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Financial Instruments - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Aug. 01, 2022
Minimum \| Clif Bar
Derivative Instruments, Gain (Loss) [Line Items]
Possible payments, maximum							$ 0
Maximum \| Clif Bar
Derivative Instruments, Gain (Loss) [Line Items]
Possible payments, maximum							$ 2,400
Contingent Consideration
Derivative Instruments, Gain (Loss) [Line Items]
Liability value	$ 142	$ 167	$ 179	$ 661	$ 703	$ 680
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, aggregate notional value	2,089		$ 4,189
Cash flow hedges \| Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Expected transfer of losses (net of taxes) for interest rate cash flow hedges to earnings during the next 12 months	$ 57
Hedged forecasted transaction period	3 years 6 months
Net investment hedges \| Cross-currency swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, aggregate notional value	$ 9,300
Derivatives designated as accounting hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, aggregate notional value	$ 1,600