Summary of Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Customer discounts	$ 12,300	$ 12,300	$ 11,400
Accrual for chargebacks reflected as direct reduction to accounts receivable	178	207
Accrual for rebates included in accrued and other current liabilities	$ 2,700	2,600
Product return period and expiration	12 months
Depreciation	$ 1,824	1,578	1,669
Advertising and promotion costs	$ 2,200	$ 2,000	$ 1,800
Minimum
Summary Of Significant Accounting Policies [Line Items]
Product return period	3 months
Estimated useful life of intangible assets	2 years
Minimum | Capitalized Software
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets	3 years
Minimum | Buildings
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment	25 years
Minimum | Machinery, equipment and office furnishings
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment	3 years
Minimum | United States | Pharmaceutical segment
Summary Of Significant Accounting Policies [Line Items]
Payment terms	36 days
Minimum | United States | Animal Health
Summary Of Significant Accounting Policies [Line Items]
Payment terms	30 days
Minimum | Outside of the United States
Summary Of Significant Accounting Policies [Line Items]
Payment terms	30 days
Maximum
Summary Of Significant Accounting Policies [Line Items]
Product return period	6 months
Estimated useful life of intangible assets	24 years
Maximum | Capitalized Software
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets	10 years
Maximum | Buildings
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment	40 years
Maximum | Machinery, equipment and office furnishings
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment	15 years
Maximum | United States
Summary Of Significant Accounting Policies [Line Items]
Payment terms	90 days
Maximum | Outside of the United States
Summary Of Significant Accounting Policies [Line Items]
Payment terms	90 days