Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Shares	Non-Controlling Interests
Balance, beginning of year at Dec. 31, 2017		$ 561	$ 784	$ 13,140	$ (4,043)	$ (3,083)	$ 83
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			(26)
Issuance of shares under stock compensation plans and employee stock purchase plans			(26)			140
Cumulative effect of adoption of new accounting standards | Accounting Standards Update 2014-09				364
Cumulative effect of adoption of new accounting standards | Accounting Standards Update 2016-01					(14)
Net income attributable to the Company	$ 1,232			1,221			11
Dividend equivalents declared				(3)
Dividends declared				(591)
Other comprehensive income (loss), net of tax	(208)				(208)
Purchase of treasury shares						(500)
Net non-controlling interests acquired							0
Distributions and other changes							(13)
Balance, end of period at Jun. 30, 2018	$ 7,797		732	14,131	(4,265)	(3,443)	81
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (in dollars per share)	$ 1.165
Balance, beginning of year at Mar. 31, 2018		561	682	13,812	(3,905)	(3,210)	81
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			49
Issuance of shares under stock compensation plans and employee stock purchase plans			1			17
Cumulative effect of adoption of new accounting standards | Accounting Standards Update 2014-09				0
Cumulative effect of adoption of new accounting standards | Accounting Standards Update 2016-01					0
Net income attributable to the Company	$ 536			531			5
Dividend equivalents declared				(2)
Dividends declared				(210)
Other comprehensive income (loss), net of tax	(360)				(360)
Purchase of treasury shares						(250)
Net non-controlling interests acquired							0
Distributions and other changes							(5)
Balance, end of period at Jun. 30, 2018	$ 7,797		732	14,131	(4,265)	(3,443)	81
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (in dollars per share)	$ 0.415
Balance, beginning of year at Dec. 31, 2018	$ 7,584	561	817	14,347	(4,647)	(3,567)	73
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			(42)
Issuance of shares under stock compensation plans and employee stock purchase plans			(39)			221
Cumulative effect of adoption of new accounting standards | Accounting Standards Update 2014-09				0
Cumulative effect of adoption of new accounting standards | Accounting Standards Update 2016-01					0
Net income attributable to the Company	1,071			1,048			23
Dividend equivalents declared				(4)
Dividends declared				(650)
Other comprehensive income (loss), net of tax	120				120
Purchase of treasury shares						(100)
Net non-controlling interests acquired							195
Distributions and other changes							(19)
Balance, end of period at Jun. 30, 2019	$ 8,337		736	14,741	(4,527)	(3,446)	272
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (in dollars per share)	$ 1.285
Balance, beginning of year at Mar. 31, 2019		$ 561	681	14,642	(4,590)	(3,385)	77
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			59
Issuance of shares under stock compensation plans and employee stock purchase plans			(4)			39
Cumulative effect of adoption of new accounting standards | Accounting Standards Update 2014-09				0
Cumulative effect of adoption of new accounting standards | Accounting Standards Update 2016-01					0
Net income attributable to the Company	$ 344			332			12
Dividend equivalents declared				(2)
Dividends declared				(231)
Other comprehensive income (loss), net of tax	63				63
Purchase of treasury shares						(100)
Net non-controlling interests acquired							195
Distributions and other changes							(12)
Balance, end of period at Jun. 30, 2019	$ 8,337		$ 736	$ 14,741	$ (4,527)	$ (3,446)	$ 272
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (in dollars per share)	$ 0.455