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ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Schedule of Accounts Payable and Accrued Expenses) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts Payable and Accrued Liabilities [Abstract]      
Trade accounts payable $ 257us-gaap_AccountsPayableTradeCurrent $ 258us-gaap_AccountsPayableTradeCurrent  
Accrued wages and benefits, including incentive compensation 364us-gaap_EmployeeRelatedLiabilitiesCurrent 283us-gaap_EmployeeRelatedLiabilitiesCurrent  
Income taxes payable 63us-gaap_AccruedIncomeTaxesCurrent 7us-gaap_AccruedIncomeTaxesCurrent  
Accrued interest 67us-gaap_InterestPayableCurrent 61us-gaap_InterestPayableCurrent  
Accrued insurance 59us-gaap_AccruedInsuranceCurrent 30us-gaap_AccruedInsuranceCurrent  
Merger consideration payable 56dgx_MergerConsiderationPayableCurrent 1dgx_MergerConsiderationPayableCurrent  
Dividend payable 48us-gaap_DividendsPayableCurrentAndNoncurrent 43us-gaap_DividendsPayableCurrentAndNoncurrent 48us-gaap_DividendsPayableCurrentAndNoncurrent
Accrued expenses 277dgx_AccruedExpenses 237dgx_AccruedExpenses  
Accounts payable and accrued expenses $ 1,191us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 920us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent