Derivatives and Risk Management Activities - Preferred Distribution Rate (Details) - Preferred Distribution Rate Reset Option - Derivatives Not Designated as a Hedge - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other long-term liabilities and deferred credits
Derivatives and Risk Management Activities
Derivative liability		$ 14
Other long-term liabilities and deferred credits | Maximum
Derivatives and Risk Management Activities
Derivative liability	$ 1
Other income/(expense), net
Derivatives and Risk Management Activities
Gain/(loss) recognized	$ 14	$ 20	$ 2