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Supplemental Oil and Gas Disclosures (Results of Operations for Oil and Gas Producing Activities Disclosure) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oil and Gas Exploration and Production Industries Disclosures [Abstract]      
Sales $ 1,703 $ 2,525 $ 2,086
Production (lifting) costs (781) (974) (891)
Depreciation, depletion and amortization (462) (514) (440)
Results of operations - income before income taxes 460 1,037 755
Provision (benefit) for income taxes 110 0 0
Results of operations $ 350 1,037 755
Income tax expense, before valuation allowance   $ 254 $ 287