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TAXES ON INCOME
 9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
TAXES ON INCOME TAXES ON INCOME    For the three months ended September 30, 2021 and 2020, the effective income tax rate was 23.4% and 23.7%, respectively. The effective income tax rate for the three months ended September 30, 2021, benefited from a $6 million income tax benefit associated with changes in reserves for uncertain tax positions, and $6 million of excess tax benefits associated with stock-based compensation. The effective income tax rate for the three months ended September 30, 2020, benefited from a lower effective income tax rate, 11.8%, associated with a $70 million gain recognized as a result of the remeasurement of the Company's previously held equity interest in Mid America Clinical Laboratories, LLC ("MACL") to fair value, and $3 million of excess tax benefits associated with stock-based compensation.    For the nine months ended September 30, 2021 and 2020, the effective income tax rate was 23.1% and 23.9%, respectively. For the nine months ended September 30, 2021, the effective income tax rate benefited from a lower effective income tax rate, 17.6%, on the gain on the sale of the Company's 40% ownership interest in Q2 Solutions (see Note 5). For the nine months ended September 30, 2020, the effective income tax rate benefited from a lower effective income tax rate, 11.8%, associated with a $70 million gain recognized as a result of the remeasurement of the Company's previously held equity interest in MACL to fair value. In addition, the effective income tax rate benefited from $15 million of excess tax benefits associated with stock-based compensation arrangements for both the nine months ended September 30, 2021 and 2020.