Condensed Consolidated Statement 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
Increase (Decrease) in Shareholders' Equity
Balance at January 1, 2018	$ 5,581	$ 5,580	$ 3,856	$ (3,912)	$ 57
Beginning Balance (in shares) at Dec. 31, 2016		262.0
Increase (Decrease) in Shareholders' Equity
Net income	1,083		1,060		23
Shares issued - employee stock compensation plans (in shares)		2.9
Shares issued - employee stock compensation plans	(138)	$ (138)
Shares purchased (in shares)		(9.2)
Shares purchased	(1,160)		(1,160)
Share-based compensation expense	148	$ 148
Dividends to shareholders	(182)		(182)
Net change in fair value of financial instruments	2			2
Net foreign currency translation adjustments	191			195	(4)
Net postretirement benefit obligation	38			38
Purchases of shares from noncontrolling interests	(1)				(1)
Dividends paid to noncontrolling interests on subsidiary common stock	(9)				(9)
Ending Balance (in shares) at Jun. 30, 2017		255.7
Ending Balance at Jun. 30, 2017	5,553	$ 5,590	3,574	(3,677)	66
Increase (Decrease) in Shareholders' Equity
Adoption of new accounting guidance	492	0	493	(1)	0
Balance at January 1, 2018	$ 5,140	$ 5,777	2,795	(3,497)	65
Beginning Balance (in shares) at Dec. 31, 2017	247.6	247.6
Beginning Balance at Dec. 31, 2017	$ 4,648	$ 5,777	2,302	(3,496)	65
Increase (Decrease) in Shareholders' Equity
Net income	668		642		26
Shares issued - employee stock compensation plans (in shares)		2.1
Shares issued - employee stock compensation plans	(150)	$ (150)
Shares purchased (in shares)		(6.7)
Shares purchased	(955)		(955)
Share-based compensation expense	147	$ 147
Dividends to shareholders	(187)		(187)
Net change in fair value of financial instruments	13			13
Net foreign currency translation adjustments	(213)			(210)	(3)
Net postretirement benefit obligation	170			170
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	243.0
Ending Balance at Jun. 30, 2018	$ 4,618	$ 5,774	$ 2,295	$ (3,524)	$ 73