Revenue - Reconciliation of Gross Product Sales to Net Product Sales (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Gross to Net Adjustments [Line Items]
Total Revenues	$ 11,887	$ 11,703	$ 23,535	$ 22,776
Gross to Net Adjustments	(5,814)	(5,377)	(11,156)	(10,138)
Adjustments for provisions for product sales made in prior periods	123	85	197	302
Gross product sales
Gross to Net Adjustments [Line Items]
Total Revenues	17,299	16,782	33,949	32,341
Net product sales
Gross to Net Adjustments [Line Items]
Total Revenues	11,485	11,405	22,793	22,203
Charge-backs and cash discounts
Gross to Net Adjustments [Line Items]
Gross to Net Adjustments	(1,750)	(1,720)	(3,513)	(3,306)
Medicaid and Medicare rebates
Gross to Net Adjustments [Line Items]
Gross to Net Adjustments	(2,624)	(2,139)	(4,708)	(3,857)
Other rebates, returns, discounts and adjustments
Gross to Net Adjustments [Line Items]
Gross to Net Adjustments	$ (1,440)	$ (1,518)	$ (2,935)	$ (2,975)