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Summary of Significant Accounting Policies (Schedule of Revenue from Contracts with Customers Disaggregated Based on Type of Good) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation Of Revenue [Line Items]      
Oil, gas and NGL sales $ 15,140 $ 19,827 $ 13,750
Oil, Gas and NGL Sales [Member]      
Disaggregation Of Revenue [Line Items]      
Oil, gas and NGL sales 10,791 14,082 9,531
Oil, Gas and NGL Sales [Member] | Gas [Member]      
Disaggregation Of Revenue [Line Items]      
Oil, gas and NGL sales 703 1,948 1,104
Oil, Gas and NGL Sales [Member] | NGL [Member]      
Disaggregation Of Revenue [Line Items]      
Oil, gas and NGL sales 1,209 1,853 1,431
Oil, Gas and NGL Sales [Member] | Oil [Member]      
Disaggregation Of Revenue [Line Items]      
Oil, gas and NGL sales 8,879 10,281 6,996
Marketing and Midstream Revenues [Member]      
Disaggregation Of Revenue [Line Items]      
Oil, gas and NGL sales 4,349 5,745 4,219
Marketing and Midstream Revenues [Member] | Gas [Member]      
Disaggregation Of Revenue [Line Items]      
Oil, gas and NGL sales 572 1,163 718
Marketing and Midstream Revenues [Member] | NGL [Member]      
Disaggregation Of Revenue [Line Items]      
Oil, gas and NGL sales 759 1,277 1,050
Marketing and Midstream Revenues [Member] | Oil [Member]      
Disaggregation Of Revenue [Line Items]      
Oil, gas and NGL sales $ 3,018 $ 3,305 $ 2,451