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INVESTMENTS - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale and maturity of investments |  |  |  |  |  | $ 8 | $ 2,997 |  |  |  |
Impairment of investment | [1] |  | $ 0 | $ 0 |  | 0 | 100 |  |  |  |
Government and corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales and maturities of investments |  |  |  |  |  |  | 2,200 |  |  |  |
Trip.com Group |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of investment in equity securities with readily determinable fair values |  |  |  | 655 |  |  | 655 |  |  |  |
Proceeds from sale and maturity of investments |  |  |  |  |  |  | 525 |  |  |  |
Net realized loss on securities |  |  |  |  |  |  | 201 |  |  |  |
Trip.com Group | Convertible Debt Securities |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortized cost of available-for-sale debt securities |  |  | 525 |  |  | 525 |  |  |  |  |
Meituan |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire other investments |  |  |  |  |  |  |  |  | $ 450 |  |
Unrealized (losses) gains on equity securities held |  |  | $ (772) | $ 727 |  | $ (509) | $ 1,400 |  |  |  |
DiDi Global Inc. |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire other investments |  |  |  |  |  |  |  | $ 500 |  |  |
ADSs representing Class A ordinary share, ratio |  |  | 0.25 |  |  | 0.25 |  |  |  |  |
Unrealized loss on securities held |  |  | $ 249 |  |  | $ 94 |  |  |  |  |
Yanolja | Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount |  | $ 250 |  |  |  |  |  |  |  |  |
Long-term Investments | Investment in private company equity securities |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of investment without readily determinable fair values |  |  | 66 |  |  | 66 |  |  |  |  | $ 552
Investment in equity securities without readily determinable FV |  |  | 69 |  |  | 69 |  |  |  |  | 455
Long-term Investments | Trip.com Group | Convertible Debt Securities |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortized cost of available-for-sale debt securities |  |  |  |  |  |  |  |  |  |  | 25
Estimated fair value |  |  |  |  |  |  |  |  |  |  | 24
Long-term Investments | Meituan |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  | 2,600 |  |  | 2,600 |  |  |  |  | 3,100
Long-term Investments | DiDi Global Inc. |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  | 306 |  |  | 306 |  |  |  |  |
Long-term Investments | DiDi Global Inc. | Investment in private company equity securities |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of investment |  |  |  |  | $ 100 |  |  |  |  |  |
Investment in equity securities without readily determinable FV |  |  |  |  | $ 400 |  |  |  |  | $ 400 | 400
Long-term Investments | Yanolja | Investment in private company equity securities |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of investment without readily determinable fair values |  |  | 51 |  |  | 51 |  |  |  |  | 51
Long-term Investments | Grab | Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortized cost of available-for-sale debt securities |  |  | 200 |  |  | 200 |  |  |  |  | 200
Estimated fair value |  |  | 330 |  |  | 330 |  |  |  |  | 200
Short-term Investments | Trip.com Group | Convertible Debt Securities |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortized cost of available-for-sale debt securities |  |  | 525 |  |  | 525 |  |  |  |  | 500
Estimated fair value |  |  | 522 |  |  | 522 |  |  |  |  | 501
Short-term Investments | Trip.com Group, Convertible Senior Notes, Issued September 2016 | Convertible Debt Securities |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortized cost of available-for-sale debt securities |  |  | $ 25 |  |  | $ 25 |  |  |  |  |
Term of available-for-sale debt securities |  |  | 6 years |  |  | 6 years |  |  |  |  |
Short-term Investments | Trip.com Group, Convertible Senior Notes, Issued December 2015 | Convertible Debt Securities |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortized cost of available-for-sale debt securities |  |  | $ 500 |  |  | $ 500 |  |  |  |  | $ 500
Term of available-for-sale debt securities |  |  | 10 years |  |  | 10 years |  |  |  |  |
[1] | See Note 5 for additional information related to the net (losses) gains on equity securities and impairment of investment.

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