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Financial Instruments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Aug. 01, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of derivative assets	$ 2,899	$ 1,597
Fair value of derivative liabilities	1,725	1,559
Maximum \| Clif Bar
Derivative Instruments, Gain (Loss) [Line Items]
Contingent consideration arrangement, additional consideration to be paid, maximum			$ 2,400
Minimum \| Clif Bar
Derivative Instruments, Gain (Loss) [Line Items]
Contingent consideration arrangement, additional consideration to be paid, minimum			$ 0
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, aggregate notional value	5,336	2,384
Net investment hedge contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, aggregate notional value	8,647	7,456
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	$ (31)
Hedged forecasted transaction period	4 years
Net Investment Hedging \| Net investment hedge contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, aggregate notional value	$ 8,600
Other current assets
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of derivative assets	2,545	1,347
Other assets
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of derivative assets	354	250
Other Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of derivative liabilities	1,641	1,209
Other Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of derivative liabilities	$ 84	$ 350