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Schedule Of Gains And Losses On Derivative Representing Either Hedge Ineffectiveness Or Hedge Components Excluded From Assessment Of Effectiveness Are Recognized In Current Earnings (Detail) (USD $)
In Millions, unless otherwise specified

3 Months Ended

6 Months Ended

Jun. 30, 2012

Jun. 30, 2011

Jun. 30, 2012

Jun. 30, 2011

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)

$ 2

^[1]

$ (1)

^[1]

$ 9

^[1]

Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)

2

^[2]

(42)

^[2]

1

^[2]

(82)

^[2]

Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)

140

104

58

(84)

Amount of loss expected to be recognized into earnings over the next 12 months

31

Amount of gain or (loss) recognized in earnings related to ineffective portion of hedging relationships

1

1

10

10

Earnings recognized in relation to amount excluded from the assessment of hedge effectiveness

1

1

(1)

(1)

Aluminum Contracts

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)

145

97

66

(92)

Aluminum Contracts | Sales

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)

2

^[2]

(38)

^[2]

2

^[2]

(76)

^[2]

Aluminum Contracts | Other Expenses (Income), Net

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)

2

^[1]

(1)

^[1]

9

^[1]

Energy Contracts

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)

8

(5)

8

Energy Contracts | Cost of Goods Sold

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)

(3)

^[2]

(6)

^[2]

Foreign Exchange Contract

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)

1

2

Foreign Exchange Contract | Sales

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)

1

^[2]

2

^[2]

Interest Rate Contract

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)

(2)

Interest Rate Contract | Interest Expense

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)

(1)

^[2]

(1)

^[2]

Interest Rate Contract | Other Expenses (Income), Net

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)

1

^[2]

(2)

^[2]

(2)

^[2]

Interest Rate Contract

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)

$ (3)

$ (2)

$ (3)

$ (2)

[1]

For the second quarter and six months ended June 30, 2012, the amount of gain or (loss) recognized in earnings represents $1 and $10, respectively, related to the ineffective portion of the hedging relationships. There was also $1 and $(1) recognized in earnings related to the amount excluded from the assessment of hedge effectiveness for the second quarter and six months ended June 30, 2012, respectively. For the second quarter and six months ended June 30, 2011, the amount of gain or (loss) recognized in earnings related to the ineffective portion of the hedging relationships.

[2]

Assuming market rates remain constant with the rates at June 30, 2012, a gain of $31 is expected to be recognized in earnings over the next 12 months.

X

- Definition

Derivative Instruments Gain Loss Recognized In Income Related To Ineffective Portion

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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