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Operating Segments - Reconciliation of Segment Profit (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Reconciliation of segment profit to net income attributable to PAA    
Segment profit $ 443 $ 513
Depreciation and amortization (114) (104)
Interest expense, net (112) (105)
Other income/(expense), net 5 (4)
INCOME BEFORE TAX 222 300
Income tax expense (19) (16)
NET INCOME 203 284
Net income attributable to noncontrolling interests (1) (1)
NET INCOME ATTRIBUTABLE TO PAA $ 202 $ 283