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SCHEDULE II. Valuation And Qualifying Accounts | 12 Months Ended
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Dec. 31, 2012
Valuation And Qualifying Accounts [Abstract] |
SCHEDULE II. Valuation And Qualifying Accounts | SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS for the years ended December 31, 2012, 2011 and 2010 (In Millions)
Column A |  | Column B |  |  | Column C |  |  | Column D |  |  | Column E |
|  | Balance at Beginning of Period |  |  | Additions |  |  | Deductions |  |  | Balance at End of Period |
Description |  |  | Charged to Costs and Expenses |  |  | Charged to Other Accounts |  |  |
Allowances for doubtful accounts, deducted from accounts receivable in the balance sheet: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  | $ | 29 |  |  | $ | 11 |  |  | $ | — |  |  | $ | (9) | (a) |  | $ | 31 |
2011 |  | $ | 34 |  |  | $ | 8 |  |  | $ | — |  |  | $ | (13) | (a) |  | $ | 29 |
2010 |  | $ | 39 |  |  | $ | 15 |  |  | $ | — |  |  | $ | (19) | (a) |  | $ | 34 |
Valuation Allowance on deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  | $ | 688 |  |  | $ | 113 |  |  | $ | (14) | (b) |  | $ | — |  |  | $ | 787 |
2011 |  | $ | 462 |  |  | $ | 178 |  |  | $ | 48 | (b) |  | $ | — |  |  | $ | 688 |
2010 |  | $ | 43 |  |  | $ | 400 |  |  | $ | 19 | (b) |  | $ | — |  |  | $ | 462 |
(a) | Deductions, representing uncollectible accounts written off, less recoveries of accounts written off in prior years.
(b) | Valuation allowance on deferred tax assets recorded primarily in other comprehensive income and paid in capital.

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: 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=6881521&loc=d3e24092-122690 + Details
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