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Activity Related to Noncontrolling Interests (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
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Mar. 31, 2012
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Mar. 31, 2011
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| Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] | ||
| Balance at beginning of period | $ 73 | $ 68 |
| Acquired noncontrolling interests | 3 | 2 |
| Dividends attributable to noncontrolling interests | 0 | 0 |
| Net income attributable to noncontrolling interests | 0 | 0 |
| Balance at end of period | $ 76 | $ 70 |
| X | ||||||||||
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- Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Represents an increase in noncontrolling interest from issuance of additional equity interests to noncontrolling interest holders or the sale of a portion of the parent's controlling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The portion of net Income or Loss attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash outflow for the return on capital for noncontrolled interest in the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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