Financial Instruments, Derivatives and Fair Value Measures - Bases of Measurement (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Maximum
Fair value, asset and liability measures
Contingent consideration related to business combinations	$ 470
Recurring
Fair value, asset and liability measures
Equity securities	357	$ 320
Interest rate swap derivative financial instruments, assets	48
Foreign currency forward exchange contracts	148	114
Total Assets	553	434
Fair value of hedged long-term debt	2,890	2,743
Interest rate swap financial instruments, liabilities		100
Foreign currency forward exchange contracts	89	95
Contingent consideration related to business combinations	68	71
Total Liabilities	3,047	3,009
Recurring \| Quoted Prices in Active Markets
Fair value, asset and liability measures
Equity securities	357	320
Total Assets	357	320
Recurring \| Significant Other Observable Inputs
Fair value, asset and liability measures
Interest rate swap derivative financial instruments, assets	48
Foreign currency forward exchange contracts	148	114
Total Assets	196	114
Fair value of hedged long-term debt	2,890	2,743
Interest rate swap financial instruments, liabilities		100
Foreign currency forward exchange contracts	89	95
Total Liabilities	2,979	2,938
Recurring \| Significant Unobservable Inputs
Fair value, asset and liability measures
Contingent consideration related to business combinations	68	71
Total Liabilities	$ 68	$ 71

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Fair value as of the balance sheet date of all foreign currency derivative assets designated as cash flow hedging instruments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
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Fair value as of the balance sheet date of all foreign currency derivative liabilities designated as cash flow hedging instruments.

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Amount of liability hedged in fair value hedging relationship.

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-SubTopic 10
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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

+ References

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Fair value as of the balance sheet date of all derivative liabilities designated as interest rate fair value hedging instruments.

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- Definition

Fair value of financial and nonfinancial obligations.

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- Definition

Fair value of investments in trading equity securities and other forms of trading securities that provide ownership interests.

+ References

No definition available.

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