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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of Stockholders' Equity [Abstract] |  |  |
Net earnings Attributable to noncontrolling interests | $ 3 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest | $ 3 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest | $ 3 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
Cash dividends declared | $ 2.00 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.84 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.70 us-gaap_CommonStockDividendsPerShareDeclared

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- Definition Aggregate dividends declared 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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Period Type: | duration

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- Definition Amount of Net Income (Loss) attributable to redeemable noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Period Type: | duration

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- Details
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