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Partners' Capital and Distributions - Common Equity Repurchase Program (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021
Common Units
Partners Capital and Distribution [Line Items]
Repurchase and cancellation of common units under the Common Equity Repurchase Program (units)	4,940,592	350,000
Common Equity Repurchase Program
Partners Capital and Distribution [Line Items]
Common equity repurchase program, repurchased amount (dollars)			$ 53
Common equity repurchase program, remaining amount	$ 397		$ 397
Common Equity Repurchase Program | Common Units
Partners Capital and Distribution [Line Items]
Repurchase and cancellation of common units under the Common Equity Repurchase Program (units)			5,290,592

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Number of shares that have been repurchased and retired during the period.

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