v3.7.0.1
Changes in Balance of Accumulated Other Comprehensive Loss, Net of Income Taxes (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 25, 2017
Jun. 26, 2016
Jun. 25, 2017
Jun. 26, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 1,606 $ 3,097
Other comprehensive income (loss) before reclassifications     56 (7)
Amounts reclassified from AOCL        
Recognition of net actuarial losses [1]     516 469
Amortization of net prior service credits [1]     (114) (123)
Other     7 1
Total reclassified from AOCL     409 347
Other comprehensive income, net of tax $ 255 $ 150 465 340
Ending Balance 1,349 2,997 1,349 2,997
Postretirement Benefit Plan Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (11,981) (11,314)
Other comprehensive income (loss) before reclassifications     3  
Amounts reclassified from AOCL        
Recognition of net actuarial losses 258 235 516 [1] 469 [1]
Amortization of net prior service credits (58) (62) (114) [1] (123) [1]
Total reclassified from AOCL 200 173 402 346
Other comprehensive income, net of tax     405 346
Ending Balance (11,576) (10,968) (11,576) (10,968)
Other, net        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (121) (130)
Other comprehensive income (loss) before reclassifications     53 (7)
Amounts reclassified from AOCL        
Other     7 1
Total reclassified from AOCL     7 1
Other comprehensive income, net of tax     60 (6)
Ending Balance (61) (136) (61) (136)
AOCI Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (12,102) (11,444)
Amounts reclassified from AOCL        
Other comprehensive income, net of tax     465 340
Ending Balance $ (11,637) $ (11,104) $ (11,637) $ (11,104)
[1] Reclassifications from AOCL related to our postretirement benefit plans were recorded as a component of net periodic benefit cost for each period presented (see "Note 6 - Postretirement Plans"). These amounts include $200 million and $173 million, net of tax, for the quarters ended June 25, 2017 and June 26, 2016, which are comprised of the recognition of net actuarial losses of $258 million and $235 million for the quarters ended June 25, 2017 and June 26, 2016 and the amortization of net prior service credits of $(58) million and $(62) million for the quarters ended June 25, 2017 and June 26, 2016.