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Fair Value Measurements (Valuation Of Financial Instruments By Pricing Categories) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 2,592	$ 3,316	$ 2,953	$ 3,379
Assets
Available-for-sale Securities, Current	97	68
Investments Fair Value Disclosure	2,891	3,580
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	188	198
Interest Rate Swap [Member]
Assets
Derivative Asset	0	0
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	2,592	3,316
Assets
Investments Fair Value Disclosure	2,706	3,410
Deferred compensation arrangements	114	94
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	114	94
Fair Value, Inputs, Level 1 | Trading marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading marketable securities	114	94
Fair Value, Inputs, Level 2
Assets
Investments Fair Value Disclosure	185	170
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	41	18
Fair Value, Inputs, Level 2 | Foreign currency exchange forward contracts
Assets
Derivative Asset	38	45
Liabilities
Foreign currency exchange forward contracts	41	18
Fair Value, Inputs, Level 2 | Interest Rate Swap [Member]
Assets
Derivative Asset	50	57
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities:
Assets
Available-for-sale Securities, Current	97	68
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | Corporate and asset-backed debt securities
Assets
Available-for-sale Securities, Current	33	25
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | United States agency debt securities
Assets
Available-for-sale Securities, Current	19	9
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | United States Treasury debt securities
Assets
Available-for-sale Securities, Current	24	16
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | Certificates of deposit
Assets
Available-for-sale Securities, Current	21	18
Fair Value, Inputs, Level 3
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]
Beginning	86	56
Additions	5	49
Change in estimate	(2)	(7)
Settlements	(56)	(12)
Ending	33	86
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 33	$ 86

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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