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Employee Postretirement Benefits (Principal Plans and All Other Pension Plans) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Principal Plans |  |  |
Projected benefit obligation (PBO) | $ 2,089 | $ 3,339 |
Accumulated benefit obligation (ABO) | 2,089 | 3,339 |
Fair value of plan assets | 2,018 | 3,389 |
All Other Pension Plans |  |  |
Projected benefit obligation (PBO) | 352 | 472 |
Accumulated benefit obligation (ABO) | 305 | 408 |
Fair value of plan assets | 303 | 355 |
Defined Benefit Pension Plans |  |  |
Projected benefit obligation (PBO) | 2,441 | 3,811 | $ 4,341
Accumulated benefit obligation (ABO) | 2,394 | 3,747 |
Fair value of plan assets | $ 2,321 | $ 3,744 | $ 4,193

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for 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 (a) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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