Partners' Capital and Distributions - Distributions, Class A (Details) - Class A Shares - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Feb. 14, 2022	Jan. 10, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Partners Capital and Distribution [Line Items]
Percentage of available cash distributed			100.00%
Number of days after end of quarter within which distributions must be paid to shareholders			55 days
Cash Distribution
Partners Capital and Distribution [Line Items]
Distributions paid to limited partners			$ 140	$ 166	$ 231
Cash distributions per Class A share (in dollars per share)			$ 0.72	$ 0.90	$ 1.38
Fourth quarter distribution | Cash Distribution | Subsequent Event
Partners Capital and Distribution [Line Items]
Distributions paid to limited partners	$ 35
Distributions per Class A share declared (in dollars per share)		$ 0.18