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Financial Instruments (Details) (Gain (Loss) from Hedging Transactions) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Cost of sales $ (710) $ (943) $ (1,414) $ (1,853)
Research and development (235) (277) (477) (556)
Marketing, general and administrative (134) (154) (265) (310)
Other expense, net (3) (49) (3) (69)
Contracts designated as cash flow hedging instruments        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net [Abstract]        
Other comprehensive loss 7 5 0 4
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Cost of sales 0 0 (1) 0
Research and development (2) (1) (4) (2)
Marketing, general and administrative (2) 0 (3) (1)
Not Designated as Hedging Instruments        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Other expense, net $ 0 $ 1 $ (1) $ 0