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Fair Value Measurements - Schedule of Fair Value of Derivative Assets and Liabilities and Effect of Counterparty Netting (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Assets    
Total Fair Value of Gross Assets & Liabilities $ 6,011 $ 3,395
Effect of Counterparty Netting (5,643) (3,041)
Effect of Collateral Netting (6) 0
Difference in Carrying Value and Fair Value 0 0
Net Carrying Value Presented on the Balance Sheet 362 354
Liabilities    
Total fair value gross liabilities 25,216 21,781
Effect of Counterparty Netting (5,643) (3,041)
Effect of Collateral Netting (106) (18)
Difference in Carrying Value and Fair Value 265 408
Net Carrying Value Presented on the Balance Sheet 19,732 19,130
Level 1    
Assets    
Total Fair Value of Gross Assets & Liabilities 5,900 3,269
Liabilities    
Total fair value gross liabilities 5,741 3,057
Level 2    
Assets    
Total Fair Value of Gross Assets & Liabilities 108 125
Liabilities    
Total fair value gross liabilities 19,474 18,724
Level 3    
Assets    
Total Fair Value of Gross Assets & Liabilities 3 1
Liabilities    
Total fair value gross liabilities 1 0
Commodity Derivative Assets | Exchange-cleared instruments    
Assets    
Commodity Derivative Assets 5,705 3,129
Effect of Counterparty Netting (5,635) (3,039)
Effect of Collateral Netting (6) 0
Difference in Carrying Value and Fair Value 0 0
Net Carrying Value Presented on the Balance Sheet 64 90
Liabilities    
Commodity Derivative Liabilities 5,741 3,098
Effect of Counterparty Netting (5,635) (3,039)
Effect of Collateral Netting (106) (18)
Difference in Carrying Value and Fair Value 0 0
Net Carrying Value Presented on the Balance Sheet 0 41
Commodity Derivative Assets | OTC instruments    
Assets    
Commodity Derivative Assets 4 1
Effect of Counterparty Netting 0 0
Effect of Collateral Netting 0 0
Difference in Carrying Value and Fair Value 0 0
Net Carrying Value Presented on the Balance Sheet 4 1
Commodity Derivative Assets | Physical forward contracts    
Assets    
Commodity Derivative Assets 107 71
Effect of Counterparty Netting (8) (2)
Effect of Collateral Netting 0 0
Difference in Carrying Value and Fair Value 0 0
Net Carrying Value Presented on the Balance Sheet 99 69
Liabilities    
Commodity Derivative Liabilities 71 50
Effect of Counterparty Netting (8) (2)
Effect of Collateral Netting 0 0
Difference in Carrying Value and Fair Value 0 0
Net Carrying Value Presented on the Balance Sheet 63 48
Commodity Derivative Assets | Level 1 | Exchange-cleared instruments    
Assets    
Commodity Derivative Assets 5,705 3,075
Liabilities    
Commodity Derivative Liabilities 5,741 3,057
Commodity Derivative Assets | Level 1 | OTC instruments    
Assets    
Commodity Derivative Assets 0 0
Commodity Derivative Assets | Level 1 | Physical forward contracts    
Assets    
Commodity Derivative Assets 0 0
Liabilities    
Commodity Derivative Liabilities 0 0
Commodity Derivative Assets | Level 2 | Exchange-cleared instruments    
Assets    
Commodity Derivative Assets 0 54
Liabilities    
Commodity Derivative Liabilities 0 41
Commodity Derivative Assets | Level 2 | OTC instruments    
Assets    
Commodity Derivative Assets 4 1
Commodity Derivative Assets | Level 2 | Physical forward contracts    
Assets    
Commodity Derivative Assets 104 70
Liabilities    
Commodity Derivative Liabilities 70 50
Commodity Derivative Assets | Level 3 | Exchange-cleared instruments    
Assets    
Commodity Derivative Assets 0 0
Liabilities    
Commodity Derivative Liabilities 0 0
Commodity Derivative Assets | Level 3 | OTC instruments    
Assets    
Commodity Derivative Assets 0 0
Commodity Derivative Assets | Level 3 | Physical forward contracts    
Assets    
Commodity Derivative Assets 3 1
Liabilities    
Commodity Derivative Liabilities 1 0
Rabbi trust assets    
Assets    
Rabbi trust assets 157 155
Difference in Carrying Value and Fair Value 0 0
Rabbi trust assets | Level 1    
Assets    
Rabbi trust assets 157 155
Rabbi trust assets | Level 2    
Assets    
Rabbi trust assets 0 0
Rabbi trust assets | Level 3    
Assets    
Rabbi trust assets 0 0
Investment in NOVONIX    
Assets    
Rabbi trust assets 38 39
Difference in Carrying Value and Fair Value 0 0
Investment in NOVONIX | Level 1    
Assets    
Rabbi trust assets 38 39
Investment in NOVONIX | Level 2    
Assets    
Rabbi trust assets 0 0
Investment in NOVONIX | Level 3    
Assets    
Rabbi trust assets 0 0
Floating-rate debt    
Liabilities    
Debt 1,240 1,915
Difference in Carrying Value and Fair Value 0 0
Floating-rate debt | Net Carrying Value Presented on the Balance Sheet    
Liabilities    
Debt 1,240 1,915
Floating-rate debt | Level 1    
Liabilities    
Debt 0 0
Floating-rate debt | Level 2    
Liabilities    
Debt 1,240 1,915
Floating-rate debt | Level 3    
Liabilities    
Debt 0 0
Fixed-rate debt, excluding finance leases and software obligations    
Liabilities    
Debt 18,164 16,718
Difference in Carrying Value and Fair Value 265 408
Fixed-rate debt, excluding finance leases and software obligations | Net Carrying Value Presented on the Balance Sheet    
Liabilities    
Debt 18,429 17,126
Fixed-rate debt, excluding finance leases and software obligations | Level 1    
Liabilities    
Debt 0 0
Fixed-rate debt, excluding finance leases and software obligations | Level 2    
Liabilities    
Debt 18,164 16,718
Fixed-rate debt, excluding finance leases and software obligations | Level 3    
Liabilities    
Debt $ 0 $ 0