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FAIR VALUE MEASUREMENTS - Summary of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets:
Total	$ 2,478	$ 2,026
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement
Assets:
Total	7,231	9,008
Liabilities:
Total	617	339
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | MYR GmbH
Liabilities:
Liability for MYR contingent consideration	341	0
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | U.S. treasury securities
Assets:
Total	464	309
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Certificates of deposit
Assets:
Total	358	216
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Non-U.S. government securities
Assets:
Total	62	43
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Corporate debt securities
Assets:
Total	1,247	1,142
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Residential mortgage and asset-backed securities
Assets:
Total	347	316
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Money market funds
Assets:
Marketable equity securities	2,216	4,361
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Equity investment in Galapagos
Assets:
Marketable equity securities	1,302	1,648
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Other publicly traded equity securities
Assets:
Marketable equity securities	968	743
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Deferred compensation plan
Assets:
Marketable equity securities	235	218
Liabilities:
Deferred compensation plan	235	218
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Foreign currency derivative contracts
Assets:
Foreign currency derivative contracts	32	12
Liabilities:
Foreign currency derivative contracts	41	121
Fair Value, Measurements, Recurring | Level 1
Assets:
Total	5,185	7,279
Liabilities:
Total	235	218
Fair Value, Measurements, Recurring | Level 1 | MYR GmbH
Liabilities:
Liability for MYR contingent consideration	0	0
Fair Value, Measurements, Recurring | Level 1 | U.S. treasury securities
Assets:
Total	464	309
Fair Value, Measurements, Recurring | Level 1 | Certificates of deposit
Assets:
Total	0	0
Fair Value, Measurements, Recurring | Level 1 | Non-U.S. government securities
Assets:
Total	0	0
Fair Value, Measurements, Recurring | Level 1 | Corporate debt securities
Assets:
Total	0	0
Fair Value, Measurements, Recurring | Level 1 | Residential mortgage and asset-backed securities
Assets:
Total	0	0
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Assets:
Marketable equity securities	2,216	4,361
Fair Value, Measurements, Recurring | Level 1 | Equity investment in Galapagos
Assets:
Marketable equity securities	1,302	1,648
Fair Value, Measurements, Recurring | Level 1 | Other publicly traded equity securities
Assets:
Marketable equity securities	968	743
Fair Value, Measurements, Recurring | Level 1 | Deferred compensation plan
Assets:
Marketable equity securities	235	218
Liabilities:
Deferred compensation plan	235	218
Fair Value, Measurements, Recurring | Level 1 | Foreign currency derivative contracts
Assets:
Foreign currency derivative contracts	0	0
Liabilities:
Foreign currency derivative contracts	0	0
Fair Value, Measurements, Recurring | Level 2
Assets:
Total	2,046	1,729
Liabilities:
Total	41	121
Fair Value, Measurements, Recurring | Level 2 | MYR GmbH
Liabilities:
Liability for MYR contingent consideration	0	0
Fair Value, Measurements, Recurring | Level 2 | U.S. treasury securities
Assets:
Total	0	0
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit
Assets:
Total	358	216
Fair Value, Measurements, Recurring | Level 2 | Non-U.S. government securities
Assets:
Total	62	43
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities
Assets:
Total	1,247	1,142
Fair Value, Measurements, Recurring | Level 2 | Residential mortgage and asset-backed securities
Assets:
Total	347	316
Fair Value, Measurements, Recurring | Level 2 | Money market funds
Assets:
Marketable equity securities	0	0
Fair Value, Measurements, Recurring | Level 2 | Equity investment in Galapagos
Assets:
Marketable equity securities	0	0
Fair Value, Measurements, Recurring | Level 2 | Other publicly traded equity securities
Assets:
Marketable equity securities	0	0
Fair Value, Measurements, Recurring | Level 2 | Deferred compensation plan
Assets:
Marketable equity securities	0	0
Liabilities:
Deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Level 2 | Foreign currency derivative contracts
Assets:
Foreign currency derivative contracts	32	12
Liabilities:
Foreign currency derivative contracts	41	121
Fair Value, Measurements, Recurring | Level 3
Assets:
Total	0	0
Liabilities:
Total	341	0
Fair Value, Measurements, Recurring | Level 3 | MYR GmbH
Liabilities:
Liability for MYR contingent consideration	341	0
Fair Value, Measurements, Recurring | Level 3 | U.S. treasury securities
Assets:
Total	0	0
Fair Value, Measurements, Recurring | Level 3 | Certificates of deposit
Assets:
Total	0	0
Fair Value, Measurements, Recurring | Level 3 | Non-U.S. government securities
Assets:
Total	0	0
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities
Assets:
Total	0	0
Fair Value, Measurements, Recurring | Level 3 | Residential mortgage and asset-backed securities
Assets:
Total	0	0
Fair Value, Measurements, Recurring | Level 3 | Money market funds
Assets:
Marketable equity securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Equity investment in Galapagos
Assets:
Marketable equity securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Other publicly traded equity securities
Assets:
Marketable equity securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Deferred compensation plan
Assets:
Marketable equity securities	0	0
Liabilities:
Deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign currency derivative contracts
Assets:
Foreign currency derivative contracts	0	0
Liabilities:
Foreign currency derivative contracts	$ 0	$ 0

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