Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Employee benefit plan contribution from Pfizer Inc.	$ 8	$ 10
Pension and other postretirement benefit expense	13	14	$ 15
Actuarial losses	32	21
Actuarial losses, net of tax	22	13
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	6	7	7
Interest cost	3	3	3
Expected return on plan assets	(3)	(3)	(3)
Amortization of net (gains) / losses	1	1	1
Settlement and curtailments (gains) / losses	0	(1)	1
Net periodic benefit cost	7	7	9
Company contributions	5	5
Contribution expense	$ 46	43	38
Matching percentage	100.00%
Maximum matching percentage	5.00%
Additional contribution percentage, minimum	0.00%
Additional contribution percentage, maximum	8.00%
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	$ 1
Other Pension Plan, Postretirement or Supplemental Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Contribution expense	12	2
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 10 months 24 days
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Expected contribution in 2020	$ 6
2020	3
2021	3
2022	5
2023	4
2024	5
Thereafter	$ 39