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Postretirement Benefit Plans - Amounts Recognized on Balance Sheets Related to Qualified Defined Benefit Pension Plans and Retiree Medical and Life Insurance Plans (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |
Accrued postretirement benefit liabilities | $ (11,410) | $ (15,703)
Accumulated other comprehensive loss (pre-tax) related to: |  |
Accumulated other comprehensive loss, after tax | 14,300 | 12,600
Qualified Defined Benefit Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Prepaid pension asset | 107 | 112
Accrued postretirement benefit liabilities | (11,410) | (15,703)
Accumulated other comprehensive loss (pre-tax) related to: |  |
Net actuarial losses | 19,117 | 20,169
Prior service (credit) cost | (1,931) | (2,263)
Total | 17,186 | 17,906
Accumulated other comprehensive loss, after tax | 13,500 | 11,800
Adjustments, before tax | 17,186 | 17,906
Retiree Medical and Life Insurance Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Prepaid pension asset | 0 | 0
Accrued postretirement benefit liabilities | (704) | (719)
Accumulated other comprehensive loss (pre-tax) related to: |  |
Net actuarial losses | 236 | 331
Prior service (credit) cost | 167 | 81
Total | 403 | 412
Accumulated other comprehensive loss, after tax | 316 | 252
Adjustments, before tax | 403 | 412
Other Pension Plan |  |
Accumulated other comprehensive loss (pre-tax) related to: |  |
Total | 542 | 705
Accumulated other comprehensive loss, after tax | 428 | 479
Adjustments, before tax | $ 542 | $ 705

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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 + Details
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