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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Oil, gas and NGL sales $ 77 $ 494 $ 169 $ 994
Oil, gas and NGL derivatives   9   (95)
Marketing and midstream revenues   12   38
Total revenues 77 515 169 937
Production expenses 74 229 148 451
Exploration expenses   4   13
Marketing and midstream expenses   9   18
Depreciation, depletion and amortization   69   168
Asset impairments   37 179 37
Asset dispositions (2) (188) (2) (187)
General and administrative expenses   13 1 31
Financing costs, net   13 (2) 26
Restructuring and transaction costs   236   239
Other expenses (4) 31 (7) 9
Total expenses 68 453 317 805
Earnings (loss) from discontinued operations before income taxes 9 62 (148) 132
Income tax expense (benefit)   (282) (32) (273)
Net earnings (loss) from discontinued operations, net of tax 9 344 (116) 405
Barnett Shale [Member]        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Oil, gas and NGL sales 77 115 169 264
Total revenues 77 115 169 264
Production expenses 74 76 148 157
Depreciation, depletion and amortization   20   40
Asset impairments     179  
Asset dispositions   1   2
Other expenses 2   (11) 6
Total expenses 76 97 316 205
Earnings (loss) from discontinued operations before income taxes 1 18 (147) 59
Income tax expense (benefit)   3 (32) 12
Net earnings (loss) from discontinued operations, net of tax 1 15 (115) 47
Canada [Member]        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Oil, gas and NGL sales   379   730
Oil, gas and NGL derivatives   9   (95)
Marketing and midstream revenues   12   38
Total revenues   400   673
Production expenses   153   294
Exploration expenses   4   13
Marketing and midstream expenses   9   18
Depreciation, depletion and amortization   49   128
Asset impairments   37   37
Asset dispositions (2) (189) (2) (189)
General and administrative expenses   13 1 31
Financing costs, net   13 (2) 26
Restructuring and transaction costs   236   239
Other expenses (6) 31 4 3
Total expenses (8) 356 1 600
Earnings (loss) from discontinued operations before income taxes 8 44 (1) 73
Income tax expense (benefit)   (285)   (285)
Net earnings (loss) from discontinued operations, net of tax $ 8 $ 329 $ (1) $ 358