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Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Long-term debt instruments $ 16,281   $ 18,975
Debt due within one year (1,650)   (2,694)
Fair market value adjustment for debt acquired in the Noble acquisition 578   664
Reclassified from short-term debt 4,543   4,050
Unamortized discounts and debt issuance costs (19)   (23)
Finance lease liabilities 574   403
Total long-term debt 20,307   21,375
Long-term Debt, Fiscal Year Maturity [Abstract]      
2024 1,650    
2025 4,000    
2026 2,250    
2027 2,000    
2028 600    
Thereafter $ 5,781    
PDC Energy, Inc.      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Debt issued   $ 1,500  
Notes | Notes due 2024      
Debt Instrument [Line Items]      
Weighted average interest rate 3.291%    
Long-term debt instruments $ 1,650   1,650
Notes | Notes due 2024 | Minimum      
Debt Instrument [Line Items]      
Weighted average interest rate 2.895%    
Notes | Notes due 2024 | Maximum      
Debt Instrument [Line Items]      
Weighted average interest rate 3.90%    
Notes | Notes due 2025      
Debt Instrument [Line Items]      
Weighted average interest rate 1.724%    
Long-term debt instruments $ 4,000   4,000
Notes | Notes due 2025 | Minimum      
Debt Instrument [Line Items]      
Weighted average interest rate 0.687%    
Notes | Notes due 2025 | Maximum      
Debt Instrument [Line Items]      
Weighted average interest rate 3.326%    
Notes | Notes due 2026      
Debt Instrument [Line Items]      
Interest rate 2.954%    
Long-term debt instruments $ 2,250   2,250
Notes | Notes due 2027      
Debt Instrument [Line Items]      
Weighted average interest rate 2.379%    
Long-term debt instruments $ 2,000   2,000
Notes | Notes due 2027 | Minimum      
Debt Instrument [Line Items]      
Weighted average interest rate 1.018%    
Notes | Notes due 2027 | Maximum      
Debt Instrument [Line Items]      
Weighted average interest rate 8.00%    
Notes | Notes due 2028      
Debt Instrument [Line Items]      
Interest rate 3.85%    
Long-term debt instruments $ 600   600
Notes | Notes due 2029      
Debt Instrument [Line Items]      
Interest rate 3.25%    
Long-term debt instruments $ 500   500
Notes | Notes due 2030      
Debt Instrument [Line Items]      
Interest rate 2.236%    
Long-term debt instruments $ 1,500   1,500
Notes | Notes due 2040      
Debt Instrument [Line Items]      
Interest rate 2.978%    
Long-term debt instruments $ 293   293
Notes | Notes due 2041      
Debt Instrument [Line Items]      
Interest rate 6.00%    
Long-term debt instruments $ 397   397
Notes | Notes due 2043      
Debt Instrument [Line Items]      
Interest rate 5.25%    
Long-term debt instruments $ 330   330
Notes | Notes due 2044      
Debt Instrument [Line Items]      
Interest rate 5.05%    
Long-term debt instruments $ 222   222
Notes | Notes due 2047      
Debt Instrument [Line Items]      
Interest rate 4.95%    
Long-term debt instruments $ 187   187
Notes | Notes due 2049      
Debt Instrument [Line Items]      
Interest rate 4.20%    
Long-term debt instruments $ 237   237
Notes | Notes due 2050      
Debt Instrument [Line Items]      
Weighted average interest rate 2.763%    
Long-term debt instruments $ 1,750   1,750
Notes | Notes due 2050 | Minimum      
Debt Instrument [Line Items]      
Weighted average interest rate 2.343%    
Notes | Notes due 2050 | Maximum      
Debt Instrument [Line Items]      
Weighted average interest rate 3.078%    
Notes | Notes due 2023      
Debt Instrument [Line Items]      
Long-term debt instruments $ 0   2,600
Debentures | Debentures due 2031      
Debt Instrument [Line Items]      
Interest rate 8.625%    
Long-term debt instruments $ 102   102
Debentures | Debentures due 2032      
Debt Instrument [Line Items]      
Weighted average interest rate 8.416%    
Long-term debt instruments $ 183   183
Debentures | Debentures due 2032 | Minimum      
Debt Instrument [Line Items]      
Weighted average interest rate 8.00%    
Debentures | Debentures due 2032 | Maximum      
Debt Instrument [Line Items]      
Weighted average interest rate 8.625%    
Debentures | Debentures due 2097      
Debt Instrument [Line Items]      
Interest rate 7.25%    
Long-term debt instruments $ 60   60
Loans | Bank loans due 2023      
Debt Instrument [Line Items]      
Long-term debt instruments $ 0   91
Medium-term Notes | Medium-term notes, maturing from 2023 to 2038      
Debt Instrument [Line Items]      
Weighted average interest rate 6.599%    
Long-term debt instruments $ 20   $ 23
Medium-term Notes | Medium-term notes, maturing from 2023 to 2038 | Minimum      
Debt Instrument [Line Items]      
Weighted average interest rate 5.331%    
Medium-term Notes | Medium-term notes, maturing from 2023 to 2038 | Maximum      
Debt Instrument [Line Items]      
Weighted average interest rate 7.84%    
Six Point One Two Five Percent Senior Notes | PDC Energy, Inc.      
Debt Instrument [Line Items]      
Interest rate   6.125%  
Five Point Seven Five Percent Senior Notes | PDC Energy, Inc.      
Debt Instrument [Line Items]      
Interest rate   5.75%