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Retirement Benefits Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2020

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

Obligations and Funded Status

Pension and other postretirement benefit liabilities are accrued on an actuarial basis during the years an employee provides services. 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, 2020																		December 31, 2019
			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			$	52					$	34					$	208					$	1					$	37					$	198
Service cost			—						—						1						—						—						1
Interest cost			2						1						5						2						1						7
Benefits paid, net			(2)						(5)						(16)						(1)						(7)						(16)
Actuarial (gain) loss and other			5						1						10						4						—						18
Settlements			(2)						—						—						(4)						—						—
SemGroup Acquisition			—						—						—						50						3						—
Benefit obligation at end of period			55						31						208						52						34						208
Change in plan assets:
Fair value of plan assets at beginning of period			43						—						270						1						—						241
Return on plan assets and other			5						—						28						6						—						35
Employer contributions			1						—						9						1						—						10
Benefits paid, net			(2)						—						(16)						(1)						—						(16)
Settlements			(2)						—						—						(4)						—						—
SemGroup Acquisition			—						—						—						40						—						—
Fair value of plan assets at end of period			45						—						291						43						—						270
Amount underfunded (overfunded) at end of period			$	10					$	31					$	(83)					$	9					$	34					$	(62)
Amounts recognized in the consolidated balance sheets consist of:
Non-current assets									$	—					$	108					$	—					$	—					$	88
Current liabilities			—						(4)						(2)						—						(5)						(2)
Non-current liabilities			(10)						(27)						(23)						(9)						(29)						(24)
			$	(10)					$	(31)					$	83					$	(9)					$	(34)					$	62
Amounts recognized in accumulated other comprehensive income (loss) (pre-tax basis) consist of:
Net actuarial gain (loss)			$	—					$	2					$	(18)					$	—					$	1					$	(5)
Prior service cost			—						—						21						—						—						40
			$	—					$	2					$	3					$	—					$	1					$	35

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, 2020																		December 31, 2019
			Pension Benefits																		Pension Benefits
			Funded Plans						Unfunded Plans						Other Postretirement Benefits						Funded Plans						Unfunded Plans						Other Postretirement Benefits
Projected benefit obligation			$	55					$	31					N/A						$	51					$	34					N/A
Accumulated benefit obligation			55						31						208						52						34						208
Fair value of plan assets			45						—						291						43						—						270

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 table below:

			December 31,
			2020						2019
Health care cost trend rate			7.30		%				7.25		%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)			4.82		%				4.83		%
Year that the rate reaches the ultimate trend rate			2027						2026

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, 2020
						Fair Value Total						Level 1						Level 2						Level 3
Asset Category:
Cash and cash equivalents						$	1					$	1					$	—					$	—
Mutual funds (1)						20						20						—						—
Fixed income securities						24						—						24						—
Total						$	45					$	21					$	24					$	—

(1)Comprised of approximately 100% equities as of December 31, 2020.

												Fair Value Measurements at December 31, 2019
						Fair Value Total						Level 1						Level 2						Level 3
Asset Category:
Cash and cash equivalents						$	1					$	1					$	—					$	—
Mutual funds (1)						19						19						—						—
Fixed income securities						23						—						23						—
Total						$	43					$	20					$	23					$	—

(1)Comprised of approximately 100% equities as of December 31, 2019.

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

									Fair Value Measurements at December 31, 2020
			Fair Value Total						Level 1						Level 2						Level 3
Asset category:
Cash and cash equivalents			$	18					$	18					$	—					$	—
Mutual funds(1)			202						202						—						—
Fixed income securities			71						—						71						—
Total			$	291					$	220					$	71					$	—

(1)Primarily comprised of approximately 59% equities, 40% fixed income securities and 1% cash as of December 31, 2020.

									Fair Value Measurements at December 31, 2019
			Fair Value Total						Level 1						Level 2						Level 3
Asset category:
Cash and cash equivalents			$	14					$	14					$	—					$	—
Mutual funds(1)			177						177						—						—
Fixed income securities			79						—						79						—
Total			$	270					$	191					$	79					$	—

(1)Primarily comprised of approximately 59% equities, 40% fixed income securities and 1% cash as of December 31, 2019.

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 table below:

Years						Pension Benefits - Funded Plans						Pension Benefits - Unfunded Plans						Other Postretirement Benefits (Gross, Before Medicare Part D)
2021						$	3					$	5					$	18
2022						4						4						18
2023						4						4						16
2024						4						3						15
2025						2						3						14
2026 – 2030						12						9						58

Schedule of Net Benefit Costs [Table Text Block]

Components of Net Periodic Benefit Cost

			December 31, 2020												December 31, 2019
			Pension Benefits						Other Postretirement Benefits						Pension Benefits						Other Postretirement Benefits
Net periodic benefit cost:
Service cost			$	—					$	1					$	—					$	1
Interest cost			3						5						3						7
Expected return on plan assets			(2)						(11)						(2)						(10)
Prior service cost amortization			—						19						—						26
Net periodic benefit cost			$	1					$	14					$	1					$	24

Defined Benefit Plan, Assumptions [Table Text Block]

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

			December 31, 2020												December 31, 2019
			Pension Benefits						Other Postretirement Benefits						Pension Benefits						Other Postretirement Benefits
Discount rate			2.40		%				2.04		%				4.00		%				2.71		%

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

			December 31, 2020												December 31, 2019
			Pension Benefits						Other Postretirement Benefits						Pension Benefits						Other Postretirement Benefits
Discount rate			3.05		%				2.94		%				3.33		%				3.76		%
Expected return on assets:
Tax exempt accounts			4.57		%				7.00		%				3.37		%				7.00		%
Taxable accounts			—						4.75		%				—						4.75		%

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