Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Operating cash flows:
Net income before non-controlling interests	$ 320	$ 306	$ 1,667		$ 1,377
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization of fixed assets and capitalized software			282		245
Amortization of intangible assets			265		235
Non cash lease expense			241		236
Adjustments and payments related to contingent consideration liability			(14)		(9)
Charge for early extinguishment of debt	0	0	0		32
Provision for deferred income taxes			6		95
Loss (gain) on investments	14	(7)	47		(20)
Net loss on disposition of assets			9		36
Share-based compensation expense			219		184
Change in fair value of acquisition-related derivative contracts			0		8
Changes in assets and liabilities:
Net receivables			77		(84)
Other current assets			(14)		30
Other assets			69		(59)
Accounts payable and accrued liabilities			(144)		(126)
Accrued compensation and employee benefits			(431)		(281)
Accrued income taxes			150		120
Contributions to pension and other benefit plans in excess of current year credit			(240)		(269)
Other liabilities			74		(149)
Operating lease liabilities			(254)		(240)
Effect of exchange rate changes			(10)		(70)
Net cash provided by operations			1,999		1,291
Financing cash flows:
Purchase of treasury shares			0		(300)
Net increase in commercial paper			0		325
Net borrowings from term-loan and credit facilities			1,000		300
Proceeds from issuance of debt			737		6,459
Repayments of debt			(1,011)		(760)
Payments for early extinguishment of debt			0		(585)
Purchase of non-controlling interests			(3)		(75)
Acquisition-related derivative payments			0		(337)
Shares withheld for taxes on vested units – treasury shares			(131)		(89)
Issuance of common stock from treasury shares			98		132
Payments of deferred and contingent consideration for acquisitions			(125)		(60)
Distributions of non-controlling interests			(26)		(18)
Dividends paid			(702)		(655)
Net cash (used for) provided by financing activities			(163)		4,337
Investing cash flows:
Capital expenditures			(278)		(284)
Net sales of long-term investments			102		193
Purchase of equity investment			0	$ (75)	(91)
Proceeds from sales of fixed assets			3		4
Dispositions			93		225
Acquisitions			(559)		(5,500)
Other, net			(7)		(51)
Net cash used for investing activities			(646)		(5,504)
Effect of exchange rate changes on cash and cash equivalents			43		23
Increase in cash and cash equivalents			1,233		147
Cash and cash equivalents at beginning of period			1,155		1,066
Cash and cash equivalents at end of period	$ 2,388	$ 1,213	$ 2,388	$ 1,155	$ 1,213