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Other Assets - Summary of Other Assets (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Schedule Of Other Assets [Line Items] |  |
Preproduction costs related to long-term supply agreements with contractual guarantee for reimbursement | $ 297 | $ 301
Long-term receivables [note 20] | 95 | 176
Patents and licenses, net | 34 | 30
Unrealized gain on cash flow hedges [note 20] | 32 | 15
E-Car intangible [note 6] | 158 | 0
Other, net [note 6] | 137 | 72
Total other assets | $ 753 | $ 594

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