Fair Value Measurement of Assets and Liabilities - Financial Assets and Liabilities Measured at Fair Value, Recurring (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets:
Equity investment	$ 3,748	$ 5,391
Adevinta
Assets:
Equity investment	3,748	5,391
Long-term Investments
Assets:
Equity investment	543	725
Recurring
Assets:
Cash and cash equivalents	1,798	1,379
Derivatives	465	553
Total financial assets	11,879	15,719
Liabilities:
Derivatives	18	17
Recurring | Adevinta
Assets:
Equity investment	3,748	5,391
Recurring | Short-term investments
Assets:
Investments	3,771	5,944
Recurring | Long-term Investments
Assets:
Investments	2,097	2,452
Recurring | Long-term Investments | Equity investment under the fair value option
Assets:
Investments	543	725
Recurring | Restricted cash | Short-term investments
Assets:
Investments	20	22
Recurring | Corporate debt securities | Short-term investments
Assets:
Investments	2,907	4,152
Recurring | Corporate debt securities | Long-term Investments
Assets:
Investments	784	950
Recurring | Government and agency securities | Short-term investments
Assets:
Investments	40	25
Recurring | Government and agency securities | Long-term Investments
Assets:
Investments	770	777
Recurring | Equity investments with readily determinable fair values | Short-term investments
Assets:
Investments	804	1,745
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	1,798	1,379
Derivatives	0	0
Total financial assets	6,370	8,537
Liabilities:
Derivatives	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Adevinta
Assets:
Equity investment	3,748	5,391
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments
Assets:
Investments	824	1,767
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term Investments
Assets:
Investments	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term Investments | Equity investment under the fair value option
Assets:
Investments	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted cash | Short-term investments
Assets:
Investments	20	22
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | Short-term investments
Assets:
Investments	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | Long-term Investments
Assets:
Investments	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government and agency securities | Short-term investments
Assets:
Investments	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government and agency securities | Long-term Investments
Assets:
Investments	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity investments with readily determinable fair values | Short-term investments
Assets:
Investments	804	1,745
Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Derivatives	136	109
Total financial assets	4,637	6,013
Liabilities:
Derivatives	18	17
Recurring | Significant Other Observable Inputs (Level 2) | Adevinta
Assets:
Equity investment	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Short-term investments
Assets:
Investments	2,947	4,177
Recurring | Significant Other Observable Inputs (Level 2) | Long-term Investments
Assets:
Investments	1,554	1,727
Recurring | Significant Other Observable Inputs (Level 2) | Long-term Investments | Equity investment under the fair value option
Assets:
Investments	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Restricted cash | Short-term investments
Assets:
Investments	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Short-term investments
Assets:
Investments	2,907	4,152
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Long-term Investments
Assets:
Investments	784	950
Recurring | Significant Other Observable Inputs (Level 2) | Government and agency securities | Short-term investments
Assets:
Investments	40	25
Recurring | Significant Other Observable Inputs (Level 2) | Government and agency securities | Long-term Investments
Assets:
Investments	770	777
Recurring | Significant Other Observable Inputs (Level 2) | Equity investments with readily determinable fair values | Short-term investments
Assets:
Investments	0	0
Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
Derivatives	329	444
Total financial assets	872	1,169
Liabilities:
Derivatives	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Adevinta
Assets:
Equity investment	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Short-term investments
Assets:
Investments	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Long-term Investments
Assets:
Investments	543	725
Recurring | Significant Unobservable Inputs (Level 3) | Long-term Investments | Equity investment under the fair value option
Assets:
Investments	543	725
Recurring | Significant Unobservable Inputs (Level 3) | Restricted cash | Short-term investments
Assets:
Investments	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Short-term investments
Assets:
Investments	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Long-term Investments
Assets:
Investments	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Government and agency securities | Short-term investments
Assets:
Investments	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Government and agency securities | Long-term Investments
Assets:
Investments	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Equity investments with readily determinable fair values | Short-term investments
Assets:
Investments	$ 0	$ 0