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Derivative Instruments and Hedging Activities - Commodity Purchases (Details) - Not Designated As Hedging Instruments [Member] - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Commodity Purchases [Line Items] |  |
Liability value | $ 34 | $ 67
Asset value | 2 | 1
Other Current Assets |  |
Commodity Purchases [Line Items] |  |
Asset value | 2 | 1
Other Current Assets | Gas Contract |  |
Commodity Purchases [Line Items] |  |
Asset value | 2 | 1
Other Current Assets | Interest Rate Swaps [Member] |  |
Commodity Purchases [Line Items] |  |
Asset value | 0 | 0
Other Current Liabilities |  |
Commodity Purchases [Line Items] |  |
Liability value | 23 | 52
Other Current Liabilities | Gas Contract |  |
Commodity Purchases [Line Items] |  |
Liability value | 22 | 51
Other Current Liabilities | Interest Rate Swaps [Member] |  |
Commodity Purchases [Line Items] |  |
Liability value |  | 1
Other Noncurrent Assets [Member] |  |
Commodity Purchases [Line Items] |  |
Asset value | 0 | 0
Other Noncurrent Assets [Member] | Gas Contract |  |
Commodity Purchases [Line Items] |  |
Asset value | 0 | 0
Other Noncurrent Assets [Member] | Interest Rate Swaps [Member] |  |
Commodity Purchases [Line Items] |  |
Asset value | 0 | 0
Other Noncurrent Liabilities |  |
Commodity Purchases [Line Items] |  |
Liability value | 11 | 15
Other Noncurrent Liabilities | Gas Contract |  |
Commodity Purchases [Line Items] |  |
Liability value | $ 5 | 9
Other Noncurrent Liabilities | Interest Rate Swaps [Member] |  |
Commodity Purchases [Line Items] |  |
Liability value |  | $ 6

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