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Discontinued Operations (Amounts Reported as Discontinued Operations in the Consolidated Statements of Comprehensive Earnings) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]    
Oil, gas and NGL sales $ 263 $ 1,227
Oil, gas and NGL derivatives   (113)
Marketing and midstream revenues   38
Total revenues 263 1,152
Production expenses 214 599
Exploration expenses   13
Marketing and midstream expenses   18
Depreciation, depletion and amortization   205
Asset impairments 182 785
Asset dispositions 1 (222)
General and administrative expenses 3 34
Financing costs, net (3) 87
Restructuring and transaction costs 9 248
Other expenses 9 17
Total expenses 415 1,784
Loss from discontinued operations before income taxes (152) (632)
Income tax expense (benefit) (24) (358)
Loss from discontinued operations, net of tax (128) (274)
Earnings (loss) from discontinued operations before income taxes (152) (632)
Barnett Shale [Member]    
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]    
Oil, gas and NGL sales 263 486
Total revenues 263 486
Production expenses 214 306
Depreciation, depletion and amortization   77
Asset impairments 182 748
Asset dispositions (4) 1
Other expenses 10 11
Total expenses 402 1,143
Loss from discontinued operations before income taxes (139) (657)
Income tax expense (benefit) (11) (142)
Loss from discontinued operations, net of tax (128) (515)
Earnings (loss) from discontinued operations before income taxes (139) (657)
Canada [Member]    
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]    
Oil, gas and NGL sales   741
Oil, gas and NGL derivatives   (113)
Marketing and midstream revenues   38
Total revenues   666
Production expenses   293
Exploration expenses   13
Marketing and midstream expenses   18
Depreciation, depletion and amortization   128
Asset impairments   37
Asset dispositions 5 (223)
General and administrative expenses 3 34
Financing costs, net (3) 87
Restructuring and transaction costs 9 248
Other expenses (1) 6
Total expenses 13 641
Loss from discontinued operations before income taxes (13) 25
Income tax expense (benefit) (13) (216)
Loss from discontinued operations, net of tax   241
Earnings (loss) from discontinued operations before income taxes $ (13) $ 25