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Basis of Presentation and Summary of Significant Accounting Policies (Revision Of Consolidated Statements of Shareholders' Equity/(Deficit)) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Total shareholders’ deficit             $ (3,212) $ (2,957) $ (882) $ 1,623
Net earnings/(loss) attributable to Cardinal Health, Inc. $ 261 $ 368 $ (12) $ 365 $ (77) $ 98 852 330 (938)  
Net earnings/(loss) 262 369 (11) 367 (77) 99 853 331 (937)  
Employee stock plans activity, net of shares withheld for employee taxes             164 157 64  
Share repurchase program activity             (759) (2,007) (1,000)  
Other             (1) (1) 0  
Common Shares                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Total shareholders’ deficit             2,917 2,746 2,813 2,806
Net earnings/(loss) attributable to Cardinal Health, Inc.               0 0  
Employee stock plans activity, net of shares withheld for employee taxes             71 33 7  
Share repurchase program activity               (100)    
Other               0 0  
Retained Earnings/(Accumulated Deficit)                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Total shareholders’ deficit             (286) (642) (456) 1,033
Net earnings/(loss) attributable to Cardinal Health, Inc.             852 330 (938)  
Employee stock plans activity, net of shares withheld for employee taxes               0 0  
Share repurchase program activity               0    
Other               (1) 1  
Treasury Shares                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Total shareholders’ deficit               (4,911) (3,128) (2,185)
Net earnings/(loss) attributable to Cardinal Health, Inc.               0 0  
Employee stock plans activity, net of shares withheld for employee taxes             93 124 57  
Share repurchase program activity             $ (859) (1,907) (1,000)  
Other               0 0  
As Reported                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Total shareholders’ deficit               (2,851) (706) 1,794
Net earnings/(loss) attributable to Cardinal Health, Inc. 258 353 5 345 (130) 110   261 (933)  
Net earnings/(loss) 259 354 6 347 (130) 111   262 (932)  
Employee stock plans activity, net of shares withheld for employee taxes               55 65  
Share repurchase program activity               (1,907)    
Other               0 (1)  
As Reported | Common Shares                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Total shareholders’ deficit               2,747 2,813 2,806
Net earnings/(loss) attributable to Cardinal Health, Inc.               0 0  
Employee stock plans activity, net of shares withheld for employee taxes               (66) 7  
Share repurchase program activity               0    
Other               0 0  
As Reported | Retained Earnings/(Accumulated Deficit)                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Total shareholders’ deficit               (534) (280) 1,205
Net earnings/(loss) attributable to Cardinal Health, Inc.               261 (933)  
Employee stock plans activity, net of shares withheld for employee taxes               0 0  
Share repurchase program activity               0    
Other               0 0  
As Reported | Treasury Shares                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Total shareholders’ deficit               (4,914) (3,128) (2,186)
Net earnings/(loss) attributable to Cardinal Health, Inc.               0 0  
Employee stock plans activity, net of shares withheld for employee taxes               121 58  
Share repurchase program activity               (1,907)    
Other               0 0  
Adjustment                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Total shareholders’ deficit               (106) (176) (171)
Net earnings/(loss) attributable to Cardinal Health, Inc. 3 15 (17) 20 53 (12)   69 (5)  
Net earnings/(loss) $ 3 $ 15 $ (17) $ 20 $ 53 $ (12)   69 (5)  
Employee stock plans activity, net of shares withheld for employee taxes               102 (1)  
Share repurchase program activity               (100)    
Other               (1) 1  
Adjustment | Common Shares                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Total shareholders’ deficit               (1) 0 0
Net earnings/(loss) attributable to Cardinal Health, Inc.               0 0  
Employee stock plans activity, net of shares withheld for employee taxes               99 0  
Share repurchase program activity               (100)    
Other               0 0  
Adjustment | Retained Earnings/(Accumulated Deficit)                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Total shareholders’ deficit               (108) (176) (172)
Net earnings/(loss) attributable to Cardinal Health, Inc.               69 (5)  
Employee stock plans activity, net of shares withheld for employee taxes               0 0  
Share repurchase program activity               0    
Other               (1) 1  
Adjustment | Treasury Shares                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Total shareholders’ deficit               3 0 $ 1
Net earnings/(loss) attributable to Cardinal Health, Inc.               0 0  
Employee stock plans activity, net of shares withheld for employee taxes               3 (1)  
Share repurchase program activity               0    
Other               $ 0 $ 0