Share-Based Compensation (Summary Of Share-Based Payment Awards Outstanding) (Details) In Millions, unless otherwise specified	Mar. 31, 2012
CareFusion Awards Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Held by our employees and former employees	5.0
Cardinal Health Awards Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Held by our employees and former employees	21.1
Held by CareFusion employees	1.2
Total	22.3