Partners' Capital and Distributions - Common Equity Repurchase Program (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Common Units
Partners Capital and Distribution
Repurchase and cancellation of common units under the Common Equity Repurchase Program (units)	2,375,299	350,000
Common Equity Repurchase Program
Partners Capital and Distribution
Common equity repurchase program, repurchased amount	$ 25	$ 3
Common equity repurchase program, remaining amount	$ 247
Common Equity Repurchase Program | Common Units
Partners Capital and Distribution
Repurchase and cancellation of common units under the Common Equity Repurchase Program (units)	2,400,000	400,000