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Postretirement Benefit Plans - Reconciliation of Benefit Obligations, Plan Assets, and Unfunded or Funded Status (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Change in plan assets |  |  |
Beginning balance at fair value | $ 40,566 |  |
Ending balance at fair value | 37,361 | $ 40,566 |
Changes in longevity assumptions | 250 |  |
Qualified Defined Benefit Pension Plans |  |  |
Change in benefit obligation |  |  |
Beginning balance | 51,352 | 48,674 |
Service cost | 106 | 101 | $ 516
Interest cost | 1,220 | 1,538 | 1,806
Actuarial losses (gains) | (2,045) | 4,610 |
Settlements | (4,885) | (1,392) |
Plan amendments and curtailments | 2 | 9 |
Benefits paid | (2,303) | (2,188) |
Medicare Part D subsidy | 0 | 0 |
Participants’ contributions | 0 | 0 |
Ending balance | 43,447 | 51,352 | 48,674
Change in plan assets |  |  |
Beginning balance at fair value | 38,481 | 35,442 |
Actual return on plan assets | 3,899 | 5,594 |
Settlements | (4,885) | (1,392) |
Benefits paid | (2,303) | (2,188) |
Company contributions | 0 | 1,025 |
Medicare Part D subsidy | 0 | 0 |
Participants’ contributions | 0 | 0 |
Ending balance at fair value | 35,192 | 38,481 | $ 35,442
Net (unfunded) funded status of the plans | $ (8,255) | $ (12,871) |
Weighted average discount rate | 2.875% | 2.50% | 3.25%
Actual return on plan assets (percent) | 10.50% |  |
Qualified Defined Benefit Pension Plans | Qualified Plan |  |  |
Change in plan assets |  |  |
Weighted average discount rate | 2.875% | 2.50% |
Increased (decrease) in benefit obligation |  | $ 2,300 |
Retiree Medical and Life Insurance Plans |  |  |
Change in benefit obligation |  |  |
Beginning balance | $ 2,271 | 2,226 |
Service cost | 13 | 13 | $ 14
Interest cost | 53 | 70 | 97
Actuarial losses (gains) | (352) | 117 |
Settlements | 0 | 0 |
Plan amendments and curtailments | 0 | (8) |
Benefits paid | (217) | (220) |
Medicare Part D subsidy | 4 | 3 |
Participants’ contributions | 67 | 70 |
Ending balance | 1,839 | 2,271 | 2,226
Change in plan assets |  |  |
Beginning balance at fair value | 2,085 | 1,889 |
Actual return on plan assets | 224 | 298 |
Settlements | 0 | 0 |
Benefits paid | (217) | (220) |
Company contributions | 6 | 45 |
Medicare Part D subsidy | 4 | 3 |
Participants’ contributions | 67 | 70 |
Ending balance at fair value | 2,169 | 2,085 | $ 1,889
Net (unfunded) funded status of the plans | $ 330 | $ (186) |
Weighted average discount rate | 2.75% | 2.375% | 3.25%
Retiree Medical and Life Insurance Plans | Qualified Plan |  |  |
Change in plan assets |  |  |
Weighted average discount rate | 2.75% | 2.375% |
Increased (decrease) in benefit obligation | $ 70 |  |
Demographic experience gain | $ 282 |  |
Actual return on plan assets (percent) | 10.50% | 16.50% |

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- Definition Amount of (increase) decrease in accumulated benefit obligation of defined benefit plan from effects of settlement and curtailment. + 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 (r) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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