Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Employee benefit plan contribution from Pfizer Inc.	$ 5	$ 8
Pension and other postretirement benefit expense	14	13	$ 14
Actuarial losses	32	32
Actuarial losses, net of tax	22	22
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	8	6	7
Interest cost	2	3	3
Expected return on plan assets	(3)	(3)	(3)
Amortization of net (gains) / losses	2	1	1
Settlement and curtailments (gains) / losses	0	0	(1)
Net periodic benefit cost	9	7	7
Company contributions	5	5
Contribution expense	$ 48	46	43
Matching percentage	100.00%
Maximum matching percentage	5.00%
Additional contribution percentage, minimum	0.00%
Additional contribution percentage, maximum	8.00%
Other Pension Plan, Postretirement or Supplemental Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Contribution expense	$ 11	12
United States
Defined Benefit Plan Disclosure [Line Items]
Total cost of service credit continuation	$ 38
Installment period	10 years
Pension and other postretirement benefit expense	$ 6	6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
2020	4
2021	4
2022	4
Postretirement benefit expense	4	$ 4	$ 4
United States | Pfizer
Defined Benefit Plan Disclosure [Line Items]
Remaining total cost	$ 25
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Period of amortization	11 years 1 month 6 days
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Expected contribution in 2020	$ 7
2020	3
2021	6
2022	4
2023	6
2024	6
Thereafter	$ 52