Percentage of mutual fund that is invested in cash.

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- Definition

Percentage of mutual fund that is invested in fixed income securities.

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- Definition

Percentage of mutual fund that is invested in large-cap U.S. equities.

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- Definition

Retirement Benefits [Line Items]

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- Definition

Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

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- Definition

Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

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- Definition

Percentage of investment to total investment within defined benefit plan asset category.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of cost for defined contribution plan.

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- Definition

Amount of liability, recognized in statement of financial position, for defined benefit other postretirement plan, classified as noncurrent. Excludes pension plan.

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Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Line Items]
Defined Contribution Plan, Cost	$ 66	$ 62	$ 59
Sunoco [Member]
Retirement Benefits [Line Items]
Liability, Other Postretirement Defined Benefit Plan, Noncurrent	$ 200
Pension Benefits
Retirement Benefits [Line Items]
Large Cap US Equitiies	100.00%	100.00%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 7
Other Postretirement Benefits
Retirement Benefits [Line Items]
Large Cap US Equitiies	59.00%	53.00%
Fixed Income Securities	40.00%	46.00%
Cash Fund Investments	1.00%	1.00%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 8
Minimum [Member] \| Other Postretirement Benefits \| Equity [Member]
Retirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	25.00%
Minimum [Member] \| Other Postretirement Benefits \| Fixed Income Investments [Member]
Retirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	65.00%
Maximum [Member] \| Other Postretirement Benefits \| Equity [Member]
Retirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	35.00%
Maximum [Member] \| Other Postretirement Benefits \| Fixed Income Investments [Member]
Retirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	75.00%
Funded Plans [Member] \| Pension Benefits
Retirement Benefits [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 1