Contingent Consideration (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]
Business Combination, Contingent Consideration, Liability Beginning Balance	$ 486
Fair value of contingent consideration recorded in purchase accounting	0	$ 219
Contingent consideration net expense (benefit)	12	$ (6)
Payment of contingent consideration	(41)
Business Combination, Contingent Consideration, Liability Ending Balance	456
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Business Combination, Contingent Consideration, Liability	456
All Business Acquisitions
Business Combination, Contingent Consideration Arrangements [Abstract]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	964
Valuation Technique, Discounted Cash Flow [Member] | R&D, Regulatory and Commercialization-based Milestone [Member]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]
Business Combination, Contingent Consideration, Liability Ending Balance	147
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Business Combination, Contingent Consideration, Liability	147
Valuation Technique, Discounted Cash Flow [Member] | revenue-based payments [Member]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]
Business Combination, Contingent Consideration, Liability Ending Balance	308
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Business Combination, Contingent Consideration, Liability	$ 308
contingent consideration liability, probability of payment	100.00%
Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] | R&D, Regulatory and Commercialization-based Milestone [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
contingent consideration liability, probability of payment	80.00%
Discount Rate, Fair Value Input	1.00%
Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] | revenue-based payments [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Discount Rate, Fair Value Input	4.00%
Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] | R&D, Regulatory and Commercialization-based Milestone [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
contingent consideration liability, probability of payment	100.00%
Discount Rate, Fair Value Input	2.00%
Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] | revenue-based payments [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Discount Rate, Fair Value Input	14.00%
Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] | R&D, Regulatory and Commercialization-based Milestone [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
contingent consideration liability, probability of payment	92.00%
Discount Rate, Fair Value Input	1.00%
Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] | revenue-based payments [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
contingent consideration liability, probability of payment	100.00%
Discount Rate, Fair Value Input	6.00%