Financing (Narrative) (Details) € in Millions	3 Months Ended
	Mar. 28, 2025 USD ($)	Mar. 28, 2025 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)
Debt Instrument [Line Items]
Debt discounts, premiums and debt issuance costs	$ 93,000,000		$ 96,000,000
Long-term debt	15,976,000,000		15,500,000,000
Borrowings outstanding	16,477,000,000		16,005,000,000
Multi-year Credit Facility | Revolving credit facility | Line of credit
Debt Instrument [Line Items]
Line of credit facility	5,000,000,000
Euro Denominated Commercial Paper and 2026 Biopharma Euro Notes
Debt Instrument [Line Items]
Long-term debt	$ 2,400,000,000
Euro-denominated commercial paper | Commercial paper
Debt Instrument [Line Items]
Weighted average interest rate of long-term debt, interest rate	2.80%	2.80%
Weighted average maturity of long-term debt, at point in time	42 days
Borrowings outstanding	$ 1,008,000,000	€ 931	$ 965,000,000	€ 931
U.S. dollar-denominated commercial paper | Commercial paper
Debt Instrument [Line Items]
Borrowings outstanding	$ 0