Receivables (Details) (USD $) In Millions, unless otherwise specified	Mar. 30, 2012	Apr. 01, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, net	$ 3,257	$ 3,719
Unbilled recoverable amounts primarily from governments that are expected to be collected after one year	78
Billed trade accounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, net	1,794	2,026
Unbilled recoverable amounts under contracts in progress [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, net	1,300	1,521
Other receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, net	$ 163	$ 172