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Stockholders' Equity (Common Stock Repurchase Activity) (Details) - USD ($) shares in Millions | 12 Months Ended | 37 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Jan. 02, 2016 | Jan. 02, 2016 | Dec. 31, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of Shares Repurchased |  |  | 11.8 |
Dollar Value Repurchased |  |  | $ 1,200,000,000 |
Fiscal Year Authorized - 2014, Termination Date - December 2018 |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Dollar Value Authorized | $ 1,000,000,000.0 |  |  | $ 1,000,000,000
Number of Shares Repurchased | 0.1 | 2.4 |  |
Dollar Value Repurchased | $ 5,200,000 | $ 200,700,000 |  |
Fiscal Year Authorized - 2012, Termination Date - December 2016 |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Dollar Value Authorized | $ 1,000,000,000.0 |  |  |
Number of Shares Repurchased | 0.0 | 0.3 |  |
Dollar Value Repurchased | $ 0 | $ 28,800,000 |  |
Fiscal Year Authorized - 2010, Termination Date - none |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Dollar Value Authorized | $ 30,000,000 |  |  |
Number of Shares Repurchased | 0.0 | 0.0 |  |
Dollar Value Repurchased | $ 0 | $ 0 |  |

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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + 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=27012166&loc=d3e187085-122770 Reference 2: 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 3: 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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