Post-Employment Benefits - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	May 08, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated benefit obligation	$ 10,500	$ 10,500
Defined benefit plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	12,006	11,792	$ 8,646
Actuarial (gain) loss	(8)	1,105
Amendments	$ 0	0
Defined benefit plans | Allergan plc
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligations recognized upon acquisition				$ 156
Defined benefit plans | Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target investment allocations for Pension Plan (as a percent)	62.50%
Defined benefit plans | Debt securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target investment allocations for Pension Plan (as a percent)	22.50%
Defined benefit plans | Asset allocation strategies and other holdings
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target investment allocations for Pension Plan (as a percent)	15.00%
Other post-employment plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	$ 850	795	1,050
Actuarial (gain) loss	$ 10	40
Amendments		(397)
Pre Sixty Five Years of Age
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual rate of increase in the per capita cost of covered health care obligation benefits assumed in the current year (as a percent)	5.90%
Ultimate per capita trend rate for health care costs from 2029 and thereafter (as a percent)	4.50%
Annual rate of increase in the per capita cost of covered health care cost benefits assumed in the current year (as a percent)	6.00%
Ultimate per capita trend rate for health care costs from 2029 and thereafter (as a percent)	4.50%
Post Sixty Five Years of Age
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual rate of increase in the per capita cost of covered health care obligation benefits assumed in the current year (as a percent)	2.10%
Ultimate per capita trend rate for health care costs from 2029 and thereafter (as a percent)	1.80%
Annual rate of increase in the per capita cost of covered health care cost benefits assumed in the current year (as a percent)	2.30%
Ultimate per capita trend rate for health care costs from 2029 and thereafter (as a percent)	2.00%
AbbVie Savings Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan expenses recorded	$ 267	191	$ 102
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	$ 3,200	$ 3,500