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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2021 | Apr. 30, 2020
Accounting Policies [Line Items] |  |  |  |
Prior Period Reclassification Adjustment |  | $ 106 |  |
Retained earnings | $ 36,525 | 31,830 |  |
Long-term debt | 14,853 | 12,223 |  |
Additional paid-in capital | (7,707) | (7,175) |  |
Deferred income taxes | $ (289) | $ (258) |  |
Online Travel Reservation Services |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Time period from the reservation date that performance obligations are expected to be completed | one year |  |  |
0.75% Convertible Senior Notes due May 2025 (2)(3) |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Stated interest rate | 0.75% |  |  |
Accounting Standards Update 2020-06 |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Retained earnings |  |  | $ 30 |
Long-term debt |  |  | 86 |
Additional paid-in capital |  |  | 96 |
Deferred income taxes |  |  | $ 21 |
Convertible Senior Notes | 0.75% Convertible Senior Notes due May 2025 (2)(3) |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Stated interest rate |  |  | 0.75% | 0.75%

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