Earnings per Unit - Basic and Diluted Earnings Per Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Allocation of net income among partner interests:
Net income attributable to common unitholders	$ 276	$ 269
Class A common units
Allocation of net income among partner interests:
Net income attributable to common unitholders	$ 189	$ 183
Denominator - basic and diluted partnership units:
Weighted average number of unit outstanding, basic (in shares)	202	202
Weighted average number of units outstanding, diluted (in shares)	202	202
Earnings per unit - basic and diluted:
Earnings per unit, basic (in usd per share)	$ 0.94	$ 0.91
Earnings per unit, diluted (in usd per share)	$ 0.94	$ 0.91
Partnership exchangeable units
Allocation of net income among partner interests:
Net income attributable to common unitholders	$ 87	$ 86
Denominator - basic and diluted partnership units:
Weighted average number of unit outstanding, basic (in shares)	143	145
Weighted average number of units outstanding, diluted (in shares)	143	145
Earnings per unit - basic and diluted:
Earnings per unit, basic (in usd per share)	$ 0.61	$ 0.59
Earnings per unit, diluted (in usd per share)	$ 0.61	$ 0.59