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Summary Of Significant Accounting Policies (Taxation&Net Income/(Loss) per Share&Short-term Investments) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 17, 2020 | Dec. 31, 2017 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Withholding tax rate on dividends, foreign invested enterprises to foreign holding companies |  |  | 10.00% |  |  |  |
Statutory income tax rate |  |  | 25.00% | 25.00% | 25.00% |  |
Class A ordinary shares [Member] | Changyou [Member] | Changyou Merger [Member] |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Consideration Per Share | $ 5.40 |  |  |  |  |  |
Class A ordinary shares [Member] | Share Options [Member] | Changyou [Member] | Changyou Merger [Member] |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Exercise Price of Shares | 0.01 |  |  |  |  |  |
Changyou 2014 and 2019 Share Incentive Plan [Member] | Class A ordinary shares [Member] | Share Options [Member] | Changyou [Member] | Changyou Merger [Member] |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Share-based compensation by share based payment arrangement per share weighted average price per share | 5.39 |  |  |  |  |  |
Accrued fixed price, initial | 5.39 |  |  |  |  |  |
Accrued fixed price, final | 5.39 |  |  |  |  |  |
Changyou 2014 Share Incentive Plan [Member] | Class A ordinary shares [Member] | Share Options [Member] | Changyou [Member] | Changyou Merger [Member] |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Weighted Average Exercise Price, Exercised | 5.39 |  |  |  |  |  |
Consideration Per Share | 5.40 |  |  |  |  |  |
Exercise Price of Shares | 0.01 |  |  |  |  |  |
Share-based compensation by share based payment arrangement per share weighted average price per share | 5.39 |  |  |  |  |  |
Accrued fixed price, initial | 5.39 |  |  |  |  |  |
Accrued fixed price, final | $ 5.39 |  |  |  |  |  |
Sohu [Member] | Ordinary Shares [Member] | Changyou [Member] | Changyou Merger [Member] |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Effective Interest held | 100.00% |  |  |  |  |  |
Minimum [Member] | Time Deposit [Member] |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Restricted Investment Maturity Period |  |  | 3 months |  |  |  |
Minimum [Member] | Long Term Time Deposit [Member] |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Restricted Investment Maturity Period |  |  | 1 year |  |  |  |
Maximum [Member] | Time Deposit [Member] |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Restricted Investment Maturity Period |  |  | 1 year |  |  |  |
Thereafter tax years after December 31,2017 [Member] |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Statutory income tax rate |  |  |  |  |  | 21.00% |
Prior tax years before December 31,2017 [Member] |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Statutory income tax rate |  |  |  |  |  |  | 35.00%
HONG KONG |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Preferential withholding tax rate on dividends, foreign invested enterprises |  |  | 5.00% |  |  |  |
UNITED STATES |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Provisional amount of income tax expense recognized for the Toll Charge |  | $ 219 |  |  |  |  |
Reduction in liability for deferred income tax |  | $ 4 |  |  |  |  |
Unrecognized tax benefit recorded |  |  |  |  |  | $ 142 |
Interest in connection with unrecognized tax benefit |  |  | $ 5 | $ 6 |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  |  |  |  |  | $ 77 |
UNITED STATES | Thereafter tax years after December 31,2017 [Member] |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Statutory income tax rate |  |  |  |  |  | 21.00% |
UNITED STATES | Prior tax years before December 31,2017 [Member] |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Statutory income tax rate |  |  |  |  |  |  | 35.00%
CHINA |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Withholding tax rate on dividends, foreign invested enterprises to foreign holding companies |  |  | 10.00% |  |  |  |
State Administration of Taxation, China [Member] |  |  |  |  |  |  |
Taxation&Net Income/(Loss) per Share&Short-term Investments[Line Items] |  |  |  |  |  |  |
Value-added tax rate |  |  | 6.00% |  |  |  |
Statutory income tax rate |  |  | 25.00% |  |  |  |

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