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Retirement Benefits Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

Certain of the Partnership’s subsidiaries sponsor pension and/or other postretirement benefit plans that provide benefits to a defined group of retirees. The following table contains information at the dates indicated about the obligations and funded status of pension and other postretirement plans on a combined basis:

			December 31, 2023																		December 31, 2022
			Pension Benefits																		Pension Benefits
			Funded Plans						Unfunded Plans						Other Postretirement Benefits						Funded Plans						Unfunded Plans						Other Postretirement Benefits
Change in benefit obligation:
Benefit obligation at beginning of period			$	22					$	19					$	148					$	50					$	26					$	195
Service cost			—						—						—						—						—						1
Interest cost			1						1						6						1						1						4
Benefits paid, net			(1)						(3)						(13)						(1)						(3)						(14)
Actuarial gain and other			1						—						(3)						(8)						(3)						(38)
Energy Transfer Canada sale			—						—						—						(20)						(2)						—
Benefit obligation at end of period			23						17						138						22						19						148
Change in plan assets:
Fair value of plan assets at beginning of period			20						—						259						44						—						311
Return on plan assets and other			2						—						29						(4)						—						(41)
Employer contributions			1						—						2						1						—						3
Benefits paid, net			(1)						—						(13)						(1)						—						(14)
Energy Transfer Canada sale			—						—						—						(20)						—						—
Fair value of plan assets at end of period			22						—						277						20						—						259
Amount underfunded (overfunded) at end of period			$	1					$	17					$	(139)					$	2					$	19					$	(111)
Amounts recognized in the consolidated balance sheets consist of:
Non-current assets			$	—					$	—					$	155					$	—					$	—					$	127
Current liabilities			—						(3)						(2)						—						(3)						(2)
Non-current liabilities			(1)						(14)						(14)						(2)						(16)						(14)
			$	(1)					$	(17)					$	139					$	(2)					$	(19)					$	111
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of:
Net actuarial gain (loss)			$	—					$	(2)					$	(12)					$	—					$	(2)					$	5
Prior service credit			—						—						(3)						—						—						(3)
			$	—					$	(2)					$	(15)					$	—					$	(2)					$	2

Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block]

The following table summarizes information at the dates indicated for plans with an accumulated benefit obligation in excess of plan assets:

			December 31, 2023																		December 31, 2022
			Pension Benefits																		Pension Benefits
			Funded Plans						Unfunded Plans						Other Postretirement Benefits						Funded Plans						Unfunded Plans						Other Postretirement Benefits
Projected benefit obligation			$	23					$	15					N/A						$	22					$	19					N/A
Accumulated benefit obligation			23						17						$	138					22						19						$	148
Fair value of plan assets			22						—						277						20						—						259

Schedule of Health Care Cost Trend Rates [Table Text Block]

The assumed health care cost trend weighted-average rates used to measure the expected cost of benefits covered by the plans are shown in the following table:

			December 31,
			2023						2022
Health care cost trend rate			7.42		%				7.48		%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)			5.17		%				5.18		%
Year that the rate reaches the ultimate trend rate			2031						2030

Fair Value of Plan Assets [Table Text Block]

The fair value of the pension plan assets by asset category at the dates indicated is as follows:

												Fair Value Measurements at December 31, 2023
						Fair Value Total						Level 1						Level 2						Level 3
Asset Category:
Cash and cash equivalents						$	2					$	2					$	—					$	—
Mutual funds (1)						20						20						—						—
Total						$	22					$	22					$	—					$	—

(1)Comprised of approximately 100% equities as of December 31, 2023.

												Fair Value Measurements at December 31, 2022
						Fair Value Total						Level 1						Level 2						Level 3
Asset Category:
Cash and cash equivalents						$	2					$	2					$	—					$	—
Mutual funds (1)						18						18						—						—
Total						$	20					$	20					$	—					$	—

(1)Comprised of approximately 100% equities as of December 31, 2022.

The fair value of other postretirement plan assets by asset category at the dates indicated is as follows:

									Fair Value Measurements at December 31, 2023
			Fair Value Total						Level 1						Level 2						Level 3
Asset category:
Cash and cash equivalents			$	13					$	13					$	—					$	—
Mutual funds(1)			166						166						—						—
Fixed income securities			98						—						98						—
Total			$	277					$	179					$	98					$	—

(1)Primarily composed of market index funds as of December 31, 2023.

									Fair Value Measurements at December 31, 2022
			Fair Value Total						Level 1						Level 2						Level 3
Asset category:
Cash and cash equivalents			$	19					$	19					$	—					$	—
Mutual funds(1)			146						146						—						—
Fixed income securities			94						—						94						—
Total			$	259					$	165					$	94					$	—

(1)Primarily composed of market index funds as of December 31, 2022.

The Level 1 plan assets are valued based on active market quotes. The Level 2 plan assets are valued based on the net asset value per share (or its equivalent) of the investments, which was not determinable through publicly published sources but was calculated consistent with authoritative accounting guidelines.

Schedule of Expected Benefit Payments [Table Text Block]

Benefit Payments

The Partnership’s estimate of expected benefit payments, which reflect expected future service, as appropriate, in each of the next five years and in the aggregate for the five years thereafter are shown in the following table:

						Pension Benefits - Funded Plans						Pension Benefits - Unfunded Plans						Other Postretirement Benefits (Gross, Before Medicare Part D)
2024						$	1					$	3					$	14
2025						1						3						14
2026						1						2						13
2027						1						2						12
2028						1						2						32
2029 – 2033						7						5						23

Schedule of Net Benefit Costs [Table Text Block]

Components of Net Periodic Benefit Cost

			December 31, 2023												December 31, 2022
			Pension Benefits						Other Postretirement Benefits						Pension Benefits						Other Postretirement Benefits
Net periodic benefit cost:
Service cost			$	—					$	—					$	—					$	1
Interest cost			1						6						2						4
Expected return on plan assets			(1)						(12)						(2)						(11)
Prior service cost amortization			—						2						—						19
Actuarial gain amortization			—						(1)						—						—
Net periodic benefit cost			$	—					$	(5)					$	—					$	13

Defined Benefit Plan, Assumptions [Table Text Block]

The weighted-average assumptions used in determining benefit obligations at the dates indicated are shown in the following table:

			December 31, 2023												December 31, 2022
			Pension Benefits						Other Postretirement Benefits						Pension Benefits						Other Postretirement Benefits
Discount rate			2.70		%				4.62		%				5.00		%				2.46		%

The weighted-average assumptions used in determining net periodic benefit cost for the periods presented are shown in the following table:

			December 31, 2023												December 31, 2022
			Pension Benefits						Other Postretirement Benefits						Pension Benefits						Other Postretirement Benefits
Discount rate			2.70		%				4.93		%				2.70		%				2.58		%
Expected return on assets:
Tax exempt accounts			7.00		%				7.00		%				7.00		%				7.00		%
Taxable accounts			—						4.75		%				—						4.75		%

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