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STOCK COMPENSATION PLANS (Schedule of Options Outstanding and Exercisable at December 31, 2013, by Range of Exercise Prices) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Options Outstanding and Exercisable at December 31, 2013, by Range of Exercise Prices  
Number Outstanding 3.3us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Options outstanding, weighted-average remaining contractual life (in years) 5 years 7 months
Options outstanding, weighted-average exercise price $ 81.07us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
Options exercisable 2.7us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Options exercisable, weighted-average exercise price $ 80.84us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Exercise Price Range 1 [Member]  
Options Outstanding and Exercisable at December 31, 2013, by Range of Exercise Prices  
Exercise price range, lower range limit $ 6.80us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Exercise price range, upper range limit $ 59.37us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
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Number Outstanding 0.1us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= lh_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRange01Member
Options outstanding, weighted-average remaining contractual life (in years) 1 year
Options outstanding, weighted-average exercise price $ 57.59us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Options exercisable 0.1us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
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Options exercisable, weighted-average exercise price $ 57.59us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= lh_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRange01Member
Exercise Price Range 2 [Member]  
Options Outstanding and Exercisable at December 31, 2013, by Range of Exercise Prices  
Exercise price range, lower range limit $ 59.38us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Exercise price range, upper range limit $ 67.60us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
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Number Outstanding 0.2us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= lh_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRange02Member
Options outstanding, weighted-average remaining contractual life (in years) 3 years 11 months
Options outstanding, weighted-average exercise price $ 60.51us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Options exercisable 0.2us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= lh_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRange02Member
Options exercisable, weighted-average exercise price $ 60.51us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= lh_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRange02Member
Exercise Price Range 3 [Member]  
Options Outstanding and Exercisable at December 31, 2013, by Range of Exercise Prices  
Exercise price range, lower range limit $ 67.61us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Exercise price range, upper range limit $ 75.63us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
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Number Outstanding 0.7us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Options outstanding, weighted-average remaining contractual life (in years) 4 years 6 months
Options outstanding, weighted-average exercise price $ 71.99us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Options exercisable 0.7us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= lh_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRange03Member
Options exercisable, weighted-average exercise price $ 71.99us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= lh_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRange03Member
Exercise Price Range 4 [Member]  
Options Outstanding and Exercisable at December 31, 2013, by Range of Exercise Prices  
Exercise price range, lower range limit $ 75.64us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= lh_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRange04Member
Exercise price range, upper range limit $ 80.37us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Number Outstanding 0.3us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Options outstanding, weighted-average remaining contractual life (in years) 2 years 5 months
Options outstanding, weighted-average exercise price $ 80.03us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Options exercisable 0.3us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= lh_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRange04Member
Options exercisable, weighted-average exercise price $ 80.03us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= lh_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRange04Member
Exercise Price Range 5 [Member]  
Options Outstanding and Exercisable at December 31, 2013, by Range of Exercise Prices  
Exercise price range, lower range limit $ 80.38us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= lh_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRange05Member
Exercise price range, upper range limit $ 98.49us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Number Outstanding 2.0us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Options outstanding, weighted-average remaining contractual life (in years) 6 years 9 months
Options outstanding, weighted-average exercise price $ 87.43us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Options exercisable 1.4us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Options exercisable, weighted-average exercise price $ 88.35us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
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