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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2013
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS (In millions)
Column A |  | Column B |  |  | Column C |  |  | Column D |  |  | Column E |
Description |  | Balance at Beginning of Period |  |  | Additions Charged to Costs & Expenses |  |  | Charged to Other Accounts* |  |  | Deductions |  |  | Balance at End of Period |
Allowance for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2013 |  | $ | 18 |  |  | $ | 1 |  |  | $ | 0 |  |  | $ | 1 |  |  | $ | 18 |
Year ended December 31, 2012 |  | $ | 13 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | 0 |  |  | $ | 18 |
Year ended December 31, 2011 |  | $ | 9 |  |  | $ | 5 |  |  | $ | 0 |  |  | $ | 1 |  |  | $ | 13 |
Deferred tax valuation allowance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2013 |  | $ | 9 |  |  | $ | 4 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 13 |
Year ended December 31, 2012 |  | $ | 0 |  |  | $ | 9 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 9 |
Year ended December 31, 2011 |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |
* | The allowance for doubtful accounts increased by $3 million for the year ended December 31, 2012 due to reserves from acquired entities

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration