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Investments Equity investments (Details) $ in Millions | Sep. 01, 2019 | Jan. 01, 2019 | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($)
--- | --- | --- | --- | ---
Investment [Line Items] |  |  |  |
Long-term Investments |  |  | $ 7,481 | $ 7,298
Citrus Corporation |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Total equity investments |  |  | $ 1,708 | 1,698
SNG |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Total equity investments |  |  | $ 1,536 | 1,495
Ruby |  |  |  |
Investment [Line Items] |  |  |  |
Total equity investments |  |  | $ 750 | 774
NGPL Holdings, LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Total equity investments |  |  | $ 733 | 687
Gulf LNG Holdings Group LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Total equity investments |  |  | $ 361 | 461
Plantation Pipe Line Company |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 51.17% |
Total equity investments |  |  | $ 344 | 331
Utopia Holding L.L.C. |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Total equity investments |  |  | $ 333 | 276
EagleHawk |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 25.00% |
Total equity investments |  |  | $ 299 | 314
Gulf Coast Express LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 35.00% |
Total equity investments |  |  | $ 240 | 0
MEP |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Total equity investments |  |  | $ 235 | 253
Red Cedar Gathering company |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 49.00% |
Total equity investments |  |  | $ 191 | 187
Watco Companies, LLC |  |  |  |
Investment [Line Items] |  |  |  |
Common Unit, Issued | shares |  |  | 13,000 |
Profit participation rate |  |  | 0.40% |
Total equity investments |  |  | $ 185 | 182
Watco Companies, LLC | Preferred stock |  |  |  |
Investment [Line Items] |  |  |  |
Common Unit, Issued | shares |  |  | 100,000 |
Quarterly preferred distribution rate |  |  | 3.25% |
Watco Companies, LLC | Preferred Class B |  |  |  |
Investment [Line Items] |  |  |  |
Common Unit, Issued | shares |  |  | 50,000 |
Quarterly preferred distribution rate |  |  | 3.00% |
Watco Companies, LLC | Common Units |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 3.20% |
Double Eagle Pipeline LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Total equity investments |  |  | $ 140 | 149
Liberty Pipeline Group LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Total equity investments |  |  | $ 66 | 71
Bear Creek Storage |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 75.00% |
Total equity investments |  |  | $ 65 | 63
Sierrita Pipeline LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 35.00% |
Total equity investments |  |  | $ 55 | 55
Permian Highway Pipeline |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Total equity investments |  |  | $ 45 | 0
FEP |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Total equity investments |  |  | $ 44 | 112
Cortez Pipeline Company |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 52.98% |
All others |  |  |  |
Investment [Line Items] |  |  |  |
Total equity investments |  |  | $ 151 | $ 190
Energy Transfers Partners L.P. | Citrus Corporation |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Energy Transfers Partners L.P. | MEP |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Energy Transfers Partners L.P. | Liberty Pipeline Group LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Southern Natural Gas Company LLC | SNG |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Southern Natural Gas Company LLC | Bear Creek Storage |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Pembina Pipeline Company | Ruby |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Brookfield Infrastructure Partners L.P. | NGPL Holdings, LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
GE Energy Financial Services, The Blackstone Group L.P. and Others | Gulf LNG Holdings Group LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Riverstone Investment Group LLC | Utopia Holding L.L.C. |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
BHP Billiton Petroleum | EagleHawk |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 75.00% |
DCP GCX Pipeline LLC | Gulf Coast Express LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 25.00% |
Florida Gas Transmission Company, L.L.C. |  |  |  |
Investment [Line Items] |  |  |  |
Miles Of Pipeline |  |  | 5,300 |
Targa GCX Pipeline LLC | Gulf Coast Express LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 25.00% |
Altus Midstream Company | Gulf Coast Express LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 15.00% |
Southern Ute Indian Tribe | Red Cedar Gathering company |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 51.00% |
Magellan Midstream Partners | Double Eagle Pipeline LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
TGP | Bear Creek Storage |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
MGI Enterprises U.S. LLC | Sierrita Pipeline LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 35.00% |
MIT Pipeline Investment Americas, Inc. | Sierrita Pipeline LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 30.00% |
BCP PHP, LLC | Permian Highway Pipeline |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |
Mobil Cortez Pipeline Inc. | Cortez Pipeline Company |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 33.25% |
Cortez Vickers Pipeline Company | Cortez Pipeline Company |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 13.77% |
SNG | Bear Creek Storage |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 25.00% |
Subsequent Event | Permian Highway Pipeline |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 26.67% | 40.00% |  |
Subsequent Event | Altus Midstream Company | Permian Highway Pipeline |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 26.67% |  |  |
Subsequent Event | Anchor Shipper | Permian Highway Pipeline |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  | 20.00% |  |
Subsequent Event | BCP PHP, LLC | Permian Highway Pipeline |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 26.67% | 40.00% |  |

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