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Accounts Receivable (Schedule Of Components Of Accounts Receivable) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Joint interest billings | $ 57 | $ 168
Other | 25 | 13
Gross accounts receivable | 612 | 840
Allowance for doubtful accounts | (11) | (8)
Net accounts receivable | 601 | 832
Oil, Gas and NGL Sales [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross accounts receivable | 335 | 452
Marketing and Midstream Revenues [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross accounts receivable | $ 195 | $ 207

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- Definition Current portion of accounts receivable attributable to joint interest partners in oil and gas properties. These are billings to the non-operators associated with the operation of wells and are based on those owners' working interests in the wells. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 323 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6474814&loc=d3e64006-109457 + Details
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