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Common Stock and Stock Plans, Shares Reserved, Issued and Authorized (Details)
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Dec. 31, 2012
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Dec. 31, 2011
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|---|---|---|
| Reserved, Issued and Authorized Common Stock [Abstract] | ||
| Common stock, total shares reserved | 763,040,463 | |
| Common Stock, Shares, Issued | 5,481,811,474 | 5,358,522,061 |
| Common stock, shares not reserved | 2,755,148,063 | |
| Total shares authorized | 9,000,000,000 | 9,000,000,000 |
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Dividend Reinvestment and Common Stock Purchase Plans [Member]
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| Reserved, Issued and Authorized Common Stock [Abstract] | ||
| Common stock, total shares reserved | 4,818,377 | |
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Director Plans [Member]
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| Reserved, Issued and Authorized Common Stock [Abstract] | ||
| Common stock, total shares reserved | 1,215,481 | |
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Stock Plan [Member]
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| Reserved, Issued and Authorized Common Stock [Abstract] | ||
| Common stock, total shares reserved | 652,061,838 | |
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Convertible Securities and Warrants [Member]
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| Reserved, Issued and Authorized Common Stock [Abstract] | ||
| Common stock, total shares reserved | 104,944,767 |