Other Financial Data (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		20 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Mar. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Financial Data [Line Items]
Cash and cash equivalents	$ 1,470,000,000	$ 1,720,000,000	$ 1,470,000,000	$ 1,468,000,000	$ 1,881,000,000
Restricted cash and cash equivalents	62,000,000		62,000,000	63,000,000
Depreciation expense	45,000,000	46,000,000
Stockholders' Equity Note [Abstract]
Repurchase of common shares, value	357,000,000
Repurchase of common shares	5.9
Repurchase of common shares, average cost per share	$ 60.27
Share repurchase authority utilized during period			3,900,000,000
Share repurchase program, available for repurchases	1,100,000,000
Payment of dividends	$ 72,000,000	$ 70,000,000
Stock Options [Member]
Other Financial Data [Line Items]
Stock options excluded from computation of dilutive shares due to antidilutive nature	4.5	5.8