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Pensions And Other Postretirement Benefits - Components of Expense and Assumptions (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Other Postretirement Benefits Plan |  |  |  |
Components of expense |  |  |  |
Service cost |  | $ 16 | $ 18 | $ 19
Interest cost |  | 148 | 123 | 173
Expected return on plan assets |  | 0 | 0 | 0
Amortization of net actuarial losses |  | 67 | 97 | 74
Curtailments, settlements and other |  | (5) | (6) | (8)
Net periodic pension and OPEB (income) expense |  | $ 226 | $ 232 | $ 258
Weighted-average assumptions used to determine benefit obligations(a) |  |  |  |
Discount rate | 2.53% | 5.51% | 2.97% | 2.53%
Weighted-average assumptions used to determine net expense(a) |  |  |  |
Discount rate |  | 2.84% | 2.24% | 3.00%
U.S. | Pension Plan |  |  |  |
Components of expense |  |  |  |
Service cost |  | $ 233 | $ 260 | $ 251
Service cost |  | 161 | 187 |
Interest cost |  | 1,292 | 1,074 | 1,716
Expected return on plan assets |  | (3,000) | (3,178) | (3,267)
Amortization of net actuarial losses |  | 18 | 26 | 16
Curtailments, settlements and other |  | (17) | 15 | 17
Net periodic pension and OPEB (income) expense |  | $ (1,474) | $ (1,803) | $ (1,267)
Weighted-average assumptions used to determine benefit obligations(a) |  |  |  |
Discount rate | 2.37% | 5.47% | 2.78% | 2.37%
Weighted-average assumptions used to determine net expense(a) |  |  |  |
Discount rate |  | 2.34% | 1.86% | 2.84%
Expected rate of return on plan assets |  | 5.38% | 5.63% | 5.88%
U.S. | Pension Plan | Plan |  |  |  |
Weighted-average assumptions used to determine net expense(a) |  |  |  |
Expected rate of return on plan assets |  | 6.30% | 5.40% |
Non-U.S. | Pension Plan |  |  |  |
Components of expense |  |  |  |
Service cost |  | $ 157 | $ 121 | $ 145
Service cost |  | 146 | 109 |
Interest cost |  | 293 | 236 | 362
Expected return on plan assets |  | (534) | (610) | (675)
Amortization of net actuarial losses |  | 133 | 212 | 171
Curtailments, settlements and other |  | 10 | 7 | 241
Net periodic pension and OPEB (income) expense |  | $ 59 | $ (34) | $ 244
Weighted-average assumptions used to determine benefit obligations(a) |  |  |  |
Discount rate | 1.62% | 4.85% | 2.13% | 1.62%
Weighted-average assumptions used to determine net expense(a) |  |  |  |
Discount rate |  | 2.98% | 2.38% | 2.80%
Expected rate of return on plan assets |  | 4.39% | 4.67% | 4.96%
Canada | Pension Plan |  |  |  |
Weighted-average assumptions used to determine net expense(a) |  |  |  |
Payment for annuity purchase | $ 1,500 |  |  |
Non-operating pension settlement charge | $ 130 |  |  |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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