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Changes in Balance of Accumulated Other Comprehensive Loss, Net of Income Taxes (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning Balance |  | $ 3,097 |  | $ 3,400 |  | $ 4,918 |
Other comprehensive loss before reclassifications |  | (1,232) |  | (424) |  | (2,973) |
Amounts reclassified from AOCL |  |  |  |  |  |  |
Recognition of net actuarial losses |  | 938 |  | 1,109 |  | 806 |
Amortization of net prior service credits |  | (239) |  | (259) |  | (100) |
Recognition of net prior service credits from divestiture of IS&GS segment | [1] | (134) |  |  |  |  |
Other |  | 9 | [1] |  |  | (2) |
Total reclassified from AOCL |  | 574 |  | 850 |  | 704 |
Other comprehensive (loss) income, net of tax |  | (658) |  | 426 |  | (2,269) |
Ending Balance |  | 1,606 |  | 3,097 |  | 3,400 |
Postretirement Benefit Plan Adjustments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning Balance |  | (11,314) |  | (11,813) | [2] | (9,649) | [2]
Other comprehensive loss before reclassifications |  | (1,232) |  | (351) |  | (2,870) |
Amounts reclassified from AOCL |  |  |  |  |  |  |
Recognition of net actuarial losses |  | 938 |  | 1,109 |  | 806 |
Amortization of net prior service credits |  | (239) |  | (259) |  | (100) |
Recognition of net prior service credits from divestiture of IS&GS segment | [1] | (134) |  |  |  |  |
Total reclassified from AOCL |  | 565 |  | 850 |  | 706 |
Other comprehensive (loss) income, net of tax |  | (667) |  | 499 |  | (2,164) |
Ending Balance |  | (11,981) | [2] | (11,314) |  | (11,813) | [2]
Other, net |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning Balance |  | (130) |  | (57) | [2] | 48 | [2]
Other comprehensive loss before reclassifications |  |  |  | (73) |  | (103) |
Amounts reclassified from AOCL |  |  |  |  |  |  |
Other |  | 9 | [1] |  |  | (2) |
Total reclassified from AOCL |  | 9 |  |  |  | (2) |
Other comprehensive (loss) income, net of tax |  | 9 |  | (73) |  | (105) |
Ending Balance |  | (121) | [2] | (130) |  | (57) | [2]
AOCI Attributable to Parent |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning Balance |  | (11,444) |  | (11,870) | [2] | (9,601) | [2]
Amounts reclassified from AOCL |  |  |  |  |  |  |
Other comprehensive (loss) income, net of tax |  | (658) |  | 426 |  | (2,269) |
Ending Balance |  | $ (12,102) | [2] | $ (11,444) |  | $ (11,870) | [2]
[1] | Associated with the divesture of the IS&GS business and included in net gain on divestiture of discontinued operations.
[2] | AOCL related to postretirement benefit plans is shown net of tax benefits at December 31, 2016, 2015 and 2014 of $6.5 billion, $6.2 billion and $6.4 billion. These tax benefits include amounts recognized on our income tax returns as current deductions and deferred income taxes, which will be recognized on our tax returns in future years. See "Note 9 - Income Taxes" and "Note 11 -Postretirement Plans" for more information on our income taxes and postretirement benefit 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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