Leases - Cash Flow Disclosure (Details) - USD ($) $ in Millions		12 Months Ended
	May 08, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition
Operating cash flows from operating leases		$ 236	$ 185	$ 125
Right-of-use assets obtained in exchange for new operating lease liabilities		$ 66	$ 692	$ 26
Allergan plc
Business Acquisition
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 453