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Non-Cash Compensation Plans Subsidiary Unit-Based Compensation Plans (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsidiary Unit Based Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value Of Units As Of The Vesting Date	$ 16	$ 17	$ 22
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 39
Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 7 months 6 days
Sunoco LP Unit Based Compensation Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested awards	2.1	2.1
Weighted Average Grant-Date Fair Value Per Unit	$ 28.63	$ 29.21
Awards granted	0.7
Weighted Average Grant-Date Fair Value Per Unit, Awards granted	$ 28.63	$ 30.70	$ 27.67
Awards vested	(0.5)
Weighted Average Grant-Date Fair Value Per Unit, Awards vested	$ 30.47
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0.2
Weighted Average Grant-Date Fair Value Per Unit, Awards forfeited	$ 29.11
USAC Unit Based Compensation Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested awards	2.1	1.8
Weighted Average Grant-Date Fair Value Per Unit	$ 14.88	$ 15.09
Awards granted	0.7
Weighted Average Grant-Date Fair Value Per Unit, Awards granted	$ 12.55	$ 15.88	$ 15.47
Awards vested	(0.2)
Weighted Average Grant-Date Fair Value Per Unit, Awards vested	$ 17.27
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0.2
Weighted Average Grant-Date Fair Value Per Unit, Awards forfeited	$ 15.36

X

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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