Trade Accounts Receivable (Tables)

3 Months Ended

Jun. 30, 2012

Trade Accounts Receivable [Abstract]

Components of trade accounts receivable, net

	June 30, 2012			March 31, 2012
	(in millions)
Accounts receivable – billed	$	450		$	812
Accounts receivable – unbilled		44			80
Other receivables		14			26
Less: Allowances		(17	)		(16	)
Trade accounts receivable, net	$	491		$	902