Post-Employment Benefits (Details) - AbbVie sponsored plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined benefit plans
Defined benefit and other post-employment plans
Service cost	$ 72	$ 59	$ 144	$ 117
Interest cost	57	51	114	101
Expected return on plan assets	(110)	(95)	(221)	(190)
Amortization of actuarial losses and prior service costs	39	27	76	53
Net periodic benefit cost	58	42	113	81
Other post-employment plans
Defined benefit and other post-employment plans
Service cost	5	6	13	13
Interest cost	4	6	12	12
Expected return on plan assets	0	0	0	0
Amortization of actuarial losses and prior service costs	(3)	(1)	1	0
Net periodic benefit cost	$ 6	$ 11	$ 26	$ 25