Post-Employment Benefits - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated benefit obligation	$ 7,600	$ 6,000
Accumulated benefit obligations in excess of plan assets - ABO	5,800
Accumulated benefit obligations in excess of plan assets - PBO	6,700
Accumulated benefit obligations in excess of plan assets - Aggregate plan assets	$ 4,800
Ultimate per capita trend rate for health care costs from 2064 and thereafter	4.50%
Ultimate per capita trend rate for health care costs from 2064 and thereafter (as a percent)	4.50%
Defined benefit plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	$ 8,646	6,618	$ 6,985
Pre-tax amount of actuarial loss and prior service cost included in AOCI that is expected to be recognized in net periodic benefit cost	$ 219
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)	35.00%
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)	20.00%
Defined benefit plans | Defined Benefit Plan Other Assets
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target investment allocations for Pension Plan (as a percent)	45.00%
Other post-employment plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	$ 1,050	561	813
Pre-tax amount of actuarial loss and prior service cost included in AOCI that is expected to be recognized in net periodic benefit cost	$ 25
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)	6.40%
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%
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)	7.00%
Annual rate of increase in the per capita cost of covered health care cost benefits assumed in the current year (as a percent)	7.30%
AbbVie Savings Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expenses recorded	$ 102	89	$ 82
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	$ 2,300	$ 1,900