Revenue - Reconciliation of Gross Product Sales to Net Product Sales (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Gross to Net Adjustments [Line Items]
Total Revenues	$ 11,648	$ 11,073
Gross to Net Adjustments	(5,342)	(4,761)
Adjustments for provisions for product sales made in prior periods	74	217
Gross product sales
Gross to Net Adjustments [Line Items]
Total Revenues	16,650	15,559
Net product sales
Gross to Net Adjustments [Line Items]
Total Revenues	11,308	10,798
Charge-backs and cash discounts
Gross to Net Adjustments [Line Items]
Gross to Net Adjustments	(1,763)	(1,586)
Medicaid and Medicare rebates
Gross to Net Adjustments [Line Items]
Gross to Net Adjustments	(2,084)	(1,718)
Other rebates, returns, discounts and adjustments
Gross to Net Adjustments [Line Items]
Gross to Net Adjustments	$ (1,495)	$ (1,457)