Debt Instrument, Average Maturity

No definition available.

Name:	ogn_DebtInstrumentAverageMaturity
Namespace Prefix:	ogn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Interest Payments

+ References

No definition available.

+ Details

Name:	ogn_DebtInstrumentInterestPayments
Namespace Prefix:	ogn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Debt Instruments, Covenants, Payment Terms, Principal Amount Outstanding, Percent

+ References

No definition available.

+ Details

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Namespace Prefix:	ogn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Lessee, Operating Lease, Lease Not yet Commenced, Amount

+ References

No definition available.

+ Details

Name:	ogn_LesseeOperatingLeaseLeaseNotYetCommencedAmount
Namespace Prefix:	ogn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Lessee, Operating Lease, Number Of Contracts With Options To Extend

+ References

No definition available.

+ Details

Name:	ogn_LesseeOperatingLeaseNumberOfContractsWithOptionsToExtend
Namespace Prefix:	ogn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Step Down, Unused Capacity Commitment Fee Percentage

+ References

No definition available.

+ Details

Name:	ogn_LineOfCreditFacilityStepDownUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	ogn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

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Balance Type:	debit
Period Type:	instant

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

Amount of lease cost recognized by lessee for lease contract.

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Balance Type:	debit
Period Type:	duration

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
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Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Weighted average interest rate of long-term debt outstanding calculated over time.

+ References

No definition available.

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- Definition

Amount of cash outflow from operating lease to bring another asset to condition and location necessary for its intended use.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

The distributions of earnings to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Name:	us-gaap_VariableRateAxis=ogn_AdjustedLondonInterbankOfferedRateLIBORMember
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Long-Term Debt and Leases - Narrative (Details)		1 Months Ended	3 Months Ended		9 Months Ended
Long-Term Debt and Leases - Narrative (Details)	Jun. 02, 2021 USD ($)	Apr. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) lease	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) lease	Sep. 30, 2020 USD ($)	Sep. 30, 2021 EUR (€) lease	Jun. 30, 2021 USD ($)	Jun. 02, 2021 EUR (€)	Apr. 30, 2021 EUR (€)	Dec. 31, 2020
Debt Instrument [Line Items]
Net transfers from (to) Merck & Co., Inc.		$ 9,000,000,000
Other (discounts and debt issuance costs)			$ 130,000,000		$ 130,000,000
Fair value of long-term debt			9,600,000,000		9,600,000,000
Long-term debt			9,298,000,000		9,298,000,000
Repayments of long-term debt					$ 10,000,000	$ 0
Debt instrument interest payments			$ 34,000,000
Average maturity of long-term debt					7 years 3 months 18 days
Weighted average interest rate of debt			3.90%
Weighted-average remaining lease term (years)			5 years 3 months 18 days		5 years 3 months 18 days		5 years 3 months 18 days				4 years
Operating lease cost			$ 19,000,000	$ 10,000,000	$ 56,000,000	$ 32,000,000
Operating lease payments					27,000,000
Operating lease assets obtained in exchange for operating lease liability					288,000,000
Amount of operating lease not yet commenced			$ 7,000,000		$ 7,000,000
Real Estate
Debt Instrument [Line Items]
Weighted-average remaining lease term (years)			6 years 1 month 6 days		6 years 1 month 6 days		6 years 1 month 6 days
Number of leases with options to renew \| lease			2		2		2
Operating Lease One \| Real Estate
Debt Instrument [Line Items]
Operating lease renewal term			5 years		5 years		5 years
Operating Lease Two \| Real Estate
Debt Instrument [Line Items]
Operating lease renewal term			1 year		1 year		1 year
Senior Notes
Debt Instrument [Line Items]
Debt issuance costs								$ 118,000,000
Senior Notes \| Organon Finance 1 LLC
Debt Instrument [Line Items]
Face amount of debt \| €										€ 1,250,000,000
Senior Notes \| Term Loan B Facility
Debt Instrument [Line Items]
Face amount of debt	$ 3,000,000,000
Debt term	7 years
Interest payment terms	0.25%
Senior Notes \| Term Loan B Facility \| Adjusted LIBOR
Debt Instrument [Line Items]
Spread on variable rate	3.00%
Senior Notes \| Term Loan B Facility \| Adjusted LIBOR \| Minimum
Debt Instrument [Line Items]
Spread on variable rate	0.50%
Senior Notes \| Term Loan B Facility \| Alternate Base Rate
Debt Instrument [Line Items]
Spread on variable rate	2.00%
Senior Notes \| Term Loan B Facility \| Adjusted EURIBOR
Debt Instrument [Line Items]
Spread on variable rate	3.00%
Senior Notes \| Term Loan B Facility \| Adjusted EURIBOR \| Minimum
Debt Instrument [Line Items]
Spread on variable rate	0.00%
Senior Notes \| 2.875% Senior Secured Notes Due 2028 \| Organon Finance 1 LLC
Debt Instrument [Line Items]
Face amount of debt \| €							€ 1,250,000,000
Stated interest rate		2.875%	2.875%		2.875%		2.875%			2.875%
Senior Notes \| 4.125% Senior Secured Notes Due 2028 \| Organon Finance 1 LLC
Debt Instrument [Line Items]
Face amount of debt		$ 2,100,000,000
Stated interest rate		4.125%	4.125%		4.125%		4.125%			4.125%
Senior Notes \| 5.125% Senior Unsecured Notes Due 2031 \| Organon Finance 1 LLC
Debt Instrument [Line Items]
Face amount of debt		$ 2,000,000,000
Stated interest rate		5.125%	5.125%		5.125%		5.125%			5.125%
Senior Notes \| Euro Denominated Term Loan B
Debt Instrument [Line Items]
Face amount of debt \| €							€ 750,000,000		€ 750,000,000
Debt term	7 years
Term Loans
Debt Instrument [Line Items]
Debt issuance costs			$ 19,000,000		$ 19,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Debt term	5 years
Borrowing capacity	$ 1,000,000,000
Unused capacity commitment fee percentage	0.50%
Step down on unused capacity commitment fee	0.375%
Line of credit			$ 0		$ 0
Revolving Credit Facility \| Adjusted LIBOR
Debt Instrument [Line Items]
Spread on variable rate	2.00%
Revolving Credit Facility \| Adjusted LIBOR \| Minimum
Debt Instrument [Line Items]
Spread on variable rate	0.00%
Revolving Credit Facility \| Alternate Base Rate
Debt Instrument [Line Items]
Spread on variable rate	1.00%
Revolving Credit Facility \| Adjusted EURIBOR
Debt Instrument [Line Items]
Spread on variable rate	2.00%