Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Compensation and employee benefits		$ 937	$ 1,109
Accruals and reserves		667	438
Chargebacks and rebates		837	555
Advance payments		809	324
Net operating losses and other credit carryforwards		10,095	2,765
Other		1,234	1,371
Total deferred tax assets		14,579	6,562
Valuation allowances		(9,391)	(1,203)
Total net deferred tax assets		5,188	5,359
Deferred tax liabilities
Excess of book basis over tax basis of intangible assets		(4,711)	(5,274)
Excess of book basis over tax basis in investments		(308)	(335)
Other		(904)	(982)
Total deferred tax liabilities		(5,923)	(6,591)
Net deferred tax liabilities		(735)	(1,232)
Tax Credit Carryforward
Valuation allowances		(9,391)	$ (1,203)
Allergan plc
Tax Credit Carryforward
Measurement period adjustments to deferred income tax assets	$ 8,200
Measurement period adjustment to deferred tax assets valuation allowance	$ 8,200
U.S. Federal and State
Tax Credit Carryforward
Tax credit carryforwards		214
U.S. Federal, State and Non-U.S.
Tax Credit Carryforward
Operating loss carryforwards with expiration through 2041		34,400
U.S. Federal and Non-U.S.
Tax Credit Carryforward
Operating loss carryforwards		$ 3,200