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Share-Based Compensation (Schedule Of Share-Based Compensation Expense Included In The Consolidated Statements Of Comprehensive Earnings) (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Share-based compensation expense | $ 70 | $ 92
Related income tax benefit |  | 13
G&A [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Share-based compensation expense | 58 | 64
Exploration Expenses [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Share-based compensation expense | 1 | 1
Restructuring and Transaction Costs [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Accelerated share-based compensation expense | $ 11 | $ 27

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