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Derivatives and Risk Management Activities (Details 2) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2014
Interest Rate Derivatives
Jun. 30, 2014
10 forward starting interest rate swaps (30-year)
PAA
Cash flow hedge
contract
Apr. 23, 2014
Treasury locks entered into in anticipation of issuance of 4.70% senior notes due 2044
PAA
Apr. 30, 2014
Treasury locks entered into in anticipation of issuance of 4.70% senior notes due 2044
PAA
Cash flow hedge
Apr. 23, 2014
Treasury locks entered into in anticipation of issuance of 4.70% senior notes due 2044
PAA
Cash flow hedge
contract
Interest Rate Risk Hedging                  
Net deferred gains/(losses) from interest rate risk hedging included in AOCI $ (142) $ (97) $ (58) $ 79 $ (101)        
Number of interest rate derivatives (in contracts)           10     5
Notional amount of derivatives           250 250   250
Rate of fixed interest to be received on interest rate swap (as a percent)           3.60%     3.64%
Cash payment for (proceeds from) termination of interest rate swaps               $ 7