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Postretirement Benefit Plans - Additional Information (Detail) retiree in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) retiree | Dec. 31, 2018 USD ($) contract retiree | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) retiree | Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of insurance contracts purchased | contract |  | 2 |  |  |
Number of retirees | retiree |  |  |  | 32 |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | $ 37,331 | $ 33,646 | $ 37,331 | $ 33,646 |
Aggregate liability for postemployment plans | 42 | 46 | 42 | 46 |
Actuarial losses and net prior service cost related to postretirement benefit plans expected to be recognized in net periodic benefit cost during 2020 | 559 |  | 559 |  |
Actuarial losses and net prior service cost related to postretirement benefit plans expected to be recognized in net periodic benefit cost during 2020, net of tax |  |  | 441 |  |
Expected pension plan expenses during next fiscal year | (115) |  | (115) |  |
Nonqualified Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit pension plan, liabilities | 1,400 | 1,200 | 1,400 | 1,200 |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | 657 | 425 | 657 | 425 |
Unrecognized net actuarial losses | 641 | 505 | 641 | 505 |
Unrecognized prior service credit |  |  | 34 | 48 |
Benefit plan expense |  |  | 108 | 123 | $ 126
Qualified Defined Benefit Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated benefit obligation for defined benefit pension plans | 48,600 | 43,300 | 48,600 | 43,300 |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | 35,442 | 32,002 | 35,442 | 32,002 | 33,095
Unrecognized net actuarial losses | 20,609 | 19,117 | 20,609 | 19,117 |
Actuarial losses related to postretirement benefit plans expected to be recognized in net periodic benefit cost during 2020 | 507 |  | 507 |  |
Actuarial losses related to postretirement benefit plans expected to be recognized in net periodic benefit cost during 2020, net of tax |  |  | 399 |  |
Increase (decrease) in projected benefit obligations due to a change in discount rate |  |  | 5,800 | 3,500 |
Company contributions |  |  | 1,000 | 5,000 |
Changes in longevity assumptions |  |  | 860 | (162) |
Actual return on plan assets |  |  | $ 6,667 | (1,893) |
Actual return on plan assets (percent) |  |  | 21.00% |  |
Expected return on plan assets |  |  | $ 2,300 | $ 2,395 | $ 2,249
Expected long-term rate of return on assets |  |  | 7.00% | 7.00% | 7.50%
Hedge funds | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period |  |  | 1 month |  |
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 |  |
Private equity funds | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period |  |  | 8 years |  |
Private equity funds | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period |  |  | 12 years |  |
Real estate funds | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period |  |  | 8 years |  |
Real estate funds | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period |  |  | 10 years |  |
Irrevocable Group Annuity Contract |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Cash payment for contract | 1,900 | $ 2,600 |  |  |
Difference between insurance payment and pension obligations funded recognized in other comprehensive loss | $ 45 |  |  |  |
Irrevocable Group Annuity Contract | Qualified Defined Benefit Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of retirees | retiree | 20 | 32 |  |  |
Reimbursable future benefit payments | $ 1,900 |  |  |  |
Buy-In Contract | Qualified Defined Benefit Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of retirees | retiree |  | 9 |  | 9 |

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