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Derivative Instruments, Hedging Activities and Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Mar. 31, 2013
Interest rate derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Forward Starting Swaps [Member]
Contract
Jun. 30, 2014
Interest rate derivatives [Member]
Derivatives in fair value hedging relationships [Member]
Senior Notes AA [Member]
Contract
Jul. 31, 2014
Interest rate derivatives [Member]
Derivatives in mark-to-market relationships [Member]
Undesignated Swaps [Member]
Contract
Jun. 30, 2014
Interest rate derivatives [Member]
Derivatives in mark-to-market relationships [Member]
Undesignated Swaps [Member]
Contract
Jun. 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
Jun. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Natural gas processing: Forecasted sales of NGLs [Member]
bbl
Jun. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Octane enhancement: Forecasted purchases of NGLs [Member]
bbl
Jun. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Octane enhancement: Forecasted sales of octane enhancement products [Member]
bbl
Jun. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
NGL marketing: Forecasted purchases of NGLs and related hydrocarbon products [Member]
bbl
Jun. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
NGL marketing: Forecasted sales of NGLs and related hydrocarbon products [Member]
bbl
Jun. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Refined products marketing: Forecasted purchases of refined products [Member]
bbl
Jun. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Refined products marketing: Forecasted sales of refined products [Member]
bbl
Jun. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Crude oil marketing: Forecasted purchases of crude oil [Member]
bbl
Jun. 30, 2014
Commodity derivatives [Member]
Derivatives in cash flow hedging relationships [Member]
Crude oil marketing: Forecasted sales of crude oil [Member]
bbl
Jun. 30, 2014
Commodity derivatives [Member]
Derivatives in fair value hedging relationships [Member]
Natural gas marketing: Natural gas storage inventory management activities [Member]
ft3
Jun. 30, 2014
Commodity derivatives [Member]
Derivatives in fair value hedging relationships [Member]
Refined products marketing: Refined products inventory management activities [Member]
bbl
Jun. 30, 2014
Commodity derivatives [Member]
Derivatives in mark-to-market relationships [Member]
Natural gas risk management activities [Member]
ft3
Jun. 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   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         2,200,000,000 [1],[2] 600,000 [1],[2],[3] 100,000 [1],[2] 1,600,000 [1],[2] 6,200,000 [1],[2] 7,600,000 [1],[2] 600,000 [1],[2] 1,000,000 [1],[2] 3,300,000 [1],[2] 5,000,000 [1],[2] 3,300,000,000 [1],[2] 200,000 [1],[2] 73,100,000,000 [1],[2],[4],[5] 13,200,000 [1],[2],[4]
Long Term Volume                                 12,600,000,000 [1],[2],[4],[5]  
Number of derivative instruments settled 16   6                              
Notional amount of settled derivative instruments 1,000   600                              
Accumulated other comprehensive income (loss) related to interest rate derivative instruments $ 168.8                                  
Accumulated Other Comprehensive Loss, Forecasted Hedging period 10 years                                  
Forecasted NGL sales designated as normal sales agreements           600,000                        
Current natural gas hedging volumes designated as an index plus or minus a discount                                 37,700,000,000  
[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 March 2015, August 2014 and October 2016, respectively.
[3] Forecasted sales of NGL volumes under natural gas processing exclude 0.6 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 volumes include 37.7 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.