Condensed Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2013		Dec. 31, 2012
Income Statement [Abstract]
Revenues	$ 34,306		$ 31,099		$ 99,468		$ 91,553
Cost of Sales	(32,466)		(29,454)		(93,699)		(86,664)
Gross Profit	1,840		1,645		5,769		4,889
Operating Expenses	(1,337)		(1,147)		(3,890)		(3,230)
Litigation Charges	(18)		0		(68)		(60)
Gain on business combination	0		0		0		81
Total Operating Expenses	(1,355)		(1,147)		(3,958)		(3,209)
Operating Income	485		498		1,811		1,680
Other Income (Loss), Net	(8)		10		7		28
Interest Expense	(69)		(59)		(187)		(170)
Income from Continuing Operations Before Income Taxes	408		449		1,631		1,538
Income Tax Expense	(252)		(143)		(639)		(454)
Income from Continuing Operations	156		306		992		1,084
Loss from discontinued operations, net of tax	(92)		(8)		(100)		(5)
Net Income	$ 64		$ 298		$ 892		$ 1,079
Diluted
Continuing operations	$ 0.67	[1]	$ 1.27	[1]	$ 4.26	[1]	$ 4.51	[1]
Discontinued operations	$ (0.39)	[1]	$ (0.03)	[1]	$ (0.43)	[1]	$ (0.02)	[1]
Total	$ 0.28	[1]	$ 1.24	[1]	$ 3.83	[1]	$ 4.49	[1]
Basic
Continuing operations	$ 0.68	[1]	$ 1.30	[1]	$ 4.34	[1]	$ 4.60	[1]
Discontinued operations	$ (0.40)	[1]	$ (0.03)	[1]	$ (0.44)	[1]	$ (0.02)	[1]
Total	$ 0.28	[1]	$ 1.27	[1]	$ 3.90	[1]	$ 4.58	[1]
Dividends Declared Per Common Share	$ 0.24		$ 0.20		$ 0.68		$ 0.60
Weighted Average Common Shares
Diluted	234		240		233		240
Basic	230		235		229		236

[1] Certain computations may reflect rounding adjustments.