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Changes in Balance of Accumulated Other Comprehensive Loss, Net of Income Taxes (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 26, 2017 | Mar. 27, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 1,606 |  | $ 3,097
Other comprehensive income before reclassifications | 7 |  | 15
Amounts reclassified from AOCL |  |  |
Recognition of net actuarial losses | 258 | [1] | 234
Amortization of net prior service credits | (56) | [1] | (61)
Other | 1 |  | 2
Total reclassified from AOCL | 203 |  | 175
Other comprehensive income, net of tax | 210 |  | 190
Ending Balance | 1,585 |  | 3,177
Postretirement Benefit Plan Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (11,981) |  | (11,314)
Other comprehensive income before reclassifications | 3 |  |
Amounts reclassified from AOCL |  |  |
Recognition of net actuarial losses | 258 | [1] | 234
Amortization of net prior service credits | (56) | [1] | (61)
Total reclassified from AOCL | 202 |  | 173
Other comprehensive income, net of tax | 205 |  | 173
Ending Balance | (11,776) |  | (11,141)
Other, net |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (121) |  | (130)
Other comprehensive income before reclassifications | 4 |  | 15
Amounts reclassified from AOCL |  |  |
Other | 1 |  | 2
Total reclassified from AOCL | 1 |  | 2
Other comprehensive income, net of tax | 5 |  | 17
Ending Balance | (116) |  | (113)
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 | 210 |  | 190
Ending Balance | $ (11,892) |  | $ (11,254)
[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").

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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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