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Partners' Capital and Distributions (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net Income attributable to Plains
Net income attributable to Plains	$ 292	$ 378	$ 821	$ 609
Transfers to the noncontrolling interests:
Increase in capital from sale of PNG units			30
Changes in the noncontrolling interests in partners' capital
Beginning balance			509
Net income attributable to noncontrolling interests	300	386	837	624
Equity-indexed compensation expense			20
Other comprehensive income/(loss):
Reclassification adjustments			(16)
Net deferred gain/(loss) on cash flow hedges			62
Issuance of PNG common units			30
Ending Balance	531		531
Partners' Capital Excluding Noncontrolling Interests
Net Income attributable to Plains
Net income attributable to Plains	292	378	821	609
Transfers to the noncontrolling interests:
Increase in capital from sale of PNG units	6		6
Change from net income attributable to Plains and net transfers to the noncontrolling interest	298	378	827	609
Changes in the noncontrolling interests in partners' capital
Net income attributable to noncontrolling interests			821
Equity-indexed compensation expense			18
Other comprehensive income/(loss):
Issuance of PNG common units	6		6
Noncontrolling Interests
Transfers to the noncontrolling interests:
Increase in capital from sale of PNG units			24
Changes in the noncontrolling interests in partners' capital
Beginning balance			509	524
Net income attributable to noncontrolling interests			16	15
Distribution to noncontrolling interest			(24)	(24)
Equity-indexed compensation expense			2	1
Other comprehensive income/(loss):
Reclassification adjustments			6	(7)
Net deferred gain/(loss) on cash flow hedges			(2)	1
Issuance of PNG common units			24
Ending Balance	$ 531	$ 510	$ 531	$ 510

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