareholders' Equity
Net income	1,191
Net change in fair value of financial instruments	(3)
Net foreign currency translation adjustments	(182)
Net postretirement benefit obligation	$ 62
Ending Balance (in shares) at Sep. 30, 2019	234.1	234.1
Ending Balance at Sep. 30, 2019	$ 3,561	$ 6,086	1,436	(4,030)	69
Beginning Balance (in shares) at Mar. 31, 2019		240.9
Beginning Balance at Mar. 31, 2019	4,862	$ 5,960	2,555	(3,740)	87
Increase (Decrease) in Shareholders' Equity
Net income	287		277		10
Shares issued - employee stock compensation plans (in shares)		0.6
Shares issued - employee stock compensation plans	(47)	$ (47)
Shares purchased (in shares)		(5.8)
Shares purchased	(1,056)		(1,056)
Share-based compensation expense	91	$ 91
Dividends to shareholders	(107)		(107)
Net change in fair value of financial instruments	(8)			(8)
Net foreign currency translation adjustments	(103)			(103)
Net postretirement benefit obligation	14			14
Dividends paid to noncontrolling interests on subsidiary common stock	(20)				(20)
Ending Balance (in shares) at Jun. 30, 2019		235.7
Ending Balance at Jun. 30, 2019	3,913	$ 6,004	1,669	(3,837)	77
Increase (Decrease) in Shareholders' Equity
Net income	228		222		6
Shares issued - employee stock compensation plans (in shares)		0.2
Shares issued - employee stock compensation plans	9	$ 10	(1)
Shares purchased (in shares)		(1.8)
Shares purchased	(350)		(350)
Share-based compensation expense	72	$ 72
Dividends to shareholders	(104)		(104)
Net change in fair value of financial instruments	(2)			(2)
Net foreign currency translation adjustments	(212)			(208)	(4)
Net postretirement benefit obligation	17			17
Dividends paid to noncontrolling interests on subsidiary common stock	$ (10)				(10)
Ending Balance (in shares) at Sep. 30, 2019	234.1	234.1
Ending Balance at Sep. 30, 2019	$ 3,561	$ 6,086	$ 1,436	$ (4,030)	$ 69