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Investments Equity Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Investment Income [Line Items]
Equity Method Investment, Other than Temporary Impairment	$ 150	$ 610	$ 30
Income (Loss) from Equity Method Investments	578	497	414
Income (loss) from Equity Method Investments, Net of Impairments	578	497	414
Amortization of excess costs	$ (61)	(59)	(51)
Citrus Corporation
Net Investment Income [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Income (Loss) from Equity Method Investments	$ 108	102	96
SNG
Net Investment Income [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Income (Loss) from Equity Method Investments	$ 77	58	0
Fayetteville Express
Net Investment Income [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Income (Loss) from Equity Method Investments	$ 53	51	55
Gulf LNG Holdings Group LLC
Net Investment Income [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Income (Loss) from Equity Method Investments	$ 47	48	49
Plantation Pipe Line Company
Net Investment Income [Line Items]
Equity Method Investment, Ownership Percentage	51.17%
Income (Loss) from Equity Method Investments	$ 46	37	29
Cortez Pipeline Company
Net Investment Income [Line Items]
Equity Method Investment, Ownership Percentage	52.98%
Equity Method Investment, Other than Temporary Impairment	$ 4	9	26
Income (Loss) from Equity Method Investments	44	24	(3)
Ruby Pipeline Holding Company LLC [Member]
Net Investment Income [Line Items]
Income (Loss) from Equity Method Investments	$ 44	15	18
Midcontinent Express Pipeline LLC
Net Investment Income [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Income (Loss) from Equity Method Investments	$ 38	40	45
EagleHawk Field Services
Net Investment Income [Line Items]
Equity Method Investment, Ownership Percentage	25.00%
Income (Loss) from Equity Method Investments	$ 24	10	24
Watco Companies LLC
Net Investment Income [Line Items]
Income (Loss) from Equity Method Investments	$ 19	25	16
Red Cedar Gathering company
Net Investment Income [Line Items]
Equity Method Investment, Ownership Percentage	49.00%
Equity Method Investment, Other than Temporary Impairment	$ 10
Income (Loss) from Equity Method Investments	$ 14	24	26
Fort Union Pipeline
Net Investment Income [Line Items]
Equity Method Investment, Ownership Percentage	37.04%
Equity Method Investment, Other than Temporary Impairment		7
Income (Loss) from Equity Method Investments	$ 10	1	16
NGPL Holdco LLC [Member]
Net Investment Income [Line Items]
Income (Loss) from Equity Method Investments	10	12	0
Liberty Pipeline
Net Investment Income [Line Items]
Income (Loss) from Equity Method Investments	$ 9	11	9
Bear Creek Storage
Net Investment Income [Line Items]
Equity Method Investment, Ownership Percentage	75.00%
Income (Loss) from Equity Method Investments	$ 8	2	0
Sierrita Pipeline LLC
Net Investment Income [Line Items]
Equity Method Investment, Ownership Percentage	35.00%
Income (Loss) from Equity Method Investments	$ 7	7	9
Double Eagle Pipeline LLC
Net Investment Income [Line Items]
Income (Loss) from Equity Method Investments	7	5	3
Parkway Pipeline LLC [Member]
Net Investment Income [Line Items]
Income (Loss) from Equity Method Investments	0	14	5
All Other Legal Entities [Member]
Net Investment Income [Line Items]
Income (Loss) from Equity Method Investments	$ 13	$ 11	$ 17

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