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FAIR VALUE MEASUREMENTS - Summary of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Other publicly traded equity securities
Assets:
Total	$ 4,774		$ 6,970
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement
Assets:
Total	7,318		9,008
Liabilities:
Total	585		339
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | MYR GmbH
Liabilities:
Liability for MYR GmbH (“MYR”) contingent consideration	328		0
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | U.S. treasury securities
Assets:
Available-for-sale debt securities	360		309
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | U.S. government agencies securities
Assets:
Available-for-sale debt securities	5		0
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Non-U.S. government securities
Assets:
Available-for-sale debt securities	44		43
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Certificates of deposit
Assets:
Available-for-sale debt securities	361		216
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Corporate debt securities
Assets:
Available-for-sale debt securities	1,272		1,142
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Residential mortgage and asset-backed securities
Assets:
Available-for-sale debt securities	447		316
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Money market funds
Assets:
Marketable equity securities	2,768		4,361
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Equity investment in Galapagos
Assets:
Marketable equity securities	881		1,648
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Other publicly traded equity securities
Assets:
Marketable equity securities	876		743
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Other publicly traded equity securities | Arcus
Assets:
Marketable equity securities	482		212
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Deferred compensation plan
Assets:
Marketable equity securities	249		218
Liabilities:
Deferred compensation plan	249		218
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Foreign currency derivative contracts
Assets:
Foreign currency derivative contracts	55		12
Liabilities:
Foreign currency derivative contracts	8		121
Fair Value, Measurements, Recurring | Level 1
Assets:
Total	5,134		7,279
Liabilities:
Total	249		218
Fair Value, Measurements, Recurring | Level 1 | MYR GmbH
Liabilities:
Liability for MYR GmbH (“MYR”) contingent consideration	0		0
Fair Value, Measurements, Recurring | Level 1 | U.S. treasury securities
Assets:
Available-for-sale debt securities	360		309
Fair Value, Measurements, Recurring | Level 1 | U.S. government agencies securities
Assets:
Available-for-sale debt securities	0		0
Fair Value, Measurements, Recurring | Level 1 | Non-U.S. government securities
Assets:
Available-for-sale debt securities	0		0
Fair Value, Measurements, Recurring | Level 1 | Certificates of deposit
Assets:
Available-for-sale debt securities	0		0
Fair Value, Measurements, Recurring | Level 1 | Corporate debt securities
Assets:
Available-for-sale debt securities	0		0
Fair Value, Measurements, Recurring | Level 1 | Residential mortgage and asset-backed securities
Assets:
Available-for-sale debt securities	0		0
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Assets:
Marketable equity securities	2,768		4,361
Fair Value, Measurements, Recurring | Level 1 | Equity investment in Galapagos
Assets:
Marketable equity securities	881		1,648
Fair Value, Measurements, Recurring | Level 1 | Other publicly traded equity securities
Assets:
Marketable equity securities	876		743
Fair Value, Measurements, Recurring | Level 1 | Deferred compensation plan
Assets:
Marketable equity securities	249		218
Liabilities:
Deferred compensation plan	249		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	2,184		1,729
Liabilities:
Total	8		121
Fair Value, Measurements, Recurring | Level 2 | MYR GmbH
Liabilities:
Liability for MYR GmbH (“MYR”) contingent consideration	0		0
Fair Value, Measurements, Recurring | Level 2 | U.S. treasury securities
Assets:
Available-for-sale debt securities	0		0
Fair Value, Measurements, Recurring | Level 2 | U.S. government agencies securities
Assets:
Available-for-sale debt securities	5		0
Fair Value, Measurements, Recurring | Level 2 | Non-U.S. government securities
Assets:
Available-for-sale debt securities	44		43
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit
Assets:
Available-for-sale debt securities	361		216
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities
Assets:
Available-for-sale debt securities	1,272		1,142
Fair Value, Measurements, Recurring | Level 2 | Residential mortgage and asset-backed securities
Assets:
Available-for-sale debt securities	447		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	55		12
Liabilities:
Foreign currency derivative contracts	8		121
Fair Value, Measurements, Recurring | Level 3
Assets:
Total	0		0
Liabilities:
Total	328		0
Fair Value, Measurements, Recurring | Level 3 | MYR GmbH
Liabilities:
Liability for MYR GmbH (“MYR”) contingent consideration	328	$ 341	0
Fair Value, Measurements, Recurring | Level 3 | U.S. treasury securities
Assets:
Available-for-sale debt securities	0		0
Fair Value, Measurements, Recurring | Level 3 | U.S. government agencies securities
Assets:
Available-for-sale debt securities	0		0
Fair Value, Measurements, Recurring | Level 3 | Non-U.S. government securities
Assets:
Available-for-sale debt securities	0		0
Fair Value, Measurements, Recurring | Level 3 | Certificates of deposit
Assets:
Available-for-sale debt securities	0		0
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities
Assets:
Available-for-sale debt securities	0		0
Fair Value, Measurements, Recurring | Level 3 | Residential mortgage and asset-backed securities
Assets:
Available-for-sale debt securities	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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