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Restructuring Charges - Summary of Significant Activity and Components of Restructuring Obligations (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Restructuring Cost and Reserve [Line Items] | |||||||||||
| Beginning Balance | $ 99 | $ 97 | |||||||||
| Expense | 99 | 58 | (33) | ||||||||
| Utilized | (29) | [1] | (54) | [1] | |||||||
| Other changes | 1 | [2],[3] | (2) | [2] | |||||||
| Ending Balance | 170 | 99 | 97 | ||||||||
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Personnel lay-off costs [Member]
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| Restructuring Cost and Reserve [Line Items] | |||||||||||
| Beginning Balance | 98 | 87 | |||||||||
| Expense | 97 | 58 | |||||||||
| Utilized | (29) | [1] | (45) | [1] | |||||||
| Other changes | 1 | [2] | (2) | [2] | |||||||
| Ending Balance | 167 | 98 | |||||||||
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Lease and Contract Terminations [Member]
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| Restructuring Cost and Reserve [Line Items] | |||||||||||
| Beginning Balance | 1 | 10 | |||||||||
| Expense | 2 | ||||||||||
| Utilized | [1] | (9) | [1] | ||||||||
| Other changes | [2] | [2] | |||||||||
| Ending Balance | $ 3 | $ 1 | |||||||||
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