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Shareholders' Equity - Reclassifications Out of AOCI (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 28, 2014
Sep. 29, 2013
Equity [Abstract]    
Recognized net actuarial loss (before tax) $ 228 $ 336
Amortization of prior service credit (before tax) $ 51 $ 40