Equity - Additional Information (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 29, 2012	Mar. 31, 2012	Dec. 31, 2011
Stockholders Equity Note [Line Items]
Dividend declared	$ 1,300,000,000
Dividend declared, per share	$ 0.75
Dividend, declaration date	Nov. 28, 2012
Dividend, record date	Dec. 10, 2012
Dividend, payment date	Dec. 28, 2012
Dividend paid	1,300,000,000	1,100,000,000	0
Dividend paid, per share		$ 0.60
Common stock repurchases	$ 1,044,000,000		$ 800,000,000
Common stock repurchases, shares	21
Remaining shares authorized for repurchase	211