Fair Value Measurements (Schedule Of Assets And Liabilities Measured On Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	$ 757	$ 262
Liabilities	230	233
Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	3	10
Treasury securities	500
Prepaid expenses and other current assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	11	11
Company-owned life insurance contracts	3	4
Other noncurrent assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	194	192
Company-owned life insurance contracts	46	45
Accrued liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation plan	23	24
Other noncurrent liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation plan	207	209
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	705	203
Liabilities	230	233
Level 1 \| Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	0	0
Treasury securities	500
Level 1 \| Prepaid expenses and other current assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	11	11
Company-owned life insurance contracts	0	0
Level 1 \| Other noncurrent assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	194	192
Company-owned life insurance contracts	0	0
Level 1 \| Accrued liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation plan	23	24
Level 1 \| Other noncurrent liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation plan	207	209
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	52	59
Liabilities	0	0
Level 2 \| Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	3	10
Treasury securities	0
Level 2 \| Prepaid expenses and other current assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	0	0
Company-owned life insurance contracts	3	4
Level 2 \| Other noncurrent assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	0	0
Company-owned life insurance contracts	46	45
Level 2 \| Accrued liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation plan	0	0
Level 2 \| Other noncurrent liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation plan	0	0
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0	0
Liabilities	0	0
Level 3 \| Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	0	0
Treasury securities	0
Level 3 \| Prepaid expenses and other current assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	0	0
Company-owned life insurance contracts	0	0
Level 3 \| Other noncurrent assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	0	0
Company-owned life insurance contracts	0	0
Level 3 \| Accrued liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation plan	0	0
Level 3 \| Other noncurrent liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation plan	$ 0	$ 0

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Treasury Securities

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- Definition

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

+ References

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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Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

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Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

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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.

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Fair value of financial and nonfinancial obligations.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
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