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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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- Definition Percentage of mutual fund that is invested in fixed income securities. + References No definition available. + Details
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- Definition Percentage of mutual fund that is invested in large-cap U.S. equities. + References No definition available. + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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