BUSINESS SEGMENTS - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2011 mi MMbbl Entity
Segment Reporting Information [Line Items]
Number of business segments	5
Owned and operated pipeline, approximate miles	6,100
Aggregate storage capacity	64
Contract operation of third-party pipeline, approximate miles	2,800
Energy Services
Segment Reporting Information [Line Items]
Aggregate storage capacity	1.0
Number of refined petroleum products terminals	5
Pipelines & Terminals
Segment Reporting Information [Line Items]
Owned and operated pipeline, approximate miles	6,100
Number of refined petroleum products terminals	100
Pipelines & Terminals | Jetties and subsea pipelines
Segment Reporting Information [Line Items]
Number of states	16
Pipelines & Terminals | Terminals
Segment Reporting Information [Line Items]
Number of states	21
Aggregate storage capacity	37.4
International Operations
Segment Reporting Information [Line Items]
Aggregate storage capacity	26.1
Number of refined petroleum products terminals	2
Natural Gas Storage
Segment Reporting Information [Line Items]
Aggregate storage capacity	30
Development & Logistics
Segment Reporting Information [Line Items]
Contract operation of third-party pipeline, approximate miles	2,800