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Stockholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 14, 2014
Disclosure of Repurchase Agreements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid, per share (USD per share) | $ 0.75 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.75 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.75 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.625 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.625 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.625 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.625 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.50 us-gaap_CommonStockDividendsPerShareCashPaid | $ 2.88 us-gaap_CommonStockDividendsPerShareCashPaid | $ 2.38 us-gaap_CommonStockDividendsPerShareCashPaid | $ 2.00 us-gaap_CommonStockDividendsPerShareCashPaid |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  | $ 500 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock repurchased during period, shares |  |  |  |  |  |  |  |  | 165,900 us-gaap_StockRepurchasedDuringPeriodShares |  |  |
Stock repurchased during period, value |  |  |  |  |  |  |  |  | 25 us-gaap_StockRepurchasedDuringPeriodValue |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 475 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |  |  |  |  |  | $ 475 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 + Details
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- Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 Reference 3: 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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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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