Members' Equity - Components to Compute Basic and Diluted Earnings per Unit (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Weighted average basic common units outstanding (in units)	488.6	489.7	489.6	489.2
Dilutive effect of non-vested restricted units (in units)	6.2	1.2	0.0	0.0
Total weighted average diluted common units outstanding (in units)	494.8	490.9	489.6	489.2