v3.5.0.2
Changes in Balance of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 26, 2016
Jun. 28, 2015
Jun. 26, 2016
Jun. 28, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ (11,444) $ (11,870)
Other comprehensive loss before reclassifications     (7) (11)
Amounts reclassified from AOCL        
Recognition of net actuarial losses [1]     469 554
Amortization of net prior service credits [1]     (123) (129)
Other     1  
Total reclassified from AOCL     340 425
Other comprehensive income (loss), net of tax $ 150 $ 259 340 414
Ending balance (11,104) (11,456) (11,104) (11,456)
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 235 277 469 [1] 554 [1]
Amortization of net prior service credits (62) (64) (123) [1] (129) [1]
Total reclassified from AOCL 173 213 346 425
Other comprehensive income (loss), net of tax     346 425
Ending balance (10,968) (11,388) (10,968) (11,388)
Other, net        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (130) (57)
Other comprehensive loss before reclassifications     (7) (11)
Amounts reclassified from AOCL        
Other     1  
Total reclassified from AOCL     (6)  
Other comprehensive income (loss), net of tax     (6) (11)
Ending balance $ (136) $ (68) $ (136) $ (68)
[1] Reclassifications from AOCL, net of tax, related to our postretirement benefit plans were recorded as a component of net periodic benefit cost for each period presented (Note 7). These amounts include $173 million and $213 million for the quarters ended June 26, 2016 and June 28, 2015, which are comprised of the recognition of net actuarial losses of $235 million and $277 million for the quarters ended June 26, 2016 and June 28, 2015 and the amortization of net prior service (credits) costs of $(62) million and $(64) million for the quarters ended June 26, 2016 and June 28, 2015.