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Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Line Items]
Defined Contribution Plan, Cost	$ 62	$ 59	$ 65
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 Benefit Payment, Next Twelve Months	$ 6
Other Postretirement Benefits
Retirement Benefits [Line Items]
Large Cap US Equitiies	53.00%	38.00%
Fixed Income Securities	46.00%	61.00%
Cash Fund Investments	1.00%	2.00%
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 10
Minimum [Member] | Other Postretirement Benefits | Equity [Member]
Retirement Benefits [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31)	0.25
Minimum [Member] | Other Postretirement Benefits | Fixed Income Investments [Member]
Retirement Benefits [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31)	0.65
Maximum [Member] | Other Postretirement Benefits | Equity [Member]
Retirement Benefits [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31)	0.35
Maximum [Member] | Other Postretirement Benefits | Fixed Income Investments [Member]
Retirement Benefits [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31)	0.75
Funded Plans [Member] | Pension Benefits
Retirement Benefits [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 1

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Percentage of mutual fund that is invested in cash.

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Retirement Benefits [Line Items]

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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Description of investment policy and strategy for defined benefit plan asset. Includes, but is not limited to, investment allocation decision and factor pertinent to understanding investment policy and strategy for plan asset. Factor includes, but is not limited to, investment goal, risk management practice, permitted and prohibited investment including use of derivative, diversification, and relationship between plan asset and obligation.

+ References

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-Publisher FASB
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Amount of cost for defined contribution plan.

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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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