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Changes in Balance of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 25, 2016 | Sep. 27, 2015 | Sep. 25, 2016 | Sep. 27, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Total reclassified from AOCL, net of tax |  |  |  | $ 499 |  | $ 637 |
Recognition of net actuarial losses | [1] |  |  | 703 |  | 831 |
Amortization of net prior service cost (credits) | [1] |  |  | (182) |  | (194) |
Postretirement Benefit Plan Adjustments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Total reclassified from AOCL, net of tax |  | $ 175 | $ 212 | 387 |  | 637 |
Recognition of net actuarial losses |  | 234 | 277 | 703 | [1] | 831 | [1]
Amortization of net prior service cost (credits) |  | $ (59) | $ (65) | $ (182) | [1] | $ (194) | [1]
[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 $175 million and $212 million for the quarters ended September 25, 2016 and September 27, 2015, which are composed of the recognition of net actuarial losses of $234 million and $277 million for the quarters ended September 25, 2016 and September 27, 2015 and the amortization of net prior service (credits) costs of $(59) million and $(65) million for the quarters ended September 25, 2016 and September 27, 2015.

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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 + Details
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