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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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Derivative assets and liabilities
Proceeds from settlement of interest rate hedging instruments			$ 80	$ 42
Other current assets
Derivative assets and liabilities
Net fair value of interest rate hedges	$ 57		57		$ 75
Other long-term assets, net
Derivative assets and liabilities
Net fair value of interest rate hedges	23		23		$ 45
AOCI Cash Flow Hedge
Derivative assets and liabilities
Net gain/(loss) deferred in AOCI	(59)		(59)
Interest rate derivatives
Derivative assets and liabilities
Interest rate derivatives, net	38	$ 16	40	$ 88
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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Nominal or face amount used to calculate payment on derivative.

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