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Fair Value Measurements - Summary of Assets and Liabilities Recorded at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2021	Mar. 04, 2021	Dec. 31, 2020
Assets
Available-for-sale debt securities	$ 2,497		$ 2,026
Other publicly traded equity securities
Assets
Total	5,743		6,970
Fair value, recurring | Fair value
Assets
Total	8,320		9,008
Liabilities:
Total	583		339
Fair value, recurring | Fair value | MYR
Liabilities:
Liability for MYR GmbH (“MYR”) contingent consideration	317		0
Fair value, recurring | Fair value | U.S. treasury securities
Assets
Available-for-sale debt securities	407		309
Fair value, recurring | Fair value | U.S. government agencies securities
Assets
Available-for-sale debt securities	4		0
Fair value, recurring | Fair value | Non-U.S. government securities
Assets
Available-for-sale debt securities	50		43
Fair value, recurring | Fair value | Certificates of deposit
Assets
Available-for-sale debt securities	249		216
Fair value, recurring | Fair value | Corporate debt securities
Assets
Available-for-sale debt securities	1,363		1,142
Fair value, recurring | Fair value | Residential mortgage and asset-backed securities
Assets
Available-for-sale debt securities	424		316
Fair value, recurring | Fair value | Money market funds
Assets
Marketable equity securities	3,661		4,361
Fair value, recurring | Fair value | Other publicly traded equity securities
Assets
Marketable equity securities	331		531
Fair value, recurring | Fair value | Other publicly traded equity securities | Galapagos
Assets
Marketable equity securities	931		1,648
Fair value, recurring | Fair value | Other publicly traded equity securities | Arcus
Assets
Marketable equity securities	559		212
Fair value, recurring | Fair value | Deferred compensation plan
Assets
Marketable equity securities	261		218
Liabilities:
Deferred compensation plan	261		218
Fair value, recurring | Fair value | Foreign currency derivative contracts
Assets
Foreign currency derivative contracts	80		12
Liabilities:
Foreign currency derivative contracts	5		121
Fair value, recurring | Level 1
Assets
Total	6,150		7,279
Liabilities:
Total	261		218
Fair value, recurring | Level 1 | MYR
Liabilities:
Liability for MYR GmbH (“MYR”) contingent consideration	0		0
Fair value, recurring | Level 1 | U.S. treasury securities
Assets
Available-for-sale debt securities	407		309
Fair value, recurring | Level 1 | U.S. government agencies securities
Assets
Available-for-sale debt securities	0		0
Fair value, recurring | Level 1 | Non-U.S. government securities
Assets
Available-for-sale debt securities	0		0
Fair value, recurring | Level 1 | Certificates of deposit
Assets
Available-for-sale debt securities	0		0
Fair value, recurring | Level 1 | Corporate debt securities
Assets
Available-for-sale debt securities	0		0
Fair value, recurring | Level 1 | Residential mortgage and asset-backed securities
Assets
Available-for-sale debt securities	0		0
Fair value, recurring | Level 1 | Money market funds
Assets
Marketable equity securities	3,661		4,361
Fair value, recurring | Level 1 | Other publicly traded equity securities
Assets
Marketable equity securities	331		531
Fair value, recurring | Level 1 | Other publicly traded equity securities | Galapagos
Assets
Marketable equity securities	931		1,648
Fair value, recurring | Level 1 | Other publicly traded equity securities | Arcus
Assets
Marketable equity securities	559		212
Fair value, recurring | Level 1 | Deferred compensation plan
Assets
Marketable equity securities	261		218
Liabilities:
Deferred compensation plan	261		218
Fair value, recurring | Level 1 | Foreign currency derivative contracts
Assets
Foreign currency derivative contracts	0		0
Liabilities:
Foreign currency derivative contracts	0		0
Fair value, recurring | Level 2
Assets
Total	2,170		1,729
Liabilities:
Total	5		121
Fair value, recurring | Level 2 | MYR
Liabilities:
Liability for MYR GmbH (“MYR”) contingent consideration	0		0
Fair value, recurring | Level 2 | U.S. treasury securities
Assets
Available-for-sale debt securities	0		0
Fair value, recurring | Level 2 | U.S. government agencies securities
Assets
Available-for-sale debt securities	4		0
Fair value, recurring | Level 2 | Non-U.S. government securities
Assets
Available-for-sale debt securities	50		43
Fair value, recurring | Level 2 | Certificates of deposit
Assets
Available-for-sale debt securities	249		216
Fair value, recurring | Level 2 | Corporate debt securities
Assets
Available-for-sale debt securities	1,363		1,142
Fair value, recurring | Level 2 | Residential mortgage and asset-backed securities
Assets
Available-for-sale debt securities	424		316
Fair value, recurring | Level 2 | Money market funds
Assets
Marketable equity securities	0		0
Fair value, recurring | Level 2 | Other publicly traded equity securities
Assets
Marketable equity securities	0		0
Fair value, recurring | Level 2 | Other publicly traded equity securities | Galapagos
Assets
Marketable equity securities	0		0
Fair value, recurring | Level 2 | Other publicly traded equity securities | Arcus
Assets
Marketable equity securities	0		0
Fair value, recurring | Level 2 | Deferred compensation plan
Assets
Marketable equity securities	0		0
Liabilities:
Deferred compensation plan	0		0
Fair value, recurring | Level 2 | Foreign currency derivative contracts
Assets
Foreign currency derivative contracts	80		12
Liabilities:
Foreign currency derivative contracts	5		121
Fair value, recurring | Level 3
Assets
Total	0		0
Liabilities:
Total	317		0
Fair value, recurring | Level 3 | MYR
Liabilities:
Liability for MYR GmbH (“MYR”) contingent consideration	317	$ 341	0
Fair value, recurring | Level 3 | U.S. treasury securities
Assets
Available-for-sale debt securities	0		0
Fair value, recurring | Level 3 | U.S. government agencies securities
Assets
Available-for-sale debt securities	0		0
Fair value, recurring | Level 3 | Non-U.S. government securities
Assets
Available-for-sale debt securities	0		0
Fair value, recurring | Level 3 | Certificates of deposit
Assets
Available-for-sale debt securities	0		0
Fair value, recurring | Level 3 | Corporate debt securities
Assets
Available-for-sale debt securities	0		0
Fair value, recurring | Level 3 | Residential mortgage and asset-backed securities
Assets
Available-for-sale debt securities	0		0
Fair value, recurring | Level 3 | Money market funds
Assets
Marketable equity securities	0		0
Fair value, recurring | Level 3 | Other publicly traded equity securities
Assets
Marketable equity securities	0		0
Fair value, recurring | Level 3 | Other publicly traded equity securities | Galapagos
Assets
Marketable equity securities	0		0
Fair value, recurring | Level 3 | Other publicly traded equity securities | Arcus
Assets
Marketable equity securities	0		0
Fair value, recurring | Level 3 | Deferred compensation plan
Assets
Marketable equity securities	0		0
Liabilities:
Deferred compensation plan	0		0
Fair value, 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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