Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Employee benefit plan contribution from Pfizer Inc.	$ 0
Pension and other postretirement benefit expense	6	$ 12	$ 14
Actuarial losses	4	6
Actuarial losses, net of tax	4	3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	5	6	8
Interest cost	5	2	2
Expected return on plan assets	(4)	(3)	(3)
Amortization of net losses	0	1	1
Net periodic benefit cost	6	6	8
Company contributions	6	4
Contribution expense	$ (69)	(57)	(54)
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]
2020	$ 5
Contribution expense	(11)	(9)	(12)
Defined Benefit Plan, Expected Future Benefit Payment, Thereafter	46
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	$ 0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Postretirement benefit expense	0	$ 0	$ 0
United States | Pfizer
Defined Benefit Plan Disclosure [Line Items]
Remaining total cost	$ 25
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Period of amortization	10 years 1 month 6 days
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Expected contribution in 2020	$ 7
2020	7
2021	6
2022	11
2023	7
2024	7
Thereafter	$ 53