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Derivatives and Risk Management Activities - Net Unrealized Gain/(Loss) Recognized in AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Derivative assets and liabilities |  |  |  |  |
Proceeds from settlement of interest rate hedging instruments |  |  | $ 80 |  |
Other current assets |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Net fair value of interest rate hedges | $ 47 |  | 47 |  | $ 75
Other long-term liabilities and deferred credits |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Net fair value of interest rate hedges | (5) |  | (5) |  |
Other long-term assets, net |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Net fair value of interest rate hedges |  |  |  |  | $ 45
AOCI Cash Flow Hedge |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Net gain/(loss) deferred in AOCI | (100) |  | (100) |  |
Interest rate derivatives |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Interest rate derivatives, net | 8 | $ 36 | 2 | $ 68 |
Cash Flow Hedge | Interest rate swaps terminated |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Notional amount of derivatives | 200 |  | 200 |  |
Proceeds from settlement of interest rate hedging instruments | 80 |  |  |  |
Cash Flow Hedge | Interest rate swaps terminated | AOCI Cash Flow Hedge |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Net gain/(loss) deferred in AOCI | $ 73 |  | $ 73 |  |

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