Business Combinations (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended		6 Months Ended	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Oct. 24, 2012 PSS World Medical [Member]	Jun. 30, 2012 Corporate Headquarters [Member]	Apr. 06, 2012 Corporate Headquarters [Member]	Sep. 30, 2012 Katz Group [Member]	Jun. 30, 2012 Building and Building Improvements [Member] Corporate Headquarters [Member]	Apr. 06, 2012 Building and Building Improvements [Member] Corporate Headquarters [Member]	Apr. 06, 2012 Land [Member] Corporate Headquarters [Member]	Sep. 30, 2012 Service Agreements [Member] Katz Group [Member]	Sep. 30, 2012 Trademarks And Trade Names [Member] Katz Group [Member]	Sep. 30, 2012 Amounts Recognized As Of Acquisition Date As Adjusted [Member] Katz Group [Member]
Business Acquisition [Line Items]
Price Per Share for Acquiring All Outstanding Shares					$ 29.00
Total Transaction Value					$ 2,100,000,000
Currently Acquired Percentage of Building							50.00%
Cash Paid for Acquisition							90,000,000							925,000,000
Previously Held Percentage of Building							50.00%
Gain on Business Combination	0	0	81,000,000	0		81,000,000
Gain on Business Combination, Net of Tax						51,000,000
Fair Value of Assets Acquired							180,000,000			113,000,000	58,000,000
Property, Plant and Equipment, Useful Life									P30Y
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets												318,000,000	114,000,000	442,000,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life								20 years
Goodwill														512,000,000
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount								$ 290,000,000