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Other Current Assets - Other Current Assets (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Other Current Assets [Line Items] |  |
Receivables from government agencies | $ 156 | $ 152
Taxes and other government receivables | 68 | 77
Advances | 84 | 118
Prepayments | 74 | 46
Loans and deposits | 15 | 14
Interest receivable | 1 | 4
Derivative instruments | 36 | 2
Receivables from equity-method investments | 16 | 20
Other current assets | 68 | 73
Total | $ 518 | $ 506

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