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EMPLOYEE BENEFIT PLANS - Benefit Plan Assets Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Benefit plan assets by asset class |  |
Benefit plan assets | $ 16,166 | $ 15,641
Level 1 and Level 2 |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 4,749 | 3,312
Level 1 and Level 2 | Fixed income and fixed income-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 2,158 | 1,443
Level 1 and Level 2 | Cash equivalents |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 1,156 | 894
Level 1 and Level 2 | Equities and equity-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 769 | 445
Level 1 and Level 2 | Delta common stock |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 419 | 343
Level 1 and Level 2 | Real assets |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 247 | 187
Level 1 |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 1,848 | 1,486
Level 1 | Fixed income and fixed income-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 300 | 77
Level 1 | Cash equivalents |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 471 | 629
Level 1 | Equities and equity-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 647 | 420
Level 1 | Delta common stock |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 419 | 343
Level 1 | Real assets |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 11 | 17
Level 2 |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 2,901 | 1,826
Level 2 | Fixed income and fixed income-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 1,858 | 1,366
Level 2 | Cash equivalents |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 685 | 265
Level 2 | Equities and equity-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 122 | 25
Level 2 | Delta common stock |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 0 | 0
Level 2 | Real assets |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 236 | 170
NAV |  |
Benefit plan assets by asset class |  |
Benefit plan assets | $ 11,417 | $ 12,329

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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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