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Defined Contribution and Deferred Compensation Plans (Deferred Compensation Plans Liabilities and Investment) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Notes to Financial Statements [Abstract]    
Total liabilities $ 495us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent $ 468us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
Investment held to fund liabilities $ 160us-gaap_DeferredCompensationPlanAssets [1] $ 153us-gaap_DeferredCompensationPlanAssets [1]
[1] Reported in other assets on our Consolidated Balance Sheets.