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Financial Instruments and Fair Value Measures - Debt and Credit Facilities (Details) € in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) | Jun. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2024 EUR (€) | Mar. 31, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Feb. 12, 2024 USD ($) | Dec. 21, 2023 USD ($) | Dec. 06, 2023 USD ($)
Short-Term Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings | $ 3,790 |  |  |  |  |  | $ 3,790 |  | $ 0 |  |  |
Proceeds from issuance of other short-term borrowings |  |  |  |  |  |  | 4,798 | $ 5,008 |  |  |  |
Repayments of other short-term borrowings |  |  |  |  |  |  | 2,007 | $ 5,008 |  |  |  |
Commercial paper |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings | 1,800 |  |  |  |  |  | $ 1,800 |  |  |  |  |
Short-Term Debt, Weighted Average Interest Rate, over Time |  |  |  |  |  |  | 4.59% | 5.54% |  |  |  |
December 2023 Bridge Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  | $ 9,000
364-day Term Loan Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 4,000 |  |  |  |  |  | $ 4,000 |  |  |  | $ 5,000 |
Short-term borrowings |  | $ 2,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.70% |  |  |  |  |  |  |  |  |  |
Commercial Paper With Original Maturities Greater Than Three Months |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings | $ 791 |  |  |  |  |  | $ 791 |  |  |  |  |
Term loan facilities |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Weighted Average Interest Rate, over Time |  |  |  |  |  | 6.29% |  |  |  |  |  |
Senior Notes Issued in 2024 |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  |  |  | $ 99 |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  |  | 37 |  |  |  |  |  |
Senior Notes Issued in 2024 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  |  |  | 15,000 |  |  |  |  |  |
December 2023 Term Loan Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Other Short-Term Debt |  |  |  |  |  | 5,000 |  |  |  |  |  |
Repayments of other short-term borrowings |  |  |  |  |  | $ 5,000 |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 0.975% |  |  |  |  |  |
3.80% Senior Notes | Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  | 3.80% |  |  |  |  |  |  |  |  |
3.80% Senior Notes | Term loan facilities |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  | $ (3,000) |  |  |  |  |  |  |  |  |
4.65% Senior Notes due 2028 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 4.65% |  |  |  |  |  | 4.65% |  |  |  |  |
Aggregate principal amount of debt | $ 1,250 |  |  |  |  |  | $ 1,250 |  |  |  |  |
4.875% Senior Notes due 2030 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 4.875% |  |  |  |  |  | 4.875% |  |  |  |  |
Aggregate principal amount of debt | $ 1,000 |  |  |  |  |  | $ 1,000 |  |  |  |  |
5.20% Senior Notes due 2035 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 5.20% |  |  |  |  |  | 5.20% |  |  |  |  |
Aggregate principal amount of debt | $ 1,000 |  |  |  |  |  | $ 1,000 |  |  |  |  |
5.60% Senior Notes due 2055 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 5.60% |  |  |  |  |  | 5.60% |  |  |  |  |
Aggregate principal amount of debt | $ 750 |  |  |  |  |  | $ 750 |  |  |  |  |
Senior Notes Issued in 2025 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt | 4,000 |  |  |  |  |  | 4,000 |  |  |  |  |
ImmunoGen Senior Secured Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other Long-Term Debt |  |  |  |  |  |  |  |  |  | $ (99) |  |
3.60% Senior Notes | Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 3.60% |  |  |  |  |  |  |  |  |  |
3.60% Senior Notes | Term loan facilities |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  | $ (3,800) |  |  |  |  |  |  |  |  |  |
1.38% Senior Notes | Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 1.38% | 1.38% |  |  |  |  |  |  |
1.38% Senior Notes | Term loan facilities |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt | € |  |  |  |  | € (1,500) |  |  |  |  |  |  |
1.25% Senior Euro Notes due 2024 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 1.25% | 1.25% |  |  |  |  |  |  |
1.25% Senior Euro Notes due 2024 | Term loan facilities |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt | € |  |  |  |  | € (700) |  |  |  |  |  |  |
3.85% Senior Euro Notes due 2024 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 3.85% | 3.85% |  |  |  |  |  |  |
3.85% Senior Euro Notes due 2024 | Term loan facilities |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  | $ (1,000) |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Line of Credit | $ 0 |  |  |  |  |  | 0 |  | $ 0 |  |  |
Revolving Credit Facility Maturing 2028 |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Expiration Period | 5 years |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 5,000 |  |  |  |  |  | 5,000 |  |  |  |  |
Revolving Credit Facility Maturing 2030 |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Expiration Period | 5 years |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 3,000 |  |  |  |  |  | $ 3,000 |  |  |  |  |

X
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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Period remaining on line of credit facility before it terminates, 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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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Weighted average interest rate of long-term debt outstanding calculated over time. + References No definition available. + Details
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- Definition Amount of long-term debt classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Amount of cash inflow from short-term debt classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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- Definition Amount of cash inflow (outflow) from long-term debt, finance lease obligation, and mandatorily redeemable capital security. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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- Definition The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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- Definition Amount of cash outflow for the payment of debt classified as other, maturing within one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481372/852-10-55-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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