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Financial Instruments (Unaudited) (Details) (Commodity Contract [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Fair Value Hedging [Member] | Sales [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative financial instruments $ 12 $ (6) $ 0 $ (18)
Hedged item – firm sales commitments (12) 6 0 18
Matured derivative financial instruments (2) (13) (4) (14)
Derivatives not designated as hedging instruments [Member] | Embedded derivatives in provisional sales contracts [Member] | Sales [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized and unrealized gains (losses) 84 [1] (205) [1] (85) [1] (288) [1]
Derivatives not designated as hedging instruments [Member] | Copper forward contracts [Member] | Amounts recorded in Cost of Sales [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized and unrealized gains (losses) 4 [2] 0 [2] 5 [2] 3 [2]
Derivatives not designated as hedging instruments [Member] | Plains Exploration & Production Company [Member] | Crude Oil Options [Member] | Sales [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized and unrealized gains (losses) (68) [1] (54) [1] (104) [1] (54) [1]
Derivatives not designated as hedging instruments [Member] | Plains Exploration & Production Company [Member] | Natural gas swaps [Member] | Sales [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized and unrealized gains (losses) $ (2) [1] $ 19 [1] $ (16) [1] $ 19 [1]
[1] Amounts recorded in revenues.
[2] Amounts recorded in cost of sales as production and delivery costs.