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Partners' Capital and Distributions (Details 8) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Partners' Capital and Distributions
Net income attributable to Plains	$ 278	$ 281	$ 225	$ 182	$ 142	$ 81	$ 131	$ 151	$ 966	$ 505	$ 579
Transfers to the noncontrolling interests:
Increase in capital from sale of PNG units									64	101
Decrease in capital from sale of interest in SLC Pipeline											(38)
Change from net income attributable to Plains and net transfers to the noncontrolling interest									1,030	606	541
Changes in the noncontrolling interests in partners' capital
Beginning balance				231					231
Sale of noncontrolling interest in a subsidiary (Note 5)									370	268	26
Net income attributable to noncontrolling interests									28	9	1
Equity compensation expense (Note 10)									28	16	5
Ending Balance	524				231				524	231
LTIP Vesting
LTIP unit vestings, fair value									24	26	19
Noncontrolling Interests
Changes in the noncontrolling interests in partners' capital
Beginning balance				231				63	231	63
Sale of noncontrolling interest in a subsidiary (Note 5)									306	167	64
Net income attributable to noncontrolling interests									28	9	1
Distribution to noncontrolling interest									(40)	(10)	(2)
Equity compensation expense (Note 10)									3	3
Net deferred loss on cash flow hedges									(4)
Other										(1)
Ending Balance	524				231				524	231	63
PNG Long Term Incentive Plan Awards
LTIP Vesting
LTIP awards, issued (in units)									242,762
LTIP unit vestings, fair value									$ 15

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