Non-Cash Compensation Plans Subsidiary Unit-Based Compensation Plans (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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	$ 22	$ 9	$ 0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 45
Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 4 months 1 day
Sunoco LP Unit Based Compensation Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested awards	2.1	1.7
Weighted Average Grant-Date Fair Value Per Unit	$ 29.15	$ 31.89
Awards granted	1.1
Weighted Average Grant-Date Fair Value Per Unit, Awards granted	$ 27.67	$ 28.31	$ 26.95
Awards vested	(0.4)
Weighted Average Grant-Date Fair Value Per Unit, Awards vested	$ 32.92
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0.3
Weighted Average Grant-Date Fair Value Per Unit, Awards forfeited	$ 31.26
USAC Unit Based Compensation Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested awards	1.4	1.0
Weighted Average Grant-Date Fair Value Per Unit	$ 14.98	$ 14.24
Awards granted	1.1
Weighted Average Grant-Date Fair Value Per Unit, Awards granted	$ 15.47
Awards vested	(0.6)
Weighted Average Grant-Date Fair Value Per Unit, Awards vested	$ 14.79
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0.1
Weighted Average Grant-Date Fair Value Per Unit, Awards forfeited	$ 17.85

Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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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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-Name Accounting Standards Codification
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- Definition

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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- Definition

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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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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- Definition

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.

+ References

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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