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Derivative Instruments, Hedging Activities and Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2012 Derivatives in cash flow hedging relationships [Member] Forward Starting Swaps [Member] Contract | Dec. 31, 2011 Derivatives in cash flow hedging relationships [Member] Forward Starting Swaps [Member] Contract | Dec. 31, 2011 Derivatives in cash flow hedging relationships [Member] Treasury Rate Locks [Member] Contract | Dec. 31, 2012 Interest rate derivatives [Member] Derivatives in cash flow hedging relationships [Member] Forward Starting Swaps [Member] Contract | Dec. 31, 2013 Interest rate derivatives [Member] Derivatives in fair value hedging relationships [Member] Senior Notes AA [Member] Contract | Dec. 31, 2012 Interest rate derivatives [Member] Derivatives in fair value hedging relationships [Member] Interest Rate Swap [Member] Contract | Dec. 31, 2013 Interest rate derivatives [Member] Derivatives in mark-to-market relationships [Member] Undesignated Swaps [Member] Contract | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in cash flow hedging relationships [Member] Natural gas processing: Forecasted natural gas purchases for plant thermal reduction (PTR) [Member] ft3 | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in cash flow hedging relationships [Member] Natural gas processing: Forecasted sales of NGLs [Member] bbl | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in cash flow hedging relationships [Member] Octane enhancement: Forecasted purchases of NGLs [Member] bbl | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in cash flow hedging relationships [Member] Octane enhancement: Forecasted sales of octane enhancement products [Member] bbl | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in cash flow hedging relationships [Member] Natural gas marketing: Forecasted sales of natural gas [Member] ft3 | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in cash flow hedging relationships [Member] NGL marketing: Forecasted purchases of NGLs and related hydrocarbon products [Member] bbl | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in cash flow hedging relationships [Member] NGL marketing: Forecasted sales of NGLs and related hydrocarbon products [Member] bbl | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in cash flow hedging relationships [Member] Refined products marketing: Forecasted purchases of refined products [Member] bbl | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in cash flow hedging relationships [Member] Refined products marketing: Forecasted sales of refined products [Member] bbl | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in cash flow hedging relationships [Member] Crude oil marketing: Forecasted purchases of crude oil [Member] bbl | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in cash flow hedging relationships [Member] Crude oil marketing: Forecasted sales of crude oil [Member] bbl | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in fair value hedging relationships [Member] Natural gas marketing: Natural gas storage inventory management activities [Member] ft3 | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in fair value hedging relationships [Member] Refined products marketing: Refined products inventory management activities [Member] bbl | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in mark-to-market relationships [Member] Natural gas risk management activities [Member] ft3 | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in mark-to-market relationships [Member] Refined products risk management activities [Member] bbl | Dec. 31, 2013 Commodity derivatives [Member] Derivatives in mark-to-market relationships [Member] Crude oil risk management activities [Member] bbl
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected offset percentage of change in fair value derivative instrument (in hundredths) | 80.00% | 125.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Derivatives Outstanding |  |  |  |  |  |  | 10 |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Type of Derivatives Outstanding |  |  |  |  |  |  | fixed-to-floating swaps |  | floating-to-fixed swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | $ 750.0 |  | $ 600.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of Hedge |  |  |  |  |  |  | 1/2011 to 2/2016 |  | 5/2010 to 7/2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate Swap, fixed rate (in hundredths) |  |  |  |  |  |  | 3.20% |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate Swap, floating rate (in hundredths) |  |  |  |  |  |  | 1.20% |  | 0.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current Volume |  |  |  |  |  |  |  |  |  | 7,000,000,000 | [1],[2] | 1,100,000 | [1],[2] | 400,000 | [1],[2] | 3,100,000 | [1],[2] | 2,600,000,000 | [1],[2] | 5,900,000 | [1],[2] | 5,400,000 | [1],[2] | 600,000 | [1],[2] | 1,600,000 | [1],[2] | 4,000,000 | [1],[2] | 5,800,000 | [1],[2] | 8,200,000,000 | [1],[2] | 100,000 | [1],[2] | 94,700,000,000 | [1],[2],[3],[4] | 800,000 | [1],[2],[3] | 14,400,000 | [1],[2],[3]
Long Term Volume |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | [1],[2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,700,000,000 | [1],[2],[3],[4] |  |  |  |
Accounting Treatment |  |  |  |  |  |  |  |  |  | Cash flow hedge |  | Cash flow hedge |  | Cash flow hedge |  | Cash flow hedge |  | Cash flow hedge |  | Cash flow hedge |  | Cash flow hedge |  | Cash flow hedge |  | Cash flow hedge |  | Cash flow hedge |  | Cash flow hedge |  | Fair value hedge |  | Fair value hedge |  | Mark-to-market |  | Mark-to-market |  | Mark-to-market |
Number of derivative instruments settled |  |  | 17 | 3 | 2 | 16 |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of settled derivative instruments |  |  | 850.0 | 250.0 | 1,230.0 | 1,000.0 |  | 800.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss (gain) recognized due to settlement of derivative instruments |  |  |  |  |  |  |  | 37.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) related to interest rate derivative instruments |  |  | $ 185.5 | $ 5.8 | $ 17.4 | $ 168.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Loss, Forecasted Hedging period |  |  | 10 years | 10 years | 25 years | 10 years |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current natural gas hedging volumes designated as an index plus or minus a discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,500,000,000 |  |  |  |  |
[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 January 2015, May 2014 and October 2016, 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] | Reflects the use of derivative instruments to manage risks associated with transportation, processing and storage assets.
[4] | Current volumes include 27.5 Bcf of physical derivative instruments that are predominantly priced at a marked-based index plus a premium or minus a discount related to location differences.

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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. + Details
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- Definition The period of hedges of the derivative instruments employed related to the noted item. + References No definition available. + Details
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- Definition The derivative instruments entered into in connection with natural gas risk management activities by the entity. Represents the short term contracts that are priced as an index plus a premium or minus a discount. + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) related to the increase (decrease) in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective. + References No definition available. + Details
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- Definition The volumes expected to be settled at least one year after the date indicated in accordance with derivative instruments. + References No definition available. + Details
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- Definition The notional value of derivative instruments terminated during the period. + References No definition available. + Details
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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 + Details
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- Definition Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective fair value hedge that is amortized upon discontinuation of the fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 35 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6439857&loc=d3e75592-113984 + Details
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- Definition Description of the hedged item related to the derivative. Includes the type of instrument hedged, contract amount, term, and so forth. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579240-113959 + Details
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- Definition The number of derivative instruments of a particular group held by the entity. + 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=7476318&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=7476318&loc=SL5579245-113959 + Details
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- Definition Description of the types of interest rate derivative instruments used. For example, swaps, caps, floors, collars, and so forth. + References 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 + Details
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