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Postretirement Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | $ 34,978 | $ 33,204 |
Aggregate liability for postemployment plans | 60 | 63 |
Actuarial losses and net prior service cost related to postretirement benefit plans expected to be recognized in net periodic benefit cost during 2017 | 1,500 |  |
Actuarial losses and net prior service cost related to postretirement benefit plans expected to be recognized in net periodic benefit cost during 2017, net of tax | 1,200 |  |
Expected pension plan expenses during next fiscal year | $ 1,400 |  |
Commingled equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period | 90 days |  |
Minimum | Private equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period | 8 years |  |
Minimum | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period | 8 years |  |
Minimum | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period | 1 month |  |
Maximum | Private equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period | 12 years |  |
Maximum | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period | 10 years |  |
Investments measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | $ 6,823 | 5,547 |
Investments measured at NAV | Private equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | 4,334 | 3,614 |
Investments measured at NAV | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | 1,611 | 1,411 |
Investments measured at NAV | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | 711 | 462 |
Nonqualified Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit pension plan, liabilities | 1,300 | 1,200 |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | 530 | 460 |
Unrecognized net actuarial losses | 646 | 642 |
Unrecognized prior service credit | 61 | 74 |
Benefit plan expense | 126 | 125 | $ 117
Qualified Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation for defined benefit pension plans | 48,500 | 44,900 |
Accumulated benefit obligation in excess of plan assets | 48,500 | 44,800 |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | 33,095 | 31,417 | $ 32,096
Unrecognized net actuarial losses | 20,169 | 20,184 |
Actuarial losses related to postretirement benefit plans expected to be recognized in net periodic benefit cost during 2017 | 1,400 |  |
Actuarial losses related to postretirement benefit plans expected to be recognized in net periodic benefit cost during 2017, net of tax | 1,100 |  |
Increase (decrease) in projected benefit obligations due to a change in discount rate | $ 2,900 | $ 1,400 |

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- Definition The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented, net of tax. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) net of tax expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension plan. Excludes other postretirement benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) 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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&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 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from 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 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: 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 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 of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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