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Business Segments, Consolidated Revenues and Expenses (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Consolidated Revenues [Abstract]                      
Total consolidated revenues $ 13,101.3 $ 12,093.3 $ 11,149.3 $ 11,383.1 $ 11,072.1 $ 10,468.7 $ 9,789.8 $ 11,252.5 $ 47,727.0 $ 42,583.1 $ 44,313.0
Operating costs and expenses:                      
Cost of sales                 40,770.2 [1] 36,015.5 [1] 38,292.6 [1]
Other operating costs and expenses                 2,310.4 [2] 2,244.9 [2] 2,195.4 [2]
Depreciation, amortization and accretion                 1,148.9 1,061.7 958.7
Gains attributable to asset sales and insurance recoveries                 (83.4) (17.6) (156.0)
Non-cash asset impairment charges                 92.6 63.4 27.8
General and administrative costs                 188.3 170.3 181.8
Total consolidated costs and expenses                 44,427.0 39,538.2 41,500.3
BP [Member]
                      
Consolidated Revenues [Abstract]                      
Total consolidated revenues                 4,311.7    
NGL Pipelines and Services [Member]
                      
Consolidated Revenues [Abstract]                      
Sales of NGLs and related products                 15,916.0 14,218.5 16,724.6
Midstream services                 1,204.2 949.9 758.7
Total consolidated revenues                 17,120.2 15,168.4 17,483.3
NGL Pipelines and Services [Member] | BP [Member]
                      
Consolidated Revenues [Abstract]                      
Total consolidated revenues                 1,137.6    
Onshore Natural Gas Pipelines And Services [Member]
                      
Consolidated Revenues [Abstract]                      
Sales of natural gas                 2,571.6 2,395.4 2,866.5
Midstream services                 966.9 957.2 863.7
Total consolidated revenues                 3,538.5 3,352.6 3,730.2
Onshore Natural Gas Pipelines And Services [Member] | BP [Member]
                      
Consolidated Revenues [Abstract]                      
Total consolidated revenues                 164.3    
Onshore Crude Oil Pipelines and Services [Member]
                      
Consolidated Revenues [Abstract]                      
Sales of crude oil                 20,371.3 17,548.7 15,962.6
Midstream services                 279.1 113.0 98.5
Total consolidated revenues                 20,650.4 17,661.7 16,061.1
Onshore Crude Oil Pipelines and Services [Member] | BP [Member]
                      
Consolidated Revenues [Abstract]                      
Total consolidated revenues                 2,833.1    
Offshore Pipelines And Services [Member]
                      
Consolidated Revenues [Abstract]                      
Sales of natural gas                 0.5 0.4 1.1
Sales of crude oil                 5.7 3.3 9.4
Midstream services                 153.2 187.8 245.5
Total consolidated revenues                 159.4 191.5 256.0
Petrochemical and Refined Products Services [Member]
                      
Consolidated Revenues [Abstract]                      
Sales of petrochemicals and refined products                 5,568.8 5,470.9 6,000.6
Midstream services                 689.7 738.0 781.8
Total consolidated revenues                 6,258.5 6,208.9 6,782.4
Petrochemical and Refined Products Services [Member] | BP [Member]
                      
Consolidated Revenues [Abstract]                      
Total consolidated revenues                 $ 176.7    
[1] Cost of sales is a component of "Operating costs and expenses," as presented on our Statements of Consolidated Operations. Year-to-year fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.
[2] Represents cost of operating our plants, pipelines and other fixed assets, excluding depreciation, amortization and accretion charges.