Fair Value Measurement of Assets and Liabilities - Financial Assets and Liabilities Measured at Fair Value, Recurring (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Assets:
Cash and cash equivalents	$ 2,268	$ 2,154
Customer accounts	380	69
Adevinta
Assets:
Equity investment in Adevinta	2,656	2,692
Long-term investments:
Assets:
Equity investment in Adevinta	431	461
Recurring
Assets:
Derivatives	352	336
Total financial assets	9,199	9,523
Liabilities:
Other liabilities	24	14
Derivatives	30	47
Recurring | Adevinta
Assets:
Equity investment in Adevinta	2,656	2,692
Recurring | Short-term investments:
Assets:
Investments	2,208	2,625
Recurring | Long-term investments:
Assets:
Investments	1,335	1,647
Recurring | Long-term investments: | Equity investment under the fair value option
Assets:
Investments	391	431
Recurring | Restricted cash | Short-term investments:
Assets:
Investments	22	36
Recurring | Restricted cash | Long-term investments:
Assets:
Investments	4	13
Recurring | Corporate debt securities | Short-term investments:
Assets:
Investments	1,936	2,350
Recurring | Corporate debt securities | Long-term investments:
Assets:
Investments	378	646
Recurring | Government and agency securities | Short-term investments:
Assets:
Investments	153	135
Recurring | Government and agency securities | Long-term investments:
Assets:
Investments	562	557
Recurring | Equity investments with readily determinable fair values | Short-term investments:
Assets:
Investments	97	104
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivatives	0	0
Total financial assets	5,427	5,068
Liabilities:
Other liabilities	0	0
Derivatives	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Adevinta
Assets:
Equity investment in Adevinta	2,656	2,692
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments:
Assets:
Investments	119	140
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term investments:
Assets:
Investments	4	13
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	22	36
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted cash | Long-term investments:
Assets:
Investments	4	13
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	97	104
Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Customer accounts	0	0
Derivatives	69	122
Total financial assets	3,098	3,810
Liabilities:
Other liabilities	0	0
Derivatives	30	47
Recurring | Significant Other Observable Inputs (Level 2) | Adevinta
Assets:
Equity investment in Adevinta	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Short-term investments:
Assets:
Investments	2,089	2,485
Recurring | Significant Other Observable Inputs (Level 2) | Long-term investments:
Assets:
Investments	940	1,203
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) | Restricted cash | Long-term investments:
Assets:
Investments	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Short-term investments:
Assets:
Investments	1,936	2,350
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Long-term investments:
Assets:
Investments	378	646
Recurring | Significant Other Observable Inputs (Level 2) | Government and agency securities | Short-term investments:
Assets:
Investments	153	135
Recurring | Significant Other Observable Inputs (Level 2) | Government and agency securities | Long-term investments:
Assets:
Investments	562	557
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
Customer accounts	0	0
Derivatives	283	214
Total financial assets	674	645
Liabilities:
Other liabilities	24	14
Derivatives	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Adevinta
Assets:
Equity investment in Adevinta	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	391	431
Recurring | Significant Unobservable Inputs (Level 3) | Long-term investments: | Equity investment under the fair value option
Assets:
Investments	391	431
Recurring | Significant Unobservable Inputs (Level 3) | Restricted cash | Short-term investments:
Assets:
Investments	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Restricted cash | Long-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