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Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain) | $ 3,566 | $ 3,613
Prior service cost (benefit) | 0 | 18
Total accumulated other comprehensive loss (income), pre-tax | 3,566 | 3,631
Retiree Medical and Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain) | (383) | (505)
Prior service cost (benefit) | 197 | (148)
Total accumulated other comprehensive loss (income), pre-tax | (186) | (653)
American Airlines, Inc. | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain) | 3,561 | 3,609
Prior service cost (benefit) | 0 | 18
Total accumulated other comprehensive loss (income), pre-tax | 3,561 | 3,627
American Airlines, Inc. | Retiree Medical and Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain) | (382) | (505)
Prior service cost (benefit) | 197 | (148)
Total accumulated other comprehensive loss (income), pre-tax | $ (185) | $ (653)

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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