Third Party Arrangements Related Party Disclosures - Balances with Merck Affiliates (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Due to related party	$ 0	$ 1,339
Related Party \| Continuing Operations \| Merck and Co., Inc.
Related Party Transaction [Line Items]
Short term borrowings, net		1,512
Short term loans and notes payable, net		0
Trade payables (receivables), net		(173)
Due to related party		1,339
Related Party \| Discontinued Operations \| Merck and Co., Inc.
Related Party Transaction [Line Items]
Short term loans and notes payable, net		(25)
Short term loans receivables, net		247
Trade payables, net		(33)
Due from related party		$ 189

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