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Financing arrangements (Narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
renewal_option
Dec. 31, 2022
USD ($)
Mar. 31, 2023
CHF (SFr)
Debt Instrument [Line Items]      
Face amount $ 24,000,000,000    
Extinguishment of debt 420,000,000    
Gain (loss) on extinguishment of debt $ 113,000,000    
Line of Credit Facility, Commitment Fee Percentage 0.09%    
Horizon Therapeutics      
Debt Instrument [Line Items]      
Bridge credit, reduced amount   $ 24,500,000,000  
term loan credit agreement, total amount $ 4,000,000,000 4,000,000,000  
Horizon Therapeutics | Other Nonoperating Income (Expense)      
Debt Instrument [Line Items]      
Amortization of Other Deferred Charges 98,000,000    
0.41% CHF700 million bonds due 2023 (0.41% 2023 Swiss franc Bonds) | Cross-currency swap contracts | Cash flow hedge      
Debt Instrument [Line Items]      
Notional amounts $ 704,000,000    
Notes | 4.563% notes due 2048 (4.563% 2048 Notes) [Member]      
Debt Instrument [Line Items]      
Effective interest rate 6.30%   6.30%
Interest rate, stated percentage 4.563%   4.563%
Notes | 4.663% notes due 2051 (4.663% 2051 Notes) [Member]      
Debt Instrument [Line Items]      
Effective interest rate 5.60%   5.60%
Interest rate, stated percentage 4.663%   4.663%
Notes | 2.77% notes due 2053 (2.77% 2053 Notes) {Member]      
Debt Instrument [Line Items]      
Effective interest rate 5.20%   5.20%
Interest rate, stated percentage 2.77%   2.77%
Notes | 3.00% 2029 Notes [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 3.00%   3.00%
Notes | 3.35% 2032 Notes [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 3.35%   3.35%
Notes | 4.20% 2052 Notes [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 4.20%   4.20%
Notes | 4.40% 2062 Notes [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 4.40%   4.40%
Notes | 4.05% 2029 Notes [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 4.05%   4.05%
Notes | 4.20% 2033 Notes [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 4.20%   4.20%
Notes | 4.875% 2053 Notes [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 4.875%   4.875%
Notes | 2.20% notes due 2027 (2.20% 2027 Notes) [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 2.20%   2.20%
Notes | 1.65% notes due 2028 (1.65% 2028 Notes) [Member}      
Debt Instrument [Line Items]      
Interest rate, stated percentage 1.65%   1.65%
Notes | 2.00% notes due 2032 (2.00% 2032 Notes) [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 2.00%   2.00%
Notes | 2.80% notes due 2041 (2.80% 2041 Notes) [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 2.80%   2.80%
Notes | 3.00% notes due 2052 (3.00% 2052 Notes)      
Debt Instrument [Line Items]      
Interest rate, stated percentage 3.00%   3.00%
Notes | 5.25% notes due 2025 (5.25% 2025 Notes) [Member]      
Debt Instrument [Line Items]      
Face amount $ 2,000,000,000    
Percentage of Principal Amount of Notes that may be Paid if Horizon Acquisition Does Not Occur 101.00%    
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%    
Interest rate, stated percentage 5.25%   5.25%
Notes | 5.15% notes due 2028 (5.15% 2028 Notes) [Member]      
Debt Instrument [Line Items]      
Face amount $ 3,750,000,000    
Percentage of Principal Amount of Notes that may be Paid if Horizon Acquisition Does Not Occur 101.00%    
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%    
Interest rate, stated percentage 5.15%   5.15%
Notes | 5.25% notes due 2030 (5.25% 2030 Notes) [Member]      
Debt Instrument [Line Items]      
Face amount $ 2,750,000,000    
Percentage of Principal Amount of Notes that may be Paid if Horizon Acquisition Does Not Occur 101.00%    
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%    
Interest rate, stated percentage 5.25%   5.25%
Notes | 5.25% notes due 2033 (5.25% 2033 Notes) [Member]      
Debt Instrument [Line Items]      
Face amount $ 4,250,000,000    
Percentage of Principal Amount of Notes that may be Paid if Horizon Acquisition Does Not Occur 101.00%    
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%    
Interest rate, stated percentage 5.25%   5.25%
Notes | 5.60% notes due 2043 (5.60% 2043 Notes) [Member]      
Debt Instrument [Line Items]      
Face amount $ 2,750,000,000    
Percentage of Principal Amount of Notes that may be Paid if Horizon Acquisition Does Not Occur 101.00%    
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%    
Interest rate, stated percentage 5.60%   5.60%
Notes | 5.65% notes due 2053 (5.65% 2053 Notes) [Member]      
Debt Instrument [Line Items]      
Face amount $ 4,250,000,000    
Percentage of Principal Amount of Notes that may be Paid if Horizon Acquisition Does Not Occur 101.00%    
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%    
Interest rate, stated percentage 5.65%   5.65%
Notes | 5.75% notes due 2063 (5.75% 2063 Notes) [Member]      
Debt Instrument [Line Items]      
Face amount $ 2,750,000,000    
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%    
Interest rate, stated percentage 5.75%   5.75%
Notes | 6.90% notes due 2038 (6.90% 2038 Notes) [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 6.90%   6.90%
Notes | 0.41% CHF700 million bonds due 2023 (0.41% 2023 Swiss franc Bonds)      
Debt Instrument [Line Items]      
Face amount | SFr     SFr 700,000,000
Interest rate, stated percentage 0.41%   0.41%
Notes | 5.507% notes due 2026 (5.507% 2026 Notes) [Member]      
Debt Instrument [Line Items]      
Face amount $ 1,500,000,000    
Percentage of Principal Amount of Notes that may be Paid if Horizon Acquisition Does Not Occur 101.00%    
Percentage of Principal Amount of Notes that may be Paid Upon Occurrence of Change in Control Triggering Event 101.00%    
Interest rate, stated percentage 5.507%   5.507%
Notes | 3.15% notes due 2040 (3.15% 2040 Notes) [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 3.15%   3.15%
Notes | 3.375% notes due 2050 (3.375% 2050 Notes) [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 3.375%   3.375%
Debt Securities Payable | 5.507% notes due 2026 (5.507% 2026 Notes) [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Redemption Period without Payment of Make Whole Amount 2 years    
Line of Credit      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 4,000,000,000    
Amount by which borrowing capacity under a syndicated unsecured revolving credit agreement may be increased upon our request at discretion of banks $ 1,250,000,000    
Line of Credit Facility, Initial Commitment Term 5 years    
Line of Credit Facility, Number Of Renewal Options | renewal_option 2    
Line of Credit Facility, Extension of Commitment Term 1 year    
Long-Term Line of Credit $ 0 0  
Line of Credit | Secured overnight financing rate | Variable Rate Component One      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.01%    
Line of Credit | Secured overnight financing rate | Variable Rate Component Two      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.10%    
Line of Credit | Federal Funds Purchased      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.50%    
prior line of credit      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   2,500,000,000  
Amount by which borrowing capacity under a syndicated unsecured revolving credit agreement may be increased upon our request at discretion of banks   750,000,000  
bridge credit agreement | Horizon Therapeutics      
Debt Instrument [Line Items]      
Bridge credit agreement amount $ 0 $ 0  
Minimum | Debt Securities Payable      
Debt Instrument [Line Items]      
Debt Instrument, Redemption Period without Payment of Make Whole Amount 2 months    
Maximum | Debt Securities Payable      
Debt Instrument [Line Items]      
Debt Instrument, Redemption Period without Payment of Make Whole Amount 6 months