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Fair Value Measurement (Unaudited) Unobservable Inputs (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Liability $ 223 $ 20
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Liability 195 [1] 0 [1],[2]
Plains Offshore Warrants [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Liability 79 0
Derivative financial instruments assumed in the PXP acquisition 79  
Net unrealized losses included in earnings related to assets and liabilities still held at the end of the period 0 [3]  
Crude Oil Options [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Liability 116 0
Derivative financial instruments assumed in the PXP acquisition 83  
Net unrealized losses included in earnings related to assets and liabilities still held at the end of the period $ 33 [3]  
Crude Oil Options [Member] | Minimum [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Deferred Premium Price 5.15  
Crude Oil Options [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value Assumptions, Expected Volatility Rate 18.00%  
Crude Oil Options [Member] | Maximum [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Deferred Premium Price 7.22  
Crude Oil Options [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value Assumptions, Expected Volatility Rate 62.00%  
Crude Oil Options [Member] | Weighted Average [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Deferred Premium Price 6.35  
Crude Oil Options [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value Assumptions, Expected Volatility Rate 23.00%  
[1] Recorded at fair value.
[2] Crude oil options are net of $478 million for deferred premiums and accrued interest at June 30, 2013. Refer to Note 9 for further discussion and balance sheet classifications.
[3] Realized and unrealized (losses) gains are recorded in revenue. There were no realized gains for the six months ended June 30, 2013.