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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 |  |

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