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Postretirement Plans - Schedule of Changes in the Benefit Obligation, Plan Assets and Funded Status of Pensions and OPB (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2020 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Company contribution | $ 3,000 |  |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Accrued pension plan liability, net |  | $ (6,516) | $ (6,141) |
Pension |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Beginning balance |  | 55,117 | 75,635 |
Service cost |  | 2 | 3 | $ 3
Interest cost |  | 2,820 | 2,080 | 1,988
Amendments |  |  | 1 |
Actuarial loss/(gain) |  | 1,217 | (17,605) |
Gross benefits paid |  | (4,837) | (4,971) |
Subsidies |  |  |  |
Exchange rate adjustment |  | 6 | (26) |
Ending balance |  | 54,325 | 55,117 | 75,635
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Beginning balance at fair value |  | 49,825 | 67,813 |
Actual return on plan assets |  | 3,756 | (13,141) |
Company contribution |  |  | 2 |
Plan participants' contributions |  |  |  |
Benefits paid |  | (4,698) | (4,824) |
Exchange rate adjustment |  | 8 | (25) |
Ending balance at fair value |  | 48,891 | 49,825 | 67,813
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Other assets |  | 1,219 | 987 |
Accrued liabilities |  | (137) | (138) |
Accrued retiree health care |  |  |  |
Accrued pension plan liability, net |  | (6,516) | (6,141) |
Net amount recognized |  | (5,434) | (5,292) |
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Beginning balance |  | 2,978 | 4,092 |
Service cost |  | 49 | 72 | 87
Interest cost |  | 148 | 98 | 97
Amendments |  |  |  |
Actuarial loss/(gain) |  | (152) | (914) |
Gross benefits paid |  | (375) | (406) |
Subsidies |  | 2 | 39 |
Exchange rate adjustment |  | 1 | (3) |
Ending balance |  | 2,651 | 2,978 | 4,092
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Beginning balance at fair value |  | 140 | 172 |
Actual return on plan assets |  | 23 | (27) |
Company contribution |  |  |  |
Plan participants' contributions |  | 4 | 6 |
Benefits paid |  | (4) | (11) |
Exchange rate adjustment |  |  |  |
Ending balance at fair value |  | 163 | 140 | $ 172
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Other assets |  | 81 | 21 |
Accrued liabilities |  | (336) | (356) |
Accrued retiree health care |  | (2,233) | (2,503) |
Accrued pension plan liability, net |  |  |  |
Net amount recognized |  | $ (2,488) | $ (2,838) |

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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/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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