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Revenue Recognition (Summary Of Changes In Contract Liabilities) (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Revenue Recognition [Abstract] |  |
Contract current liabilities, Beginning balance | $ 34 | $ 33
Contract current liabilities, Revenue recognized included in opening contract balance | (31) | (26)
Contract current liabilities, Credits granted, excluding amounts recognized as revenue | 40 | 26
Contract current liabilities, Reclassified between current and noncurrent | (3) |
Contract current liabilities, Ending balance | 40 | 33
Contract noncurrent liabilities, Beginning balance | 14 | 16
Contract noncurrent liabilities, Revenue recognized included in opening contract balance | (14) | (14)
Contract noncurrent liabilities, Credits granted, excluding amounts recognized as revenue | 10 | 12
Contract noncurrent liabilities, Reclassified between current and noncurrent | 3 |
Contract noncurrent liabilities, Ending balance | $ 13 | $ 14

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- Definition Contract With Customer, Liability, Credits Granted Excluding Amounts Recognized As Revenue, Current + References No definition available. + Details
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Period Type: | duration

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- Definition Contract With Customer Liability, Credits Granted, Excluding Amounts Recognized As Revenue, Noncurrent + References No definition available. + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
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