v3.25.4
Post-Employment Benefits - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accumulated benefit obligation $ 8,700 $ 8,100  
Defined benefit plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Projected benefit obligation 9,658 8,964 $ 9,544
Actuarial (gain) loss $ 124 (855)  
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 $ 822 786 796
Actuarial (gain) loss $ (12) (62)  
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) 6.60%    
Ultimate per capita trend rate for health care costs from 2030 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) 6.60%    
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) 2.20%    
Ultimate per capita trend rate for health care costs from 2030 and thereafter (as a percent) 1.60%    
Annual rate of increase in the per capita cost of covered health care cost benefits assumed in the current year (as a percent) 2.00%    
Ultimate per capita trend rate for health care costs from 2029 and thereafter (as a percent) 1.80%    
AbbVie Savings Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan expenses recorded $ 504 425 $ 398
Foreign Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Projected benefit obligation $ 2,300 $ 2,200