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Summary of Significant Accounting Policies (Schedule of Revenue from Contracts with Customers) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers $ 5,184 $ 3,801 $ 15,475 $ 9,499
Oil, Gas and NGL Sales [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 3,668 2,635 10,943 6,546
Oil, Gas and NGL Sales [Member] | Oil [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 2,515 1,900 7,891 4,917
Oil, Gas and NGL Sales [Member] | Gas [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 666 309 1,530 699
Oil, Gas and NGL Sales [Member] | NGL [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 487 426 1,522 930
Marketing and Midstream Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 1,516 1,166 4,532 2,953
Marketing and Midstream Revenues [Member] | Oil [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 787 649 2,515 1,758
Marketing and Midstream Revenues [Member] | Gas [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 387 196 918 477
Marketing and Midstream Revenues [Member] | NGL [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers $ 342 $ 321 $ 1,099 $ 718