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Amounts Recognized in Other Comprehensive Income (Loss) Related to Postretirement Benefit Plans, Net of Tax (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] |  |  |  |
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost |  | $ (1,204) | $ (224) | $ (5,910)
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost |  | (28) | (127) | 3,040
Total Incurred but Not Recognized |  | (1,232) | (351) | (2,870)
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts |  | 938 | 1,109 | 806
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts | [1] | (230) | (243) | (89)
Total Reclassification Adjustment for Prior Period Amounts Recognized | [1] | 708 | 866 | 717
Qualified defined benefit pension plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost |  | (1,236) | (291) | (5,505)
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost |  | (54) | (18) | 2,959
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts |  | 879 | 1,034 | 758
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts | [1] | (235) | (235) | (87)
Retiree medical and life insurance plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost |  | 94 | 46 | (160)
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost |  | 27 | (102) | (3)
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts |  | 22 | 28 | 15
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts | [1] | 14 | 2 | 3
Other Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost |  | (62) | 21 | (245)
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost |  | (1) | (7) | 84
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts |  | 37 | 47 | 33
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts | [1] | $ (9) | $ (10) | $ (5)
[1] | Reflects the reclassification for discontinued operations presentation of benefits related to former IS&GS salaried employees ($9 million in 2016, $16 million in 2015 and $11 million in 2014). In addition, we recognized $134 million of prior service credits from the divestiture of our IS&GS business, which were reclassified as discontinued operations.

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- Definition Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Excluding Discontinued Operations, Net of Tax + References No definition available. + Details
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- Definition Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Excluding Discontinued Operations, Net of Tax + References No definition available. + Details
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- Definition Actuarial gains (losses) due to differences between actual experience and actuarial assumptions, and prior service credits (costs) from improvements or reductions in plan benefits, each of which occurred during the year and were recognized as a component of other comprehensive income (loss) at the end of the year. + References No definition available. + Details
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- Definition Amount after tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit). + References Reference 1: 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 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 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition Amount after tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 2: 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 Reference 3: 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 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) 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 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 Reference 3: 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 Reference 4: 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 + Details
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