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Equity (Narrative) (Details) (USD $)
Share data in Millions, unless otherwise specified
0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 23, 2010
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Oct. 01, 2011
Dec. 31, 2011
Equity [Abstract]            
Anti-dilutive potential common shares excluded from reconciliation   16 5 17 4  
Stock repurchase program, authorized amount $ 2,500,000,000          
Stock repurchase program, number of years 3 years          
Common stock repurchases shares       1 13  
Common stock repurchases value       $ 63,000,000 $ 688,000,000 $ 793,000,000