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Derivative Instruments, Hedging Activities and Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended
Mar. 31, 2013
Interest rate derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Forward Starting Swaps [Member]
Contract
Oct. 14, 2014
Interest rate derivatives [Member]
Derivatives in fair value hedging relationships [Member]
Oct. 31, 2014
Interest rate derivatives [Member]
Derivatives in fair value hedging relationships [Member]
Senior Notes AA [Member]
Contract
Sep. 30, 2014
Interest rate derivatives [Member]
Derivatives in fair value hedging relationships [Member]
Senior Notes AA [Member]
Contract
Oct. 14, 2014
Interest rate derivatives [Member]
Derivatives in fair value hedging relationships [Member]
Senior Notes AA [Member]
Oct. 31, 2014
Interest rate derivatives [Member]
Derivatives in fair value hedging relationships [Member]
Senior Notes LL [Member]
Contract
Oct. 14, 2014
Interest rate derivatives [Member]
Derivatives in fair value hedging relationships [Member]
Senior Notes LL [Member]
Jul. 31, 2014
Interest rate derivatives [Member]
Derivatives in mark-to-market relationships [Member]
Undesignated Swaps [Member]
Contract
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Natural gas processing: Forecasted natural gas purchases for plant thermal reduction (PTR) [Member]
ft3
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Natural gas processing: Forecasted sales of NGLs [Member]
bbl
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Octane enhancement: Forecasted purchases of NGLs [Member]
bbl
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Octane enhancement: Forecasted sales of octane enhancement products [Member]
bbl
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Natural gas marketing: Forecasted sales of natural gas [Member]
ft3
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
NGL marketing: Forecasted purchases of NGLs and related hydrocarbon products [Member]
bbl
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
NGL marketing: Forecasted sales of NGLs and related hydrocarbon products [Member]
bbl
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Refined products marketing: Forecasted purchases of refined products [Member]
bbl
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Refined products marketing: Forecasted sales of refined products [Member]
bbl
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Crude oil marketing: Forecasted purchases of crude oil [Member]
bbl
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Crude oil marketing: Forecasted sales of crude oil [Member]
bbl
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in fair value hedging relationships [Member]
Natural gas marketing: Natural gas storage inventory management activities [Member]
ft3
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in mark-to-market relationships [Member]
Natural gas risk management activities [Member]
ft3
Sep. 30, 2014
Commodity derivatives [Member]
Derivatives in mark-to-market relationships [Member]
Crude oil risk management activities [Member]
bbl
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)       1.20%                                    
Current Volume                 1,100,000,000 [1],[2] 300,000 [1],[2],[3] 300,000 [1],[2] 200,000 [1],[2] 1,700,000,000 [1],[2] 5,200,000 [1],[2] 8,800,000 [1],[2] 700,000 [1],[2] 1,300,000 [1],[2] 5,000,000 [1],[2] 7,000,000 [1],[2] 5,100,000,000 [1],[2] 63,500,000,000 [1],[2],[4],[5] 6,700,000 [1],[2],[4]
Long Term Volume                           100,000 [1],[2]       500,000 [1],[2] 500,000 [1],[2]   15,300,000,000 [1],[2],[4],[5]  
Number of derivative instruments settled 16   10     16   6                            
Notional amount of settled derivative instruments 1,000.0   750.0     800.0   600.0                            
Loss (gain) recognized due to settlement of derivative instruments   (27.6)     (17.6)   (10.0)                              
Accumulated other comprehensive income (loss) related to interest rate derivative instruments $ 168.8                                          
Forecasted NGL sales designated as normal sales agreements                   300,000                        
Current natural gas hedging volumes designated as an index plus or minus a discount                                         28,900,000,000  
Long-term natural gas hedging volumes designated as an index plus or minus a discount                                         900,000,000  
[1] 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.
[2] 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 2015, October 2015 and March 2018, respectively.
[3] Forecasted sales of NGL volumes under natural gas processing exclude 0.3 MMBbls of additional hedges executed under contracts that have been designated as normal sales agreements.
[4] Reflects the use of derivative instruments to manage risks associated with transportation, processing and storage assets.
[5] Current and long-term volumes include 28.9 Bcf and 0.9 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.