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Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
ETP [Member] |  |  |
Retirement Benefits [Line Items] |  |  |
Defined Contribution Plan, Cost Recognized | $ 44 | $ 40 | $ 50
Sunoco [Member] |  |  |
Retirement Benefits [Line Items] |  |  |
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent | $ 200 |  |
Pension Benefits |  |  |
Retirement Benefits [Line Items] |  |  |
Large Cap US Equitiies | 100.00% | 100.00% |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | $ 12 |  |
Other Postretirement Benefits (Gross, Before Medicare Part D) [Member] |  |  |
Retirement Benefits [Line Items] |  |  |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | $ 26 |  |
Other Postretirement Benefits |  |  |
Retirement Benefits [Line Items] |  |  |
Large Cap US Equitiies | 31.00% | 56.00% |
Fixed Income Securities | 66.00% | 33.00% |
Cash Fund Investments | 3.00% | 11.00% |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | $ 10 |  |
Other Postretirement Benefits | Equity [Member] |  |  |
Retirement Benefits [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 25.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 35.00% |  |
Other Postretirement Benefits | Fixed Income Investments [Member] |  |  |
Retirement Benefits [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 65.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 75.00% |  |
Other Postretirement Benefits | Cash [Member] |  |  |
Retirement Benefits [Line Items] |  |  |
Defined Benefit Plan, Target Allocation Percentage, Cash Maximum | 10.00% |  |

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- Definition Percentage of mutual fund that is invested in cash. + References No definition available. + Details
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- Definition Target allocation maximum percentage of investments in cash securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position. + References No definition available. + Details
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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 from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 + Details
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