Accounting policies (Details) - Walgreens Boots Alliance, Inc. $ / shares in Units, $ in Millions	Mar. 06, 2025 USD ($) right $ / shares
Blazing Star Parent, LLC
Business Combination [Line Items]
Business acquisition, share price (in USD per share) | $ / shares	$ 11.45
Divested asset proceed right | right	1
Net proceeds acquired, percentage	70.00%
Divested asset proceed right price | $ / shares	$ 3.00
Termination fee payable by acquirer	$ 560
Documented out-of-pocket expenses	30
Blazing Star Parent, LLC | Minimum
Business Combination [Line Items]
Termination fee payable by acquirer, acquirer terminated	158
Blazing Star Parent, LLC | Maximum
Business Combination [Line Items]
Termination fee payable by acquirer, acquirer terminated	$ 316
Stefano Pessina
Business Combination [Line Items]
Equity ownership, excluding consolidated entity and equity method investee, percentage	17.00%