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Postretirement Benefit Plans - 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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | $ (1,161) | $ (1,204) | $ (224)
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts | 1,030 | 938 | 1,109
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | (219) | (28) | (127)
Total Incurred but Not Recognized | (1,380) | (1,232) | (351)
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts | (228) | (230) | (243)
Total Reclassification Adjustment for Prior Period Amounts Recognized | 802 | 708 | 866
Reclassifications from divestiture of IS&GS business | 0 | (134) | 0
Discontinued Operations | Information Systems & Global Solutions |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts |  | (9) | (16)
Reclassifications from divestiture of IS&GS business |  | 134 |
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 | (1,172) | (1,236) | (291)
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts | 974 | 879 | 1,034
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | (219) | (54) | (18)
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts | (229) | (235) | (235)
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 | 77 | 94 | 46
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts | 12 | 22 | 28
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | 0 | 27 | (102)
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts | 10 | 14 | 2
Other plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | (66) | (62) | 21
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts | 44 | 37 | 47
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | 0 | (1) | (7)
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts | $ (9) | $ (9) | $ (10)

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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of business. + References No definition available. + Details
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- Definition Amount, after tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, 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=84228862&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=82843861&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=84228862&loc=d3e637-108580 + Details
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- Definition Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, 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=84228862&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=84228862&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 (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. + References Reference 1: 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=84228862&loc=d3e689-108580 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=82843861&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=84228862&loc=d3e637-108580 + Details
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