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Compensation Related Costs, Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2024

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures

The changes in the benefit obligation, the changes in fair value of plan assets, the funded status and the amounts recognized in the consolidated balance sheets for our Pension Plans and other postretirement benefit plans as of December 31, 2024 were as follows:

			Pension Plans						Other Postretirement Benefit Plans
Change in benefit obligation:
Benefit obligation at beginning of period			$	—					$	—
NuStar acquisition			152						12
Service cost			1						—
Interest cost			5						1
Plan amendments			—						(11)
Benefits paid, net			(36)						—
Actuarial loss and other			15						(1)
Benefit obligation at end of period			137						1
Change in plan assets:
Fair value of plan assets at beginning of period			$	—					$	—
NuStar acquisition			178						—
Actual return on plan assets			12						—
Employer contributions			5						—
Benefits paid, net			(35)						—
Fair value of plan assets at end of period			160						—
Amount underfunded (overfunded) at end of period			$	(23)					$	1

			Pension Plans						Other Postretirement Benefit Plans
Amounts recognized in the consolidated balance sheets consist of:
Non-current assets			$	24					$	—
Current liabilities			(1)						(1)
			$	23					$	(1)
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of:
Net actuarial loss			$	(9)					$	—
Prior service credit			—						11
			$	(9)					$	11

Schedule of Net Benefit Costs

The components of net periodic benefit cost for the period from the NuStar acquisition (May 3, 2024) to December 31, 2024 related to our Pension Plans and other postretirement benefit plans were as follows:

			Pension Plans						Other Postretirement Benefit Plans
Net periodic benefit cost:
Service cost			$	1					$	—
Interest cost			5						1
Expected return on plan assets			(8)						—
Settlement charge			2						—
Net periodic benefit cost			$	—					$	1

Schedule of Changes in Fair Value of Plan Assets

The major classes of plan assets measured at fair value for the Pension Plan at December 31, 2024 were as follows:

			Level 1						Level 2						Level 3						Total
Cash equivalent securities			$	80					$	—					$	—					$	80
Investment trusts(1)			—						44						—						44
Fixed income securities			36						—						—						36
Total			$	116					$	44					$	—					$	160

(1)    Includes long-term and intermediate credit bonds.

Schedule of Accumulated Other Comprehensive Income (Loss)

The following table presents the components of AOCI, net of tax:

			December 31, 2024						December 31, 2023
Foreign currency translation adjustment			$	(1)					$	—
Actuarial gains related to pensions and other postretirement benefits			3						—
Total accumulated other comprehensive income included in partners’ capital, net of tax			$	2					$	—

Schedule of Expected Benefit Payments

As of December 31, 2024, the following benefit payments were expected to be paid for the years ending December 31:

			Pension Plans						Other Postretirement Benefit Plans
2025			$	71					$	1
2026			3						—
2027			3						—
2028			3						—
2029			4						—
2030-2034			19						—

Defined Benefit Plan, Assumptions

The weighted-average assumptions used to determine the benefit obligations at December 31, 2024 were as follows:

			Pension Plans						Other Postretirement Benefit Plans
Discount rate			5.46		%				5.64		%
Rate of compensation increase			n/a						n/a
Cash balance interest crediting rate			2.59		%				n/a

The weighted-average assumptions used to determine the net periodic benefit cost for the period from acquisition to December 31, 2024 related to our Pension Plans and other postretirement benefit plans were as follows:

			Pension Plans						Other Postretirement Benefit Plans
Discount rate			5.76		%				5.74		%
Expected long-term rate of return on plan assets			6.75		%				n/a
Rate of compensation increase			n/a						n/a
Cash balance interest crediting rate			4.26		%				n/a

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