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Derivatives and Risk Management Activities - Net Unrealized Gain/(Loss) Recognized in AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Derivative assets and liabilities |  |  |  |  |
Proceeds from settlement of interest rate hedging instruments |  |  | $ (57) | $ (80) |
Other long-term assets, net |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Net fair value of interest rate hedges | $ 7 |  | 7 |  | $ 4
Other current assets |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Net fair value of interest rate hedges |  |  |  |  | $ 51
Interest Rate Swaps Terminated | Cash Flow Hedge |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Notional amount of derivatives | 100 |  | 100 |  |
Proceeds from settlement of interest rate hedging instruments |  |  | 57 |  |
Interest rate derivatives |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Interest rate derivatives, net | (9) | $ 38 | 9 | $ 40 |
AOCI Cash Flow Hedge |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Net gain (loss) deferred in AOCI | (66) |  | (66) |  |
AOCI Cash Flow Hedge | Interest Rate Swaps Terminated | Cash Flow Hedge |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Net gain (loss) deferred in AOCI | $ 57 |  | $ 57 |  |

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