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Debt (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Senior secured hedged inventory facility maturing in August 2014
Dec. 31, 2011
Senior secured hedged inventory facility maturing in August 2014
Jun. 30, 2012
PAA senior unsecured revolving credit facility maturing in August 2016
Dec. 31, 2011
PAA senior unsecured revolving credit facility maturing in August 2016
Jun. 30, 2012
5.63% senior notes due December 2013
Dec. 31, 2011
5.63% senior notes due December 2013
Jun. 30, 2012
5.25% senior notes due June 2015
Dec. 31, 2011
5.25% senior notes due June 2015
Jun. 30, 2012
3.95% senior notes due September 2015
Dec. 31, 2011
3.95% senior notes due September 2015
Jun. 30, 2012
5.88% senior notes due August 2016
Dec. 31, 2011
5.88% senior notes due August 2016
Jun. 30, 2012
6.13% senior notes due January 2017
Dec. 31, 2011
6.13% senior notes due January 2017
Jun. 30, 2012
6.50% senior notes due May 2018
Dec. 31, 2011
6.50% senior notes due May 2018
Jun. 30, 2012
8.75% senior notes due May 2019
Dec. 31, 2011
8.75% senior notes due May 2019
Jun. 30, 2012
5.75% senior notes due January 2020
Dec. 31, 2011
5.75% senior notes due January 2020
Jun. 30, 2012
5.00% senior notes due February 2021
Dec. 31, 2011
5.00% senior notes due February 2021
Jun. 30, 2012
3.65% senior notes due June 2022
Mar. 31, 2012
3.65% senior notes due June 2022
Jun. 30, 2012
6.70% senior notes due May 2036
Dec. 31, 2011
6.70% senior notes due May 2036
Jun. 30, 2012
6.65% senior notes due January 2037
Dec. 31, 2011
6.65% senior notes due January 2037
Jun. 30, 2012
5.15% senior notes due June 2042
Mar. 31, 2012
5.15% senior notes due June 2042
Jun. 30, 2012
4.25% senior notes due September 2012
Dec. 31, 2011
4.25% senior notes due September 2012
Jun. 30, 2012
PNG senior unsecured credit facility
Dec. 31, 2011
PNG senior unsecured credit facility
Jun. 30, 2012
PNG GO Bond term loans
Dec. 31, 2011
PNG GO Bond term loans
Debt                                                                            
Debt instrument, interest rate (as a percent)             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% 5.00% 3.65% 3.65% 6.70% 6.70% 6.65% 6.65% 5.15% 5.15% 4.25% 4.25%        
Credit facility, interest rate (as a percent)     1.30% 1.50% 1.90% 1.60%                                                         2.10% 2.10%    
Term Loans, interest rate (as a percent)                                                                         1.50% 1.50%
Short-term debt:                                                                            
Total short-term debt $ 997 $ 679                                                                        
Credit Facility, Current     214 75 200 32                                                         80 68    
Other short-term debt 3 4                                                                        
Repayment period         1 year                                                           1 year      
Senior Notes, Current                                                                 500 500        
Long-term debt:                                                                            
Senior notes             250 250 150 150 400 400 175 175 400 400 600 600 350 350 500 500 600 600 750 750 250 250 600 600 500 500            
Senior notes, net of unamortized discounts 5,510 4,262                                                                        
Long-term debt under credit facilities                                                                     79 54    
Term Loans, amounts outstanding                                                                         200 200
Unamortized discount (15) (13)                                                                        
Long-term debt, other 4 4                                                                        
Total long-term debt 5,793 4,520                                                                        
Total debt $ 6,790 $ 5,199