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Debt (Details 2) (USD $)
1 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Aug. 31, 2013
Commercial Paper Program
Sep. 30, 2013
Commercial Paper Program
Aug. 31, 2013
Senior secured hedged inventory facility
Aug. 31, 2013
Senior unsecured revolving credit facility
Aug. 31, 2013
PNG senior unsecured revolving credit facility
Aug. 31, 2013
PNG GO Bond term loans
Sep. 30, 2013
PNG GO Bond term loans
Dec. 31, 2012
PNG GO Bond term loans
Sep. 30, 2013
Credit agreements and commercial paper program
Sep. 30, 2012
Credit agreements and commercial paper program
Sep. 30, 2013
Fixed rate senior notes
Dec. 31, 2012
Fixed rate senior notes
Aug. 31, 2013
3.85% senior notes due 2023
Debt                              
Debt instrument face value                         $ 7,000,000,000 $ 6,300,000,000 $ 700,000,000
Debt instrument fair value                         7,500,000,000 7,300,000,000  
Debt instrument, interest rate (as a percent)                             3.85%
Interest rate (as a percent)       0.25%         1.50% 1.50%          
Percentage of face value at which senior notes are sold                             99.792%
Maximum aggregate amount outstanding at any time     1,500,000,000                        
Extension period         2 years 2 years 1 year 1 year              
Total borrowings                     12,700,000,000 8,500,000,000      
Total repayments                     13,200,000,000 7,800,000,000      
Outstanding letters of credit $ 42,000,000 $ 24,000,000