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Derivatives and Other Financial Instruments - Schedule of Reconciliation of Activity for Derivative Contracts (Detail) - Jun. 30, 2015 - USD ($)
$ in Millions
Total
Total
Embedded Aluminum Derivative [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Assets, Beginning balance $ 201 $ 266
Fair value measurement, Assets, Sales 7 13
Fair value measurement, Assets, Cost of goods sold (24) (45)
Fair value measurement, Assets, Other income, net (2) (1)
Fair value measurement, Assets, Other comprehensive income (loss) 494 451
Fair value measurement, Assets, Purchases, sales, issuances, and settlements 0 0
Fair value measurement, Assets, Transfers into and/or out of Level 3 0 0
Fair value measurement, Assets, Foreign currency translation 4 (4)
Fair value measurement, Assets, Ending balance 680 680
Fair value measurement, Assets, Sales 0 0
Fair value measurement, Assets, Cost of goods sold 0 0
Fair value measurement, Assets, Other income, net (2) (1)
Fair value measurement, Liabilities, Beginning balance 425 376
Fair value measurement, Liabilities, Sales (5) (11)
Fair value measurement, Liabilities, Cost of goods sold 0 0
Fair value measurement, Liabilities, Other comprehensive income (loss) (122) (67)
Fair value measurement, Liabilities, Purchases, sales, issuances, and settlements 0 0
Fair value measurement, Liabilities, Transfers into and/or out of Level 3 0 0
Fair value measurement, Liabilities, Foreign currency translation 0 0
Fair value measurement, Liabilities, Ending balance 298 298
Fair value measurement, Liabilities, Sales 0 0
Fair value measurement, Liabilities, Cost of goods sold 0 0
Embedded Credit Derivative [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Liabilities, Beginning balance 16 18
Fair value measurement, Liabilities, Cost of goods sold 0 0
Fair value measurement, Liabilities, Other income, net 3 1
Fair value measurement, Liabilities, Purchases, sales, issuances, and settlements 0 0
Fair value measurement, Liabilities, Transfers into and/or out of Level 3 0 0
Fair value measurement, Liabilities, Foreign currency translation 0 0
Fair value measurement, Liabilities, Ending balance 19 19
Fair value measurement, Liabilities, Sales 0 0
Fair value measurement, Liabilities, Cost of goods sold 0 0
Fair value measurement, Liabilities, Other income, net 3 1
Energy Contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Assets, Beginning balance 8 2
Fair value measurement, Assets, Other comprehensive income (loss) (8) (2)
Fair value measurement, Assets, Purchases, sales, issuances, and settlements 0 0
Fair value measurement, Assets, Transfers into and/or out of Level 3 0 0
Fair value measurement, Assets, Sales 0 0
Fair value measurement, Assets, Cost of goods sold 0 0
Fair value measurement, Liabilities, Cost of goods sold 0 0
Fair value measurement, Liabilities, Other comprehensive income (loss) 9 9
Fair value measurement, Liabilities, Purchases, sales, issuances, and settlements 0 0
Fair value measurement, Liabilities, Transfers into and/or out of Level 3 0 0
Fair value measurement, Liabilities, Foreign currency translation 0 0
Fair value measurement, Liabilities, Ending balance 9 9
Fair value measurement, Liabilities, Sales 0 0
Fair value measurement, Liabilities, Cost of goods sold $ 0 $ 0