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Retirement Benefits Retirement Benefits (Tables) | 12 Months Ended
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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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