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Derivative Financial Instruments (Schedule Of Derivative Financial Instruments Included In The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Derivatives Fair Value [Line Items] |  |
Gross Fair Value | $ (1,084) | $ (142)
Net Fair Value | (1,084) | (142)
Short-term Derivative Asset [Member] |  |
Derivatives Fair Value [Line Items] |  |
Gross Fair Value | 3 | 23
Amounts Netted | (1) | (18)
Net Fair Value | $ 2 | 5
Balance Sheet Classification | Other current assets |
Long-term Derivative Asset [Member] |  |
Derivatives Fair Value [Line Items] |  |
Gross Fair Value |  | 1
Net Fair Value |  | 1
Balance Sheet Classification | Other long-term assets |
Short-term Derivative Liability [Member] |  |
Derivatives Fair Value [Line Items] |  |
Gross Fair Value | $ (984) | (161)
Amounts Netted | 1 | 18
Net Fair Value | $ (983) | (143)
Balance Sheet Classification | Other current liabilities |
Long-term Derivative Liability [Member] |  |
Derivatives Fair Value [Line Items] |  |
Gross Fair Value | $ (103) | (5)
Net Fair Value | $ (103) | $ (5)
Balance Sheet Classification | Other long-term liabilities |

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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