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Restructuring and Transaction Costs (Schedule Of The Activity And Balances Associated With Restructuring Liabilities) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost And Reserve [Line Items] |  |
Beginning balance | $ 21 | $ 42
Restructuring reserve activity | 166 |
Ending balance | 172 | 21
Prior years' restructurings [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve activity | (18) | (39)
Reduction of workforce [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve activity | 3 | 18
Other Current Liabilities [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Beginning balance | 20 | 39
Restructuring reserve activity | 30 |
Ending balance | 35 | 20
Other Current Liabilities [Member] | Prior years' restructurings [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve activity | (18) | (37)
Other Current Liabilities [Member] | Reduction of workforce [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve activity | 3 | 18
Other Long-Term Liabilities [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Beginning balance | 1 | 3
Restructuring reserve activity | 136 |
Ending balance | $ 137 | 1
Other Long-Term Liabilities [Member] | Prior years' restructurings [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve activity |  | $ (2)

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- Definition Restructuring reserve changes related to retained liabilities. + References No definition available. + Details
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- Definition 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. + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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