Financial Instruments, Derivatives and Fair Value Measures - Bases of Measurement (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Maximum
Fair value, asset and liability measures
Contingent consideration related to business combinations	$ 200
Quoted Prices in Active Markets
Fair value, asset and liability measures
Equity securities	386	$ 357
Total Assets	386	357
Significant Other Observable Inputs
Fair value, asset and liability measures
Interest rate swap derivative financial instruments, assets	210	48
Foreign currency forward exchange contracts	90	148
Total Assets	300	196
Fair value of hedged long-term debt	3,049	2,890
Foreign currency forward exchange contracts	498	89
Total Liabilities	3,547	2,979
Significant Unobservable Inputs
Fair value, asset and liability measures
Contingent consideration related to business combinations	68	68
Total Liabilities	68	68
Recurring
Fair value, asset and liability measures
Equity securities	386	357
Interest rate swap derivative financial instruments, assets	210	48
Foreign currency forward exchange contracts	90	148
Total Assets	686	553
Fair value of hedged long-term debt	3,049	2,890
Foreign currency forward exchange contracts	498	89
Contingent consideration related to business combinations	68	68
Total Liabilities	$ 3,615	$ 3,047

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
-Subparagraph (a)
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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)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 30
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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.

+ References

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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- Definition

Amount of liability hedged in fair value hedging relationship.

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-Name Accounting Standards Codification
-Topic 815
-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

No definition available.

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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

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