Other Financial Information - Inventories - Footnotes (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Inventory [Line Items]
Increase in inventories	[1]	$ 1,169	$ 591	$ 1,125
Write-offs	[1]	6,199	$ 1,183	$ 0
Decrease in other noncurrent assets		1,300
Seagen [Member]
Inventory [Line Items]
Increase in inventories		1,000
Increase in noncurrent inventories		3,100
Paxlovid and Comirnaty [Member]
Inventory [Line Items]
Write-offs		1,000
Paxlovid, EUA-Labeled [Member]
Inventory [Line Items]
Write-offs		4,200
Comirnaty [Member]
Inventory [Line Items]
Write-offs		$ 700

[1] See Notes 8A and 17A.