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Postretirement Plans - Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets (Details) - Pension - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value | $ 49,825 | $ 67,813
Net Realized and Unrealized Gains/(Losses) | 3,756 | (13,141)
Ending balance at fair value | 48,891 | 49,825
Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value | 268 | 198
Net Realized and Unrealized Gains/(Losses) | 14 | (90)
Net Purchases, Issuances and Settlements | (12) | 31
Net Transfers Into/(Out of) Level 3 | (44) | 129
Ending balance at fair value | 226 | 268
U.S. government and agencies | Level 3 | Fixed income |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value |  |
Ending balance at fair value |  |
Fixed income | Corporate |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value | 15,095 |
Ending balance at fair value | 17,809 | 15,095
Fixed income | Corporate | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value | 70 | 53
Net Realized and Unrealized Gains/(Losses) | 5 | (19)
Net Purchases, Issuances and Settlements | (16) | 3
Net Transfers Into/(Out of) Level 3 |  | 33
Ending balance at fair value | 59 | 70
Fixed income | U.S. government and agencies |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value | 7,827 |
Ending balance at fair value | 6,822 | 7,827
Fixed income | U.S. government and agencies | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Net Realized and Unrealized Gains/(Losses) |  |
Net Purchases, Issuances and Settlements | (1) |
Net Transfers Into/(Out of) Level 3 | 1 |
Fixed income | Mortgage backed and asset backed |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value | 664 |
Ending balance at fair value | 505 | 664
Fixed income | Mortgage backed and asset backed | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value | 162 | 102
Net Realized and Unrealized Gains/(Losses) | 7 | (11)
Net Purchases, Issuances and Settlements | 10 | 16
Net Transfers Into/(Out of) Level 3 | (18) | 55
Ending balance at fair value | 161 | 162
Fixed income | Municipal |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value | 843 |
Ending balance at fair value | 816 | 843
Fixed income | Municipal | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value | 32 | 29
Net Realized and Unrealized Gains/(Losses) |  | (14)
Net Purchases, Issuances and Settlements | (5) | 9
Net Transfers Into/(Out of) Level 3 | (27) | 8
Ending balance at fair value |  | 32
Fixed income | Other | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value |  |
Net Realized and Unrealized Gains/(Losses) | 3 |
Net Purchases, Issuances and Settlements |  |
Net Transfers Into/(Out of) Level 3 |  |
Ending balance at fair value | 3 |
Fixed income | Sovereign |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value | 706 |
Ending balance at fair value | 720 | 706
Fixed income | Sovereign | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value |  | 9
Net Realized and Unrealized Gains/(Losses) |  |
Net Purchases, Issuances and Settlements |  |
Net Transfers Into/(Out of) Level 3 |  | (9)
Ending balance at fair value |  |
Global equity | Non-U.S. common and preferred stock |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value | 2,023 |
Ending balance at fair value | 2,204 | 2,023
Global equity | Non-U.S. common and preferred stock | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value |  | 5
Net Realized and Unrealized Gains/(Losses) |  | (45)
Net Purchases, Issuances and Settlements |  | (2)
Net Transfers Into/(Out of) Level 3 |  | 42
Ending balance at fair value |  |
Real estate and real assets | Real assets | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Beginning balance at fair value | 4 |
Net Realized and Unrealized Gains/(Losses) | (1) | (1)
Net Purchases, Issuances and Settlements |  | 5
Net Transfers Into/(Out of) Level 3 |  |
Ending balance at fair value | $ 3 | $ 4

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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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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment. + 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 (d)(iv)(02)(B) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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