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Discontinued Operations and Assets Held for Sale (Amounts Reported as Discontinued Operations in the Consolidated Statements of Comprehensive Earnings) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Oil, gas and NGL sales | $ 94 | $ 112 | $ 263 | $ 1,106
Oil, gas and NGL derivatives |  | (18) |  | (113)
Marketing and midstream revenues |  |  |  | 38
Total revenues | 94 | 94 | 263 | 1,031
Production expenses | 66 | 74 | 214 | 525
Exploration expenses |  |  |  | 13
Marketing and midstream expenses |  |  |  | 18
Depreciation, depletion and amortization |  | 20 |  | 188
Asset impairments | 3 |  | 182 | 37
Asset dispositions |  | (35) | (2) | (222)
General and administrative expenses | 2 | 2 | 3 | 33
Financing costs, net | (1) | 59 | (3) | 85
Restructuring and transaction costs |  | 5 |  | 244
Other expenses | 26 | 8 | 19 | 17
Total expenses | 96 | 133 | 413 | 938
Earnings (loss) from discontinued operations before income taxes | (2) | (39) | (150) | 93
Income tax expense (benefit) | (15) | (12) | (47) | (285)
Net earnings (loss) from discontinued operations, net of tax | 13 | (27) | (103) | 378
Barnett Shale [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Oil, gas and NGL sales | 94 | 101 | 263 | 365
Total revenues | 94 | 101 | 263 | 365
Production expenses | 66 | 75 | 214 | 232
Depreciation, depletion and amortization |  | 20 |  | 60
Asset impairments | 3 |  | 182 |
Asset dispositions |  | (1) |  | 1
Other expenses | 27 | 3 | 16 | 9
Total expenses | 96 | 97 | 412 | 302
Earnings (loss) from discontinued operations before income taxes | (2) | 4 | (149) | 63
Income tax expense (benefit) |  | 1 | (32) | 13
Net earnings (loss) from discontinued operations, net of tax | (2) | 3 | (117) | 50
Canada [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Oil, gas and NGL sales |  | 11 |  | 741
Oil, gas and NGL derivatives |  | (18) |  | (113)
Marketing and midstream revenues |  |  |  | 38
Total revenues |  | (7) |  | 666
Production expenses |  | (1) |  | 293
Exploration expenses |  |  |  | 13
Marketing and midstream expenses |  |  |  | 18
Depreciation, depletion and amortization |  |  |  | 128
Asset impairments |  |  |  | 37
Asset dispositions |  | (34) | (2) | (223)
General and administrative expenses | 2 | 2 | 3 | 33
Financing costs, net | (1) | 59 | (3) | 85
Restructuring and transaction costs |  | 5 |  | 244
Other expenses | (1) | 5 | 3 | 8
Total expenses |  | 36 | 1 | 636
Earnings (loss) from discontinued operations before income taxes |  | (43) | (1) | 30
Income tax expense (benefit) | (15) | (13) | (15) | (298)
Net earnings (loss) from discontinued operations, net of tax | $ 15 | $ (30) | $ 14 | $ 328

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