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Investments Equity investments (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) | Dec. 10, 2015
Investment [Line Items] |  |  |  |
Preferred stock, shares issued (in shares) | shares | 1,600,000 | 1,600,000 |  |
Payments to Acquire Equity Method Investments | $ 684 | $ 408 | $ 96 |
Long-term Investments | $ 7,298 | 7,027 |  |
Citrus Corporation |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Total equity investments | $ 1,698 | 1,709 |  |
SNG |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Total equity investments | $ 1,495 | 1,505 |  |
Ruby Pipeline Holding Company LLC [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Total equity investments | $ 774 | 798 |  |
NGPL Holdings, LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  | 50.00%
Total equity investments | $ 687 | 475 |  |
Gulf LNG Holdings Group LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Total equity investments | $ 461 | 485 |  |
Plantation Pipe Line Company |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 51.17% |  |  |
Total equity investments | $ 331 | 333 |  |
EagleHawk Field Services |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 25.00% |  |  |
Total equity investments | $ 314 | 329 |  |
Utopia Holding L.L.C. |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Total equity investments | $ 276 | 55 |  |
Midcontinent Express Pipeline LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Total equity investments | $ 253 | 328 |  |
Red Cedar Gathering company |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 49.00% |  |  |
Total equity investments | $ 187 | 191 |  |
Watco Companies LLC |  |  |  |
Investment [Line Items] |  |  |  |
Common Unit, Issued | shares | 13,000 |  |  |
Profit participation rate | 0.40% |  |  |
Total equity investments | $ 182 | 180 |  |
Watco Companies LLC | Preferred stock |  |  |  |
Investment [Line Items] |  |  |  |
Preferred stock, shares issued (in shares) | shares | 100,000 |  |  |
Quarterly preferred distribution rate | 3.25% |  |  |
Watco Companies LLC | Preferred Class B [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Preferred stock, shares issued (in shares) | 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] |  |  |  |
Total equity investments | $ 149 | 151 |  |
Fayetteville Express |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Total equity investments | $ 112 | 101 |  |
Liberty Pipeline |  |  |  |
Investment [Line Items] |  |  |  |
Total equity investments | $ 71 | 75 |  |
Bear Creek Storage Company L.L.C. |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 75.00% |  |  |
Total equity investments | $ 63 | 61 |  |
Sierrita Pipeline LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 35.00% |  |  |
Total equity investments | $ 55 | 57 |  |
Fort Union Pipeline |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 37.04% |  |  |
Total equity investments | $ 12 | 25 |  |
All Other Legal Entities [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Total equity investments | $ 178 | $ 169 |  |
Cortez Pipeline Company |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 52.98% |  |  |
Florida Gas Transmission Company, L.L.C. [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Miles Of Pipeline | 5,300 |  |  |
BHP Billiton Petroleum | EagleHawk Field Services |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 75.00% |  |  |
ONEOK Partners L.P. [Member] | Fort Union Pipeline |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 37.04% |  |  |
Powder River Midstream, LLC [Member] | Fort Union Pipeline |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 11.11% |  |  |
Western Gas Resources Inc [Member] | Fort Union Pipeline |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 14.81% |  |  |
MIT Pipeline Investment Americas, Inc. | Sierrita Pipeline LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 30.00% |  |  |
MGI Enterprises U.S. LLC | Sierrita Pipeline LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 35.00% |  |  |
Riverstone Investment Group LLC | Utopia Holding L.L.C. |  |  |  |
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% |  |  |
Pembina Pipeline Company [Member] | Ruby Pipeline Holding Company LLC [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Energy Transfers Partners L.P. | Citrus Corporation |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Energy Transfers Partners L.P. | Midcontinent Express Pipeline LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Southern Natural Gas Company 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 Ute Indian Tribe [Member] | Red Cedar Gathering company |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 51.00% |  |  |
Brookfield Infrastructure Partners L.P. | NGPL Holdings, LLC |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  | 50.00%
SNG | Bear Creek Storage Company L.L.C. |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 25.00% |  |  |
Cortez Vickers Pipeline Company [Member] | Cortez Pipeline Company |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 13.77% |  |  |
Mobil Cortez Pipeline Inc. [Member] | Cortez Pipeline Company |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 33.25% |  |  |
TGP [Member] | Bear Creek Storage Company L.L.C. |  |  |  |
Investment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |

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