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Shareholders' Equity - Reclassifications Out of AOCI (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 29, 2014
Jun. 30, 2013
Equity [Abstract]    
Recognized net actuarial loss (before tax) $ 153 $ 224
Amortization of prior service credit (before tax) $ 35 $ 26