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Debt (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Senior secured hedged inventory facility maturing in August 2013
Dec. 31, 2010
Senior secured hedged inventory facility maturing in August 2013
Dec. 31, 2011
PAA senior unsecured revolving credit facility maturing in August 2016
Dec. 31, 2010
PAA senior unsecured revolving credit facility maturing in August 2016
Dec. 31, 2011
4.25% senior notes due September 2012
Dec. 31, 2010
4.25% senior notes due September 2012
Feb. 07, 2011
7.75% senior notes due October 2012
Dec. 31, 2010
7.75% senior notes due October 2012
Dec. 31, 2011
5.63% senior notes due December 2013
Dec. 31, 2010
5.63% senior notes due December 2013
Dec. 31, 2011
5.25% senior notes due June 2015
Dec. 31, 2010
5.25% senior notes due June 2015
Dec. 31, 2011
3.95% senior notes due September 2015
Dec. 31, 2010
3.95% senior notes due September 2015
Dec. 31, 2011
5.88% senior notes due August 2016
Dec. 31, 2010
5.88% senior notes due August 2016
Dec. 31, 2011
6.13% senior notes due January 2017
Dec. 31, 2010
6.13% senior notes due January 2017
Dec. 31, 2011
6.50% senior notes due May 2018
Dec. 31, 2010
6.50% senior notes due May 2018
Dec. 31, 2011
8.75% senior notes due May 2019
Dec. 31, 2010
8.75% senior notes due May 2019
Dec. 31, 2011
5.75% senior notes due January 2020
Dec. 31, 2010
5.75% senior notes due January 2020
Dec. 31, 2011
5.00% senior notes due February 2021
Dec. 31, 2011
6.70% senior notes due May 2036
Dec. 31, 2010
6.70% senior notes due May 2036
Dec. 31, 2011
6.65% senior notes due January 2037
Dec. 31, 2010
6.65% senior notes due January 2037
Dec. 31, 2011
PNG senior unsecured credit facility
Dec. 31, 2010
PNG senior unsecured credit facility
Dec. 31, 2011
PNG GO Zone term loans
Debt                                                                    
Debt instrument, interest rate (as a percent)             4.25% 4.25% 7.75% 7.75% 5.63% 5.63% 5.25% 5.25% 3.95% 3.95% 5.88% 5.88% 6.13% 6.13% 6.50% 6.50% 8.75% 8.75% 5.75% 5.75% 5.00% 6.70% 6.70% 6.65% 6.65%      
Credit facility, interest rate (as a percent)     1.50% 2.10% 1.60% 0.70%                                                   2.10% 3.20% 1.50%
Short-term debt:                                                                    
Total short-term debt $ 679,000,000 $ 1,326,000,000                                                                
Credit Facility, Current     75,000,000 500,000,000 32,000,000 824,000,000                                                   68,000,000    
Other short-term debt 4,000,000 2,000,000                                                                
Repayment period (in years)         1 year 1 year                                                   1 year 1 year  
Senior Notes, Current             500,000,000                                                      
Long-term debt:                                                                    
Senior notes               500,000,000   200,000,000 250,000,000 250,000,000 150,000,000 150,000,000 400,000,000 400,000,000 175,000,000 175,000,000 400,000,000 400,000,000 600,000,000 600,000,000 350,000,000 350,000,000 500,000,000 500,000,000 600,000,000 250,000,000 250,000,000 600,000,000 600,000,000      
Senior notes, net of unamortized discounts 4,262,000,000 4,363,000,000                                                                
Long-term debt under credit facilities                                                               54,000,000 260,000,000 200,000,000
Unamortized premium/(discount), net (13,000,000) (12,000,000)                                                                
Long-term debt, other 4,000,000 8,000,000                                                                
Total long-term debt 4,520,000,000 4,631,000,000                                                                
Total debt $ 5,199,000,000 $ 5,957,000,000