Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Ordinary Shares and Additional Paid-in Capital	Ordinary Shares and Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Loss, Net of Tax	Accumulated Other Comprehensive Loss, Net of Tax Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss, Net of Tax Cumulative Effect, Period of Adoption, Adjusted Balance	Non-controlling Interests	Non-controlling Interests Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning Balance (in shares) at Dec. 31, 2017				247.6	247.6
Beginning Balance at Dec. 31, 2017	$ 4,648	$ 492	$ 5,140	$ 5,777	$ 5,777	$ 2,302	$ 493	$ 2,795	$ (3,496)	$ (1)	$ (3,497)	$ 65	$ 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)
Shares purchased (in shares)				(10.0)
Shares purchased	(1,454)					(1,454)
Share-based compensation expense	338			$ 338
Dividends to shareholders	(382)					(382)
Net 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)											(1)
Dividends paid to noncontrolling interests on subsidiary common stock	(32)											(32)
Ending Balance (in shares) at Dec. 31, 2018				240.1
Ending Balance at Dec. 31, 2018	4,219			$ 5,967		2,093			(3,909)			68
Increase (Decrease) in Shareholders' Equity
Net income	1,573					1,532						41
Shares issued - employee stock compensation plans (in shares)				2.5
Shares issued — employee stock compensation plans	(131)			$ (130)		(1)
Shares purchased (in shares)				(10.5)
Shares purchased	(1,960)					(1,960)
Share-based compensation expense	317			$ 317
Dividends to shareholders	(410)					(410)
Net change in fair value of financial instruments	3								3
Net foreign currency translation adjustments	14								14
Net postretirement benefit obligation	(141)								(141)
Dividends paid to noncontrolling interests on subsidiary common stock	$ (35)											(35)
Ending Balance (in shares) at Dec. 31, 2019	232.1			232.1	232.1
Ending Balance at Dec. 31, 2019	$ 3,449	$ (6)	$ 3,443	$ 6,154	$ 6,154	1,254	$ (6)	$ 1,248	(4,033)		$ (4,033)	74	$ 74
Increase (Decrease) in Shareholders' Equity
Net income	2,018					1,969						49
Shares issued - employee stock compensation plans (in shares)				1.9
Shares issued — employee stock compensation plans	(154)			$ (154)		0
Shares purchased (in shares)				(8.5)
Shares purchased	(1,763)					(1,763)
Share-based compensation expense	317			$ 317
Dividends to shareholders	(412)					(412)
Net change in fair value of financial instruments	13								13
Net foreign currency translation adjustments	263								260			3
Net postretirement benefit obligation	(101)								(101)
Net purchases of shares from noncontrolling interests	(9)			$ (3)								(6)
Dividends paid to noncontrolling interests on subsidiary common stock	$ (32)											(32)
Ending Balance (in shares) at Dec. 31, 2020	225.5			225.5
Ending Balance at Dec. 31, 2020	$ 3,583			$ 6,314		$ 1,042			$ (3,861)			$ 88