Share-Based Compensation (Narrative) (Details) shares in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2026 USD ($) shares	Mar. 31, 2025 USD ($)	Mar. 31, 2026 USD ($) yr shares	Mar. 31, 2025 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit related to share-based compensation	$ 4,000,000	$ 4,000,000	$ 12,000,000	$ 11,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant \| shares	16,000		16,000
Total share-based compensation	$ 32,000,000	32,000,000	$ 93,000,000	91,000,000
Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)			3 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	88,000,000		$ 88,000,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			2 years
Total share-based compensation	21,000,000	18,000,000	$ 55,000,000	54,000,000
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	58,000,000		$ 58,000,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			2 years
Vesting Period in years for Shares \| yr			3
Total share-based compensation	11,000,000	14,000,000	$ 38,000,000	$ 37,000,000
Performance Share Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target performance goal (as a percent)			0.00%	0.00%
Performance Share Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target performance goal (as a percent)			240.00%	240.00%
GIA Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 490,000,000		$ 490,000,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years		4 years
Total share-based compensation		17,000,000		$ 17,000,000
Share-Based Payment Arrangement, Income, Decrease in Fair Value of Liabilities			$ 25,000,000
Share-Based Payment Arrangement, Acquisition Related Expense	$ 95,000,000	16,000,000	210,000,000	16,000,000
Share-Based Payment Arrangement, Non-Acquisition-Related Expense	$ 2,000,000	$ 1,000,000	$ 6,000,000	$ 1,000,000

CARDINAL HEALTH INC 10-Q