Capital Accounts, Redeemable Preferred Limited Partner Interests (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020	Dec. 31, 2021	Sep. 30, 2020
Temporary Equity [Line Items]
Series A cumulative convertible preferred units (in dollars per unit)						$ 1,000
Series A cumulative convertible preferred units, paid-in kind distribution (in units)	275
Series A cumulative convertible preferred units outstanding (in units)	50,687	50,412	50,412		50,412	50,000
Total distributions paid to convertible preferred unitholders	$ 4
Cash distributions paid to convertible preferred unitholders	$ 3	$ 3	$ 3
Preferred unit distribution rate	7.25%
Redemption price per preferred unit on or after September 30, 2025 at unitholder election (in dollars per unit)	$ 1,000
Redemption price per preferred unit from September 30, 2024 through September 29, 2025 (in dollars per unit)	1,030
Redemption price per preferred unit from September 30, 2025 through September 29, 2026 (in dollars per unit)	1,010
Redemption price per preferred unit on or after September 30, 2026 (in dollars per unit)	1,000
Redemption price per preferred unit if Change of Control event occurs (in dollars per unit)	$ 1,010
Percentage applied to the common unit market price in calculating the number of common units to be acquired upon the conversion of series A preferred units to common units	92.50%
Percentage of preferred units that may be converted into common units at unitholder option	50.00%
Preferred Units [Member]
Temporary Equity [Line Items]
Treasury units outstanding (preferred units) (in units)						855,915
Common Units [Member]
Temporary Equity [Line Items]
Treasury units acquired in connection with settlement of Liquidity Option in March 2020 (in units)				(54,807,352)