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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Derivative [Line Items] |  |  |  |  |
Accumulated other comprehensive income (loss) related to interest rate derivative instruments | $ (383.0) | [1] | $ (329.0) | [1] |
Senior Notes AA [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of Derivatives Outstanding | 10 |  |  |  |
Type of Derivatives Outstanding | fixed-to-floating swaps |  |  |  |
Notional Amount | 750.0 |  |  |  |
Period of Hedge | 1/2011 to 2/2016 |  |  |  |
Rate Swap, fixed rate (in hundredths) | 3.20% |  |  |  |
Rate Swap, floating rate (in hundredths) | 1.30% |  |  |  |
Accounting Treatment | Fair value hedge |  |  |  |
Undesignated Swaps [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of Derivatives Outstanding | 6 |  |  |  |
Type of Derivatives Outstanding | floating-to-fixed swaps |  |  |  |
Notional Amount | 600.0 |  |  |  |
Period of Hedge | 5/2010 to 7/2014 |  |  |  |
Rate Swap, fixed rate (in hundredths) | 2.00% |  |  |  |
Rate Swap, floating rate (in hundredths) | 0.40% |  |  |  |
Accounting Treatment | Mark-to-market |  |  |  |
Future Debt Offering Tranche Three [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of Derivatives Outstanding | 16 |  |  |  |
Type of Derivatives Outstanding | forward starting swaps |  |  |  |
Notional Amount | 1,000.0 |  |  |  |
Expected Termination Date | 3/2013 |  |  |  |
Average Rate Locked (in hundredths) | 3.70% |  |  |  |
Accounting Treatment | Cash flow hedge |  |  |  |
Octane enhancement: Forecasted purchases of NGLs [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 1.3 | [2],[3] |  |  |
Accounting Treatment | Cash flow hedge |  |  |  |
Octane enhancement: Forecasted sales of octane enhancement products [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 2.8 | [2],[3] |  |  |
Long Term Volume | 0.1 | [2],[3] |  |  |
Accounting Treatment | Cash flow hedge |  |  |  |
Natural gas marketing: Forecasted sales of natural gas [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 3,200,000,000.0 | [2],[3] |  |  |
Accounting Treatment | Cash flow hedge |  |  |  |
Natural gas marketing: Natural gas storage inventory management activities [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 16,200,000,000.0 | [2],[3] |  |  |
Accounting Treatment | Fair value hedge |  |  |  |
NGL marketing: Forecasted purchases of NGLs and related hydrocarbon products [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 2.6 | [2],[3] |  |  |
Accounting Treatment | Cash flow hedge |  |  |  |
NGL marketing: Forecasted sales of NGLs and related hydrocarbon products [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 5.5 | [2],[3] |  |  |
Accounting Treatment | Cash flow hedge |  |  |  |
Refined products marketing: Forecasted purchases of refined products [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 0.8 | [2],[3] |  |  |
Accounting Treatment | Cash flow hedge |  |  |  |
Refined products marketing: Forecasted sales of refined products [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 1.3 | [2],[3] |  |  |
Accounting Treatment | Cash flow hedge |  |  |  |
Refined products marketing: Refined products inventory management activities [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 0.1 | [2],[3] |  |  |
Accounting Treatment | Fair value hedge |  |  |  |
Crude oil marketing: Forecasted purchases of crude oil [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 3.1 | [2],[3] |  |  |
Accounting Treatment | Cash flow hedge |  |  |  |
Crude oil marketing: Forecasted sales of crude oil [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 6.2 | [2],[3] |  |  |
Accounting Treatment | Cash flow hedge |  |  |  |
Natural gas risk management activities [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 138,600,000,000.0 | [2],[3],[4],[5] |  |  |
Long Term Volume | 24,700,000,000.0 | [2],[3],[4],[5] |  |  |
Accounting Treatment | Mark-to-market |  |  |  |
Current natural gas hedging volumes designated as an index plus or minus a discount | 39,300,000,000 | [5] |  |  |
Refined products risk management activities [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 0.8 | [2],[3],[4] |  |  |
Accounting Treatment | Mark-to-market |  |  |  |
Crude oil risk management activities [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current Volume | 3.9 | [2],[3],[4] |  |  |
Accounting Treatment | Mark-to-market |  |  |  |
Derivatives in cash flow hedging relationships [Member] | Forward Starting Swaps [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of derivative instruments settled | 17 |  | 3 |  | 1
Notional amount of settled derivative instruments | 850.0 |  | 250.0 |  | 50.0
Accumulated other comprehensive income (loss) related to interest rate derivative instruments | (185.5) |  | (5.8) |  | 1.3
Derivatives in cash flow hedging relationships [Member] | Treasury Rate Locks [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of derivative instruments settled |  |  | 2 |  |
Notional amount of settled derivative instruments |  |  | 1,230.0 |  |
Accumulated other comprehensive income (loss) related to interest rate derivative instruments |  |  | (17.4) |  |
Derivatives in fair value hedging relationships [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of derivative instruments settled | 11 |  |  |  |
Notional amount of settled derivative instruments | 800.0 |  |  |  |
Loss (gain) recognized due to settlement of derivative instruments | $ (37.7) |  |  |  |
[1] | See Note 6 for additional information regarding our derivative instruments.
[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] | 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 2014, October 2013 and October 2015, respectively.
[4] | Reflects the use of derivative instruments to manage risks associated with transportation, processing and storage assets.
[5] | Current volumes include 39.3 Bcf of physical derivative instruments that are predominantly priced at an index plus a premium or minus a discount related to location differences.

X
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- Definition The average rate locked on the treasury lock instrument derivatives. Treasury locks hedge the underlying U.S. treasury rates related to forecasted issuances of debt. + References No definition available. + Details
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- Definition The expected termination date of the derivative instruments employed related to the noted item. + 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 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 24 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6881521&loc=d3e23780-122690 + Details
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