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Noncontrolling Interests Noncontrolling Interests (Changes in Noncontrolling Interests) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Noncontrolling Interest [Line Items]        
Noncontrolling interests, beginning     $ 1,796  
Net income attributable to noncontrolling interests 8 0 16 0
Other comprehensive income     (151)  
Purchase of noncontrolling interests     (63)  
Dividends paid to noncontrolling interest shareholders     (16)  
Other     13  
Noncontrolling interests, ending 1,595   1,595  
Celesio [Member]
       
Noncontrolling Interest [Line Items]        
Purchase of noncontrolling interests     (35)  
Dividends paid to noncontrolling interest shareholders     $ (16)