Earnings Per Share Attributable to Cardinal Health, Inc. (Reconciliation of Common Shares Used to Compute Basic and Diluted EPS) (Details) - shares shares in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Earnings Per Share [Abstract] | ||||
| Weighted-average common shares–basic (in shares) | 261 | 279 | 266 | 283 |
| Effect of dilutive securities: | ||||
| Employee stock options, restricted share units, and performance share units (in shares) | 0 | 2 | 0 | 2 |
| Weighted-average common shares–diluted (in shares) | 261 | 281 | 266 | 285 |