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Stockholders' Equity (Reconciliation of Common Stock Share Activity) (Details) - shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stockholders' Equity Note [Abstract] |  |  |
Common stock, beginning balance | 992,020,000 | 1,014,027,000 | 1,020,057,000
Common stock, issued | 5,932,000 | 8,103,000 | 14,370,000
Common stock, retired | (39,564,000) | (30,110,000) | (20,400,000)
Common stock, ending balance | 958,388,000 | 992,020,000 | 1,014,027,000
Held in treasury, beginning balance | (87,041,000) | (87,041,000) | (87,041,000)
Held in treasury, repurchased | (39,564,000) | (30,110,000) | (20,400,000)
Held in treasury, retired | 39,564,000 | 30,110,000 | 20,400,000
Held in treasury, ending balance | (87,041,000) | (87,041,000) | (87,041,000)

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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: 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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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + 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 210.5-02.28,29) -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 29, 30 -Article 5 + Details
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