Debt (Long-term Debt Instruments) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Dec. 28, 2012	Mar. 30, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 2,629	$ 2,740
Less: short-term debt and current maturities of long-term debt	231	1,254
Total long-term debt	2,398	1,486
4.45% term notes, due September 2022
Debt Instrument [Line Items]
Long-term Debt	349	0
Debt Instrument, Interest Rate, Stated Percentage	4.45%	4.45%
Debt Instrument, Maturity Date	Sep. 15, 2022	Sep. 15, 2022
6.50% term notes, due March 2018
Debt Instrument [Line Items]
Long-term Debt	997	997
Debt Instrument, Interest Rate, Stated Percentage	6.50%	6.50%
Debt Instrument, Maturity Date	Mar. 31, 2018	Mar. 31, 2018
2.50% term notes, due September 2015
Debt Instrument [Line Items]
Long-term Debt	350	0
Debt Instrument, Interest Rate, Stated Percentage	2.50%	2.50%
Debt Instrument, Maturity Date	Sep. 15, 2015	Sep. 15, 2015
5.50% term notes, due March 2013
Debt Instrument [Line Items]
Long-term Debt	0	699
Debt Instrument, Interest Rate, Stated Percentage	5.50%	5.50%
Debt Instrument, Maturity Date	Mar. 31, 2013	Mar. 31, 2013
5.00% term notes, due February 2013
Debt Instrument [Line Items]
Long-term Debt	0	300
Debt Instrument, Interest Rate, Stated Percentage	5.00%	5.00%
Debt Instrument, Maturity Date	Feb. 28, 2013	Feb. 28, 2013
Capitalized lease liabilities
Debt Instrument [Line Items]
Long-term Debt	564	574
Borrowings for assets acquired under long-term financing
Debt Instrument [Line Items]
Long-term Debt	102	84
Other borrowings
Debt Instrument [Line Items]
Long-term Debt	$ 17	$ 86