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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