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Segments Of Business (Geographic Segments Assets) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Segment Reporting Information [Line Items]
Segment Reporting Revenue by Country	$ 31,699	$ 30,839	$ 30,216	$ 29,980	$ 28,853	$ 28,247	$ 27,534	$ 27,450	$ 122,734	$ 112,084	$ 108,702
Property, Plant and Equipment, Net	1,043				991				1,043	991	851
United States [Member]
Segment Reporting Information [Line Items]
Segment Reporting Revenue by Country									112,230	102,089	99,387
Property, Plant and Equipment, Net	952				901				952	901	764
International [Member]
Segment Reporting Information [Line Items]
Segment Reporting Revenue by Country									10,504	9,995	9,315
Property, Plant and Equipment, Net	$ 91				$ 90				$ 91	$ 90	$ 87

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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