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Risk Management - Derivative Liabilities Input Level (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount | $ (488) | $ (395)
Energy commodity derivative contracts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount | (162) | (113)
Contracts available for netting | 25 | 16
Cash collateral posted | (15) | (85)
Net amount | (152) | (182)
Energy commodity derivative contracts | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount | (12) | (17)
Energy commodity derivative contracts | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount | (150) | (96)
Energy commodity derivative contracts | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount | 0 | 0
Interest rate contracts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount | (309) | (278)
Contracts available for netting | 0 | 0
Cash collateral posted | 0 | 0
Net amount | (309) | (278)
Interest rate contracts | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount | 0 | 0
Interest rate contracts | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount | (309) | (278)
Interest rate contracts | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount | 0 | 0
Foreign currency contracts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount | (17) | (4)
Contracts available for netting | 0 | 0
Cash collateral posted | 0 | 0
Net amount | (17) | (4)
Foreign currency contracts | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount | 0 | 0
Foreign currency contracts | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount | (17) | (4)
Foreign currency contracts | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount | $ 0 | $ 0

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