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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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