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SHAREHOLDERS' EQUITY - Reconciliation of Number of Shares of Common Stock (Detail) |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Mar. 31, 2013 Common Stock | Mar. 31, 2012 Common Stock | Mar. 31, 2013 Treasury Stock | Mar. 31, 2012 Treasury Stock
Common Stock Issued [Roll Forward] |  |  |  |  |  |  |
Balance, beginning of period | 665,778,000 | 665,239,000 |  | 665,239,000 | 663,639,000 |  |
Exercise of stock options and issuance of restricted shares |  |  |  | 539,000 | 798,000 |  |
Balance, end of period | 665,778,000 | 665,239,000 |  | 665,778,000 | 664,437,000 |  |
Treasury Stock [Roll Forward] |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  |  | 197,453,000 | 197,329,000
Open market |  |  |  |  |  | 2,979,000 | 0
Other |  |  |  |  |  | 124,000 | 199,000
Shares issued to AFL Stock Plan |  |  |  |  |  | (364,000) | (381,000)
Exercise of stock options |  |  |  |  |  | (294,000) | (39,000)
Other |  |  |  |  |  | (145,000) | (134,000)
Balance, end of period |  |  |  |  |  | 199,753,000 | 196,974,000
Shares outstanding, end of period | 466,025,000 |  | 467,463,000 |  |  |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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