Condensed Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Income Statement [Abstract]
Revenues	$ 32,954		$ 29,755		$ 65,162		$ 60,454
Cost of Sales	(30,945)		(28,072)		(61,233)		(57,210)
Gross Profit	2,009		1,683		3,929		3,244
Operating Expenses	(1,295)		(1,033)		(2,553)		(2,083)
Litigation Charges	(35)		(44)		(50)		(60)
Gain on Business Combination	0		0		0		81
Total Operating Expenses	1,330		1,077		2,603		2,062
Operating Income	679		606		1,326		1,182
Other Income, Net	9		10		15		18
Interest Expense	(59)		(55)		(118)		(111)
Income from Continuing Operations Before Income Taxes	629		561		1,223		1,089
Income Tax Expense	(213)		(162)		(387)		(311)
Income from Continuing Operations	416		399		836		778
Income (Loss) from Discontinued Operations, Net of Tax	(12)		2		(8)		3
Net Income	$ 404		$ 401		$ 828		$ 781
Diluted
Continuing operations	$ 1.79	[1]	$ 1.66	[1]	$ 3.60	[1]	$ 3.24	[1]
Discontinued operations	$ (0.05)	[1]	$ 0.01	[1]	$ (0.04)	[1]	$ 0.01	[1]
Total	$ 1.74	[1]	$ 1.67	[1]	$ 3.56	[1]	$ 3.25	[1]
Basic
Continuing operations	$ 1.82	[1]	$ 1.69	[1]	$ 3.67	[1]	$ 3.30	[1]
Discontinued operations	$ (0.06)	[1]	$ 0.01	[1]	$ (0.04)	[1]	$ 0.01	[1]
Total	$ 1.76	[1]	$ 1.70	[1]	$ 3.63	[1]	$ 3.31	[1]
Dividends Declared Per Common Share	$ 0.24		$ 0.20		$ 0.44		$ 0.40
Weighted Average Common Shares
Diluted	233		240		232		240
Basic	229		236		228		236

[1] Certain computations may reflect rounding adjustments.