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EARNINGS PER SHARE (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share, Basic and Diluted [Abstract]    
Net income attributable to Quest Diagnostics $ 61us-gaap_NetIncomeLoss $ 104us-gaap_NetIncomeLoss
Less: Earnings allocated to participating securities   1dgx_EarningsAllocatedToNonvestedShareBasedPaymentAwards
Earnings available to Quest Diagnostics' common stockholders - basic and diluted $ 61dgx_EarningsAvailableToCompanysCommonStockholdersBasicAndDiluted $ 103dgx_EarningsAvailableToCompanysCommonStockholdersBasicAndDiluted
Weighted average common shares outstanding - basic 144us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 144us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Stock options and performance share units 2us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average common shares outstanding - diluted 146us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 145us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic (per share) $ 0.42us-gaap_EarningsPerShareBasic $ 0.72us-gaap_EarningsPerShareBasic
Diluted (per share) $ 0.42us-gaap_EarningsPerShareDiluted $ 0.71us-gaap_EarningsPerShareDiluted
Stock options and performance share units not included due to their antidilutive effect 1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 6us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount