Debt and Financing Activities Debt and Financing Activities (Celesio Debt) (Narrative) (Details)			3 Months Ended		3 Months Ended			3 Months Ended		3 Months Ended
	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Jun. 30, 2014 Accounts Receivable Factoring Facility [Member] Celesio [Member] USD ($)	Mar. 31, 2014 Accounts Receivable Factoring Facility [Member] Celesio [Member] USD ($)	Jun. 30, 2014 Revolving Credit Facility [Member] USD ($)	Jun. 30, 2013 Revolving Credit Facility [Member] USD ($)	Mar. 31, 2014 Revolving Credit Facility [Member] USD ($)	Jun. 30, 2014 Revolving Credit Facility [Member] Celesio [Member] USD ($)	Mar. 31, 2014 Revolving Credit Facility [Member] Celesio [Member] USD ($)	Jun. 30, 2014 Revolving Credit Facility Due February Two Thousand Eighteen [Member] Revolving Credit Facility [Member] Celesio [Member] USD ($)	Jun. 30, 2014 Revolving Credit Facility Due February Two Thousand Eighteen [Member] Revolving Credit Facility [Member] Celesio [Member] EUR (€)	Mar. 31, 2014 Revolving Credit Facility Due February Two Thousand Eighteen [Member] Revolving Credit Facility [Member] Celesio [Member] USD ($)	Jun. 30, 2014 Corporate Bond Securities [Member] Celesio [Member] USD ($)	Mar. 31, 2014 Corporate Bond Securities [Member] Celesio [Member] USD ($)	Jun. 30, 2014 Four Percent Bonds Due October Eighteen Two Thousand Sixteen [Member] Celesio [Member] USD ($)	Mar. 31, 2014 Four Percent Bonds Due October Eighteen Two Thousand Sixteen [Member] Celesio [Member] USD ($)	Feb. 06, 2014 Four Percent Bonds Due October Eighteen Two Thousand Sixteen [Member] Celesio [Member]	Jun. 30, 2014 Four Point Five Percent Bonds Due April Twenty Six Two Thousand Seventeen [Member] Celesio [Member] USD ($)	Mar. 31, 2014 Four Point Five Percent Bonds Due April Twenty Six Two Thousand Seventeen [Member] Celesio [Member] USD ($)	Feb. 06, 2014 Four Point Five Percent Bonds Due April Twenty Six Two Thousand Seventeen [Member] Celesio [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage															4.00%	4.00%	4.00%	4.50%	4.50%	4.50%
Long-term Debt	$ 10,200,000,000	$ 10,400,000,000											$ 1,226,000,000		$ 500,000,000			$ 726,000,000
Current portion of long-term debt	25,000,000	1,424,000,000												1,244,000,000		507,000,000			737,000,000
Credit Facility Capacity			315,000,000		1,300,000,000			2,000,000,000			500,000,000
Line of Credit Facility, Expiration Date			Sep. 30, 2015		Sep. 23, 2016					Feb. 28, 2018
Proceeds from Lines of Credit			758,000,000		0	0		159,000,000		0
Repayments of Lines of Credit			746,000,000					30,000,000
Borrowings Outstanding			$ 258,000,000	$ 246,000,000	$ 0		$ 0	$ 321,000,000	$ 188,000,000	$ 0		$ 0