Business Combinations (Fair Value Of Assets Acquired And Liabilities Assumed) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		6 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2014 Celesio [Member]	Feb. 06, 2014 Celesio [Member]
Business Acquisition [Line Items]
Receivables			$ 3,417	$ 3,425	[1]
Measurement period adjustments, receivables			(8)
Other current assets, net of cash and cash equivalents acquired			2,410	2,413	[1]
Measurement period adjustments, other current assets, net of cash and cash equivalents acquired			(3)
Goodwill	10,095	9,927	3,984	3,570	[1]
Measurement period adjustments, goodwill	419		414
Intangible assets			2,482	3,018	[1]
Measurement period adjustments, intangible assets			(536)
Other long-term assets			1,229	1,272	[1]
Measurement period adjustments, other long-term assets			(43)
Current liabilities			(4,094)	(4,096)	[1]
Measurement period adjustments, current liabilities			2
Short-term borrowings and current portion of long-term debt			(1,990)	(1,990)	[1]
Measurement period adjustments, short-term borrowings			0
Long-term debt			(322)	(322)	[1]
Measurement period adjustments, , long-term debt			0
Other long-term liabilities			(1,134)	(1,293)	[1]
Measurement period adjustments, other long-term liabilities			159
Fair value of net assets, less cash and cash equivalents			5,982	5,997	[1]
Measurement period adjustments, fair value of net assets			(15)
Less: Noncontrolling Interests			(1,485)	(1,500)	[1]
Measurement period adjustments, less: noncontrolling interest			15
Net assets acquired, less cash and cash equivalents			4,497	4,497	[1]
Measurement period adjustments, net assets acquired			$ 0

[1] (1)As previously reported in our Form 10-K for the year ended March 31, 2014.