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Derivative Instruments, Hedging Activities and Fair Value Measurements (Details)
bbl in Millions, $ in Millions

3 Months Ended

Mar. 31, 2017

USD ($)

Contract

bbl

Bcf

Interest Rate Swaps Hedging Senior Notes OO [Member] | Derivatives in fair value hedging relationships [Member]

Derivative [Line Items]

Number of Derivatives Outstanding | Contract

10

Type of Derivatives Outstanding

fixed-to-floating swaps

Notional Amount | $

$ 750.0

Period of Hedge

5/2015 to 5/2018

Rate Swap, fixed rate

1.65%

Rate Swap, floating rate

1.51%

Forward Starting Swaps B [Member] | Derivatives in cash flow hedging relationships [Member]

Derivative [Line Items]

Number of Derivatives Outstanding | Contract

4

Type of Derivatives Outstanding

forward starting swaps

Notional Amount | $

$ 275.0

Expected Termination Date

May 01, 2018

Average Rate Locked

2.02%

Designated as Hedging Instrument [Member] | Natural gas processing: Forecasted natural gas purchases for plant thermal reduction (PTR) [Member] | Derivatives in cash flow hedging relationships [Member]

Derivative [Line Items]

Current Volume | Bcf

14.9

^[1],[2]

Designated as Hedging Instrument [Member] | Natural gas processing: Forecasted sales of NGLs [Member] | Derivatives in cash flow hedging relationships [Member]

Derivative [Line Items]

Current Volume

3.5

^[1],[2]

Designated as Hedging Instrument [Member] | Octane enhancement: Forecasted purchases of NGLs [Member] | Derivatives in cash flow hedging relationships [Member]

Derivative [Line Items]

Current Volume

0.5

^[1],[2]

Designated as Hedging Instrument [Member] | Octane enhancement: Forecasted sales of octane enhancement products [Member] | Derivatives in cash flow hedging relationships [Member]

Derivative [Line Items]

Current Volume

0.8

^[1],[2]

Designated as Hedging Instrument [Member] | Natural gas marketing: Forecasted purchases of natural gas for fuel [Member] | Derivatives in cash flow hedging relationships [Member]

Derivative [Line Items]

Current Volume | Bcf

4.5

^[1],[2]

Designated as Hedging Instrument [Member] | Natural gas marketing: Natural gas storage inventory management activities [Member] | Derivatives in fair value hedging relationships [Member]

Derivative [Line Items]

Current Volume | Bcf

4.5

^[1],[2]

Designated as Hedging Instrument [Member] | NGL marketing: Forecasted purchases of NGLs and related hydrocarbon products [Member] | Derivatives in cash flow hedging relationships [Member]

Derivative [Line Items]

Current Volume

82.3

^[1],[2]

Designated as Hedging Instrument [Member] | NGL marketing: Forecasted sales of NGLs and related hydrocarbon products [Member] | Derivatives in cash flow hedging relationships [Member]

Derivative [Line Items]

Current Volume

93.4

^[1],[2]

Designated as Hedging Instrument [Member] | Refined products marketing: Forecasted purchases of refined products [Member] | Derivatives in cash flow hedging relationships [Member]

Derivative [Line Items]

Current Volume

0.2

^[1],[2]

Designated as Hedging Instrument [Member] | Refined products marketing: Forecasted sales of refined products [Member] | Derivatives in cash flow hedging relationships [Member]

Derivative [Line Items]

Current Volume

0.4

^[1],[2]

Designated as Hedging Instrument [Member] | Refined products marketing: Refined products inventory management activities [Member] | Derivatives in fair value hedging relationships [Member]

Derivative [Line Items]

Current Volume

5.4

^[1],[2]

Designated as Hedging Instrument [Member] | Crude oil marketing: Forecasted purchases of crude oil [Member] | Derivatives in cash flow hedging relationships [Member]

Derivative [Line Items]

Current Volume

12.5

^[1],[2]

Designated as Hedging Instrument [Member] | Crude oil marketing: Forecasted sales of crude oil [Member] | Derivatives in cash flow hedging relationships [Member]

Derivative [Line Items]

Current Volume

21.2

^[1],[2]

Not Designated as Hedging Instrument [Member] | Natural gas risk management activities [Member] | Derivatives in mark-to-market relationships [Member]

Derivative [Line Items]

Current Volume | Bcf

188.6

^{[1],[2],[3],[4]}

Long Term Volume | Bcf

21.7

^{[1],[2],[3],[4]}

Current natural gas hedging volumes designated as an index plus or minus a discount | Bcf

55.3

Long-term natural gas hedging volumes designated as an index plus or minus a discount | Bcf

10.5

Not Designated as Hedging Instrument [Member] | Refined products risk management activities [Member] | Derivatives in mark-to-market relationships [Member]

Derivative [Line Items]

Current Volume

0.2

^[1],[2],[4]

Not Designated as Hedging Instrument [Member] | NGL risk management activities [Member] | Derivatives in mark-to-market relationships [Member]

Derivative [Line Items]

Current Volume

16.1

^[1],[2],[4]

Not Designated as Hedging Instrument [Member] | Crude oil risk management activities [Member] | Derivatives in mark-to-market relationships [Member]

Derivative [Line Items]

Current Volume

25.2

^[1],[2],[4]

Long Term Volume

10.4

^[1],[2],[4]

[1]	The maximum term for derivatives designated as cash flow hedges, derivatives designated as fair value hedges and derivatives not designated as hedging instruments is December 2017, September 2017 and March 2020, respectively.
[2]	Volume for derivatives designated as hedging instruments reflects the total amount of volumes hedged whereas volume for derivatives not designated as hedging instruments reflects the absolute value of derivative notional volumes.
[3]	Current and long-term volumes include 55.3 Bcf and 10.5 Bcf, respectively, of physical derivative instruments that are predominantly priced at a marked-based index plus a premium or minus a discount related to location differences.
[4]	Reflects the use of derivative instruments to manage risks associated with transportation, processing and storage assets.

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- Definition

The volumes expected to be settled within one year after the date indicated in accordance with derivative instruments.

+ References

No definition available.

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- Definition

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- Definition

The volumes expected to be settled at least one year after the date indicated in accordance with derivative instruments.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Average stated rate on a group of interest rate forward or futures contracts.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

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Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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