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FAIR VALUE MEASUREMENTS - Summary of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets:
Available-for-sale debt securities	$ 2,514	$ 2,497
MYR GmbH
Liabilities:
Liability for MYR GmbH (“MYR”) contingent consideration	322
Other publicly traded equity securities
Assets:
Total	4,337	5,743
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement
Assets:
Total	6,935	8,320
Liabilities:
Total	586	583
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | MYR GmbH
Liabilities:
Liability for MYR GmbH (“MYR”) contingent consideration	322	317
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | U.S. treasury securities
Assets:
Available-for-sale debt securities	476	407
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | U.S. government agencies securities
Assets:
Available-for-sale debt securities	5	4
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Non-U.S. government securities
Assets:
Available-for-sale debt securities	30	50
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Certificates of deposit
Assets:
Available-for-sale debt securities	153	249
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Corporate debt securities
Assets:
Available-for-sale debt securities	1,442	1,363
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Residential mortgage and asset-backed securities
Assets:
Available-for-sale debt securities	407	424
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Money market funds
Assets:
Marketable equity securities	2,360	3,661
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Other publicly traded equity securities
Assets:
Marketable equity securities	243	331
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Other publicly traded equity securities | Galapagos
Assets:
Marketable equity securities	1,046	931
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Other publicly traded equity securities | Arcus
Assets:
Marketable equity securities	436	559
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Deferred compensation plan
Assets:
Marketable equity securities	253	261
Liabilities:
Deferred compensation plan	253	261
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Foreign currency derivative contracts
Assets:
Foreign currency derivative contracts	84	80
Liabilities:
Foreign currency derivative contracts	11	5
Fair Value, Measurements, Recurring | Level 1
Assets:
Total	4,813	6,150
Liabilities:
Total	253	261
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	476	407
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	2,360	3,661
Fair Value, Measurements, Recurring | Level 1 | Other publicly traded equity securities
Assets:
Marketable equity securities	243	331
Fair Value, Measurements, Recurring | Level 1 | Other publicly traded equity securities | Galapagos
Assets:
Marketable equity securities	1,046	931
Fair Value, Measurements, Recurring | Level 1 | Other publicly traded equity securities | Arcus
Assets:
Marketable equity securities	436	559
Fair Value, Measurements, Recurring | Level 1 | Deferred compensation plan
Assets:
Marketable equity securities	253	261
Liabilities:
Deferred compensation plan	253	261
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	2,122	2,170
Liabilities:
Total	11	5
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	4
Fair Value, Measurements, Recurring | Level 2 | Non-U.S. government securities
Assets:
Available-for-sale debt securities	30	50
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit
Assets:
Available-for-sale debt securities	153	249
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities
Assets:
Available-for-sale debt securities	1,442	1,363
Fair Value, Measurements, Recurring | Level 2 | Residential mortgage and asset-backed securities
Assets:
Available-for-sale debt securities	407	424
Fair Value, Measurements, Recurring | Level 2 | Money market funds
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 | Other publicly traded equity securities | Galapagos
Assets:
Marketable equity securities	0	0
Fair Value, Measurements, Recurring | Level 2 | Other publicly traded equity securities | Arcus
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	84	80
Liabilities:
Foreign currency derivative contracts	11	5
Fair Value, Measurements, Recurring | Level 3
Assets:
Total	0	0
Liabilities:
Total	322	317
Fair Value, Measurements, Recurring | Level 3 | MYR GmbH
Liabilities:
Liability for MYR GmbH (“MYR”) contingent consideration	322	317
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 | Other publicly traded equity securities
Assets:
Marketable equity securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Other publicly traded equity securities | Galapagos
Assets:
Marketable equity securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Other publicly traded equity securities | Arcus
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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