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Pension and Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2024 | Sep. 30, 2024 | Apr. 01, 2024
Benefit Plan Information |  |  |  |  |
Discontinued operation, pension plan benefit obligation |  |  |  |  | $ 2,700
Discontinued operation, postretirement plan benefit obligation |  |  |  |  | $ 2,400
Settlements, curtailments, special termination benefits and other | $ 795 |  |  | $ 795 |
Impact of remeasurement |  | $ 70 | $ 220 |  |
U.S. Pension Plans |  |  |  |  |
Benefit Plan Information |  |  |  |  |
Company contributions |  |  |  | 108 |
Pension payment obligations transferred | $ 2,500 |  |  |  |
U.S. Pension Plans | United States |  |  |  |  |
Benefit Plan Information |  |  |  |  |
Discount rate | 5.43% | 5.22% | 5.43% |  |
Percentage increase (decrease) in discount rate obligation from the prior year |  | 24.00% |  |  |
U.S. Pension Plans | Minimum |  |  |  |  |
Benefit Plan Information |  |  |  |  |
Estimated pension contributions for current fiscal year |  |  |  | 100 |
U.S. Pension Plans | Maximum |  |  |  |  |
Benefit Plan Information |  |  |  |  |
Estimated pension contributions for current fiscal year |  |  |  | 200 |
Postretirement Benefits |  |  |  |  |
Benefit Plan Information |  |  |  |  |
Company contributions |  |  |  | $ 8 |
Discount rate |  | 5.19% |  |  |
Percentage increase (decrease) in discount rate obligation from the prior year |  | 25.00% |  |  |

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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 -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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