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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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