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Employee Postretirement Benefits (Principal Plans and All Other Pension Plans) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Principal Plans |  |  |
Projected benefit obligation (PBO) | $ 3,339 | $ 3,629 |
Accumulated benefit obligation (ABO) | 3,339 | 3,629 |
Fair value of plan assets | 3,389 | 3,627 |
All Other Pension Plans |  |  |
Projected benefit obligation (PBO) | 472 | 712 |
Accumulated benefit obligation (ABO) | 408 | 619 |
Fair value of plan assets | 355 | 566 |
Defined Benefit Pension Plans |  |  |
Projected benefit obligation (PBO) | 3,811 | 4,341 | $ 4,047
Accumulated benefit obligation (ABO) | 3,747 | 4,248 |
Fair value of plan assets | $ 3,744 | $ 4,193 | $ 3,803

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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 http://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 http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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