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Fair Value Measurement - Schedule of Fair Value Hierarchy for Gross Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commodity derivatives $ 662 $ 2,037
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in debt securities 1,354 1,222
Commodity derivatives 662 2,037
Total assets 2,016 3,259
Commodity derivatives 603 2,010
Total liabilities 603 2,010
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in debt securities 276 178
Commodity derivatives 361 958
Total assets 637 1,136
Commodity derivatives 376 906
Total liabilities 376 906
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in debt securities 1,078 1,044
Commodity derivatives 231 951
Total assets 1,309 1,995
Commodity derivatives 203 843
Total liabilities 203 843
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in debt securities 0 0
Commodity derivatives 70 128
Total assets 70 128
Commodity derivatives 24 261
Total liabilities $ 24 $ 261