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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investment Valuation (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
AbbVie Savings Plan    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value $ 15,718,310 $ 13,183,237
AbbVie Savings Plan | Interest bearing cash    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 25 93
AbbVie Savings Plan | Common stock    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 3,047,016 2,583,223
AbbVie Savings Plan | Mutual funds    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 5,288 3,255
AbbVie Savings Plan | Collective trust funds    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 12,461,950 10,447,456
AbbVie Savings Plan | Self-directed brokerage accounts    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 204,031 149,210
AbbVie Savings Plan | Level 1    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 15,718,310 13,183,237
AbbVie Savings Plan | Level 1 | Interest bearing cash    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 25 93
AbbVie Savings Plan | Level 1 | Common stock    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 3,047,016 2,583,223
AbbVie Savings Plan | Level 1 | Mutual funds    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 5,288 3,255
AbbVie Savings Plan | Level 1 | Collective trust funds    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 12,461,950 10,447,456
AbbVie Savings Plan | Level 1 | Self-directed brokerage accounts    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 204,031 149,210
AbbVie Puerto Rico Savings Plan    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 665,280 552,504
AbbVie Puerto Rico Savings Plan | Common stock    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 329,280 276,713
AbbVie Puerto Rico Savings Plan | Mutual funds    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 8,595 41,065
AbbVie Puerto Rico Savings Plan | Collective trust funds    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 325,555 233,155
AbbVie Puerto Rico Savings Plan | Self-directed brokerage accounts    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 1,850 1,571
AbbVie Puerto Rico Savings Plan | Level 1    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 665,280 552,504
AbbVie Puerto Rico Savings Plan | Level 1 | Common stock    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 329,280 276,713
AbbVie Puerto Rico Savings Plan | Level 1 | Mutual funds    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 8,595 41,065
AbbVie Puerto Rico Savings Plan | Level 1 | Collective trust funds    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value 325,555 233,155
AbbVie Puerto Rico Savings Plan | Level 1 | Self-directed brokerage accounts    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Assets at fair value $ 1,850 $ 1,571