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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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