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Operating Segments (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Reconciliation of segment profit to net income attributable to Plains        
Segment profit $ 488 $ 485 $ 1,097 $ 1,233
Unallocated general and administrative expenses (1)   (2)  
Depreciation and amortization (100) (91) (197) (174)
Interest expense, net (85) (76) (166) (154)
Other income (expense), net 4 (1) 2 (1)
INCOME BEFORE TAX 306 317 734 904
Income tax expense (31) (18) (87) (70)
NET INCOME 275 299 647 834
Net income attributable to noncontrolling interests (260) (298) (618) (832)
NET INCOME ATTRIBUTABLE TO PAGP $ 15 $ 1 $ 29 $ 2