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Schedule II-Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts, USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Allowance for Doubtful Accounts
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| Valuation and Qualifying Accounts | |||
| Balance at beginning of period | $ 52 | $ 56 | $ 47 |
| Charges (credits) to cost and expenses | (4) | 6 | 9 |
| Charged to other accounts | (2) | (10) | |
| Balance at end of period | $ 46 | $ 52 | $ 56 |
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- Details
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- Definition
Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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