Investments - Equity Investments (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Equity investment	$ 3,748	$ 5,391
Equity investments without readily determinable fair values	78	85	$ 528	$ 539
Total equity investments	5,211	7,984
Adevinta
Schedule of Investments [Line Items]
Equity investment	3,748	5,391
Short-term investments:
Schedule of Investments [Line Items]
Equity investments with readily determinable fair values	804	1,745
Long-term investments:
Schedule of Investments [Line Items]
Equity investment	543	725
Equity investments under the equity method of accounting	38	38
Equity investments without readily determinable fair values	$ 78	$ 85