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Changes in Balance of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 27, 2016
Mar. 29, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ (11,444) $ (11,870)
Other comprehensive loss before reclassifications 15 (54)
Amounts reclassified from AOCL    
Recognition of net actuarial losses [1] 234 277
Amortization of net prior service credits [1] (61) (65)
Other 2 (3)
Total reclassified from AOCL 175 209
Other comprehensive income, net of tax 190 155
Ending balance (11,254) (11,715)
Postretirement Benefit Plan Adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (11,314) (11,813)
Amounts reclassified from AOCL    
Recognition of net actuarial losses [1] 234 277
Amortization of net prior service credits [1] (61) (65)
Total reclassified from AOCL 173 212
Other comprehensive income, net of tax 173 212
Ending balance (11,141) (11,601)
Other, net    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (130) (57)
Other comprehensive loss before reclassifications 15 (54)
Amounts reclassified from AOCL    
Other 2 (3)
Total reclassified from AOCL 2 (3)
Other comprehensive income, net of tax 17 (57)
Ending balance $ (113) $ (114)
[1] Reclassifications from AOCL related to our postretirement benefit plans were recorded as a component of net periodic benefit cost for each period presented (Note 7).