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Fair Value Measurements (Valuation Of Financial Instruments By Pricing Categories) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 2,179	$ 2,542	$ 3,213	$ 3,316
Assets
Available-for-sale Securities, Current	276	251
Investments Fair Value Disclosure	2,595	2,978
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	313	190
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	2,179	2,542
Assets
Investments Fair Value Disclosure	2,304	2,663
Deferred compensation arrangements	125	121
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	125	121
Fair Value, Inputs, Level 1 | Trading marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading marketable securities	125	121
Fair Value, Inputs, Level 2
Assets
Investments Fair Value Disclosure	291	315
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	80	37
Fair Value, Inputs, Level 2 | Foreign currency exchange forward contracts
Assets
Derivative Asset	15	15
Liabilities
Foreign currency exchange forward contracts	80	37
Fair Value, Inputs, Level 2 | Interest Rate Swap [Member]
Assets
Derivative Asset	0	49
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities:
Assets
Available-for-sale Securities, Current	276	251
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | Corporate and asset-backed debt securities
Assets
Available-for-sale Securities, Current	113	125
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | Foreign government debt securities
Assets
Available-for-sale Securities, Current	4	2
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | United States agency debt securities
Assets
Available-for-sale Securities, Current	28	27
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | United States Treasury debt securities
Assets
Available-for-sale Securities, Current	74	70
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | Certificates of deposit
Assets
Available-for-sale Securities, Current	57	27
Fair Value, Inputs, Level 3
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]
Beginning	32	86
Additions	78	3
Change in estimate	0	2
Settlements	(2)	(59)
Ending	108	32
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 108	$ 32

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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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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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