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Financial Instruments (Unaudited) (Details) (Commodity Contract [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Fair Value Hedging [Member] | Sales [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative financial instruments $ (12) $ (12)
Hedged item – firm sales commitments 12 12
Matured derivative financial instruments (2) (2)
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) (169) [1] (83) [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) 1 [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) (36) [1] 0 [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) $ (14) [1] $ 0 [1]
[1] Amounts recorded in revenues.
[2] Amounts recorded in cost of sales as production and delivery costs.