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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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