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
Balance (in shares) at Dec. 31, 2014		280.0
Balance at Dec. 31, 2014	$ 6,527	$ 5,100	$ 4,501	$ (3,134)	$ 60
Increase (Decrease) in Shareholders' Equity
Net income	1,422		1,385		37
Shares issued - employee stock compensation plans (in shares)		5.8
Shares issued — employee stock compensation plans	(155)	$ (155)
Shares purchased (in shares)		(16.0)
Shares purchased	(1,550)		(1,550)
Tax benefit — employee benefit plans	126	$ 126
Share-based compensation expense	340	340
Dividends to shareholders	(323)		(323)
Net change in fair value of financial instruments	(8)
Net change in fair value of financial instruments	(8)			(8)
Net foreign currency translation adjustments	(442)			(436)	(6)
Net postretirement benefit obligation	155			155
Net sales (purchases) of shares from noncontrolling interests	(6)	$ 1			(7)
Dividends paid to noncontrolling interests on subsidiary common stock	(27)				(27)
Balance (in shares) at Dec. 31, 2015		269.8
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	(345)		(345)
Net change in fair value of financial instruments	(12)			(12)
Net foreign currency translation adjustments	(495)			(493)	(2)
Net postretirement benefit obligation	16			16
Net sales (purchases) of shares from noncontrolling interests	(38)	$ (34)			(4)
Dividends paid to noncontrolling interests on subsidiary common stock	$ (28)				(28)
Balance (in shares) at Dec. 31, 2016	262.0	262.0
Balance at Dec. 31, 2016	$ 5,532	$ 5,580	3,807	(3,912)	57
Increase (Decrease) in Shareholders' Equity
Adoption of new accounting guidance	49	0	49	0	0
Balance at January 1, 2017	5,581	$ 5,580	3,856	(3,912)	57
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	(364)		(364)
Net change in fair value of financial instruments	12			12
Net foreign currency translation adjustments	390			385	5
Net postretirement benefit obligation	19			19
Net sales (purchases) of shares from noncontrolling interests	(11)	$ (4)			(7)
Dividends paid to noncontrolling interests on subsidiary common stock	$ (27)				(27)
Balance (in shares) at Dec. 31, 2017	247.6	247.6
Balance at Dec. 31, 2017	$ 4,648	$ 5,777	$ 2,302	$ (3,496)	$ 65