Investment in Master Trust - Schedule of Fair Values of Investments and Other Assets and Liabilities of the Master Trust (Details) - EBP 001 [Member] - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Master Trust Balances [Member]
Investments at fair value:
Master Trust Net Assets, at fair value	$ 520,933,460	$ 450,960,939
Net appreciation in fair value of investments	63,862,884
Interest and dividends	14,161,694
Total investment income	78,024,578
Master Trust Balances [Member] \| Mutual funds [Member]
Investments at fair value:
Master Trust Net Assets, at fair value	492,178,626	420,451,141
Master Trust Balances [Member] \| Diageo common stock fund [Member]
Investments at fair value:
Master Trust Net Assets, at fair value	7,178,745	11,048,269
Master Trust Balances [Member] \| Money market funds [Member]
Investments at fair value:
Master Trust Net Assets, at fair value	21,576,089	19,461,529
Plan’s Interest in Master Trust Balances [Member]
Investments at fair value:
Master Trust Net Assets, at fair value	505,368,161	437,783,322
Plan’s Interest in Master Trust Balances [Member] \| Mutual funds [Member]
Investments at fair value:
Master Trust Net Assets, at fair value	477,607,770	408,185,999
Plan’s Interest in Master Trust Balances [Member] \| Diageo common stock fund [Member]
Investments at fair value:
Master Trust Net Assets, at fair value	7,028,436	10,871,556
Plan’s Interest in Master Trust Balances [Member] \| Money market funds [Member]
Investments at fair value:
Master Trust Net Assets, at fair value	$ 20,731,955	$ 18,725,767

Amount of increase (decrease) in net asset available for benefit from realized and unrealized gain (loss) on investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

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Fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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