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Schedule Of Fair Values Of Outstanding Derivative Contracts Recorded As Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Derivative [Line Items]    
Fair value liability derivatives $ 681 [1] $ 737 [1]
Level 1
    
Derivative [Line Items]    
Fair value liability derivatives 72 64
Level 3
    
Derivative [Line Items]    
Fair value liability derivatives 579 630
Level 2
    
Derivative [Line Items]    
Fair value liability derivatives 30 44
Derivatives Designated as Hedging Instruments
    
Derivative [Line Items]    
Fair value liability derivatives 602 653
Derivatives Designated as Hedging Instruments | Other Current Liabilities | Aluminum Contracts | Level 3
    
Derivative [Line Items]    
Fair value liability derivatives 44 47
Derivatives Designated as Hedging Instruments | Other Current Liabilities | Energy Contracts | Level 1
    
Derivative [Line Items]    
Fair value liability derivatives 28 32
Derivatives Designated as Hedging Instruments | Other Noncurrent Liabilities And Deferred Credits | Aluminum Contracts | Level 1
    
Derivative [Line Items]    
Fair value liability derivatives 18 4
Derivatives Designated as Hedging Instruments | Other Noncurrent Liabilities And Deferred Credits | Aluminum Contracts | Level 3
    
Derivative [Line Items]    
Fair value liability derivatives 502 570
Derivatives Designated as Hedging Instruments | Other Noncurrent Liabilities And Deferred Credits | Energy Contracts | Level 3
    
Derivative [Line Items]    
Fair value liability derivatives 10  
Derivatives Not Designated as Hedging Instrument
    
Derivative [Line Items]    
Fair value liability derivatives 79 [2] 85 [2]
Derivatives Not Designated as Hedging Instrument | Other Current Liabilities | Aluminum Contracts | Level 1
    
Derivative [Line Items]    
Fair value liability derivatives 9 [2] 12 [2]
Derivatives Not Designated as Hedging Instrument | Other Current Liabilities | Aluminum Contracts | Level 2
    
Derivative [Line Items]    
Fair value liability derivatives 17 [2] 23 [2]
Derivatives Not Designated as Hedging Instrument | Other Current Liabilities | Embedded Credit Derivative | Level 2
    
Derivative [Line Items]    
Fair value liability derivatives 4 [2]  
Derivatives Not Designated as Hedging Instrument | Other Noncurrent Liabilities And Deferred Credits | Aluminum Contracts | Level 1
    
Derivative [Line Items]    
Fair value liability derivatives 1 [2] 1 [2]
Derivatives Not Designated as Hedging Instrument | Other Noncurrent Liabilities And Deferred Credits | Aluminum Contracts | Level 2
    
Derivative [Line Items]    
Fair value liability derivatives 13 [2] 21 [2]
Derivatives Not Designated as Hedging Instrument | Other Noncurrent Liabilities And Deferred Credits | Embedded Credit Derivative | Level 3
    
Derivative [Line Items]    
Fair value liability derivatives 35 [2] 28 [2]
Less margin posted | Other Current Liabilities | Aluminum Contracts | Level 1
    
Derivative [Line Items]    
Fair value liability derivatives   $ 1 [1]
[1] All margin posted is in the form of cash and is valued under a Level 1 technique. The levels that correspond to the margin posted in the table above reference the level of the corresponding liability for which it is posted. Alcoa elected to net the margin posted against the fair value amounts recognized for derivative instruments executed with the same counterparties under master netting arrangements.
[2] See the "Other" section within Note N for additional information on Alcoa's purpose for entering into derivatives not designated as hedging instruments and its overall risk management strategies.