Fair Value Measurement of Assets and Liabilities - Financial Assets and Liabilities Measured at Fair Value, Recurring (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets:
Customer accounts	$ 481	$ 69	$ 5
Debt securities	3,159
Equity investments with readily determinable fair values	4,474	2,692
Adevinta
Assets:
Equity investments with readily determinable fair values	4,474	2,692	5,391
GMarket
Assets:
Equity investments with readily determinable fair values	335	431	$ 725
Short-term investments
Assets:
Debt securities	2,556	2,521
Equity investments with readily determinable fair values	0	104
Long-term investments
Assets:
Debt securities	603	1,216
Corporate debt securities | Short-term investments
Assets:
Debt securities	2,162	2,350
Corporate debt securities | Long-term investments
Assets:
Debt securities	328	646
Government and agency securities | Short-term investments
Assets:
Debt securities	371	135
Government and agency securities | Long-term investments
Assets:
Debt securities	271	557
Fair Value, Measurements, Recurring
Assets:
Cash and cash equivalents	1,985	2,154
Customer accounts	481
Derivatives	396	336
Total financial assets	$ 10,830	$ 9,523
Derivative Asset, Statement of Financial Position, Extensible Enumeration,	Derivatives	Derivatives
Liabilities:
Other liabilities	$ 10	$ 14
Derivatives	$ 33	$ 47
Derivative Liability, Statement of Financial Position, Extensible Enumeration, Not Disclosed Flag	Derivatives	Derivatives
Fair Value, Measurements, Recurring | Adevinta
Assets:
Equity method investments	$ 4,474	$ 2,692
Fair Value, Measurements, Recurring | Short-term investments
Assets:
Restricted cash	23	36
Equity investments with readily determinable fair values		104
Total short-term investments	2,556	2,625
Fair Value, Measurements, Recurring | Long-term investments
Assets:
Restricted cash	4	13
Total long-term investments	938	1,647
Fair Value, Measurements, Recurring | Long-term investments | Equity investment under the fair value option
Assets:
Equity method investments	335	431
Fair Value, Measurements, Recurring | Corporate debt securities | Short-term investments
Assets:
Debt securities	2,162	2,350
Fair Value, Measurements, Recurring | Corporate debt securities | Long-term investments
Assets:
Debt securities	328	646
Fair Value, Measurements, Recurring | Government and agency securities | Short-term investments
Assets:
Debt securities	371	135
Fair Value, Measurements, Recurring | Government and agency securities | Long-term investments
Assets:
Debt securities	271	557
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	1,985
Customer accounts	481
Derivatives	0	0
Total financial assets	6,967	5,068
Liabilities:
Other liabilities	0	0
Derivatives	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Adevinta
Assets:
Equity method investments	4,474	2,692
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments
Assets:
Restricted cash	23	36
Equity investments with readily determinable fair values		104
Total short-term investments	23	140
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term investments
Assets:
Restricted cash	4	13
Total long-term investments	4	13
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term investments | Equity investment under the fair value option
Assets:
Equity method investments	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | Short-term investments
Assets:
Debt securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | Long-term investments
Assets:
Debt securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government and agency securities | Short-term investments
Assets:
Debt securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government and agency securities | Long-term investments
Assets:
Debt securities	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Customer accounts	0	0
Derivatives	32	122
Total financial assets	3,164	3,810
Liabilities:
Other liabilities	0	0
Derivatives	33	47
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Adevinta
Assets:
Equity method investments	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Short-term investments
Assets:
Restricted cash	0	0
Equity investments with readily determinable fair values		0
Total short-term investments	2,533	2,485
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Long-term investments
Assets:
Restricted cash	0	0
Total long-term investments	599	1,203
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Long-term investments | Equity investment under the fair value option
Assets:
Equity method investments	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Short-term investments
Assets:
Debt securities	2,162	2,350
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Long-term investments
Assets:
Debt securities	328	646
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Government and agency securities | Short-term investments
Assets:
Debt securities	371	135
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Government and agency securities | Long-term investments
Assets:
Debt securities	271	557
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
Customer accounts	0	0
Derivatives	364	214
Total financial assets	699	645
Liabilities:
Other liabilities	10	14
Derivatives	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Adevinta
Assets:
Equity method investments	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Short-term investments
Assets:
Restricted cash	0	0
Equity investments with readily determinable fair values		0
Total short-term investments	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Long-term investments
Assets:
Restricted cash	0	0
Total long-term investments	335	431
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Long-term investments | Equity investment under the fair value option
Assets:
Equity method investments	335	431
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Short-term investments
Assets:
Debt securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Long-term investments
Assets:
Debt securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Government and agency securities | Short-term investments
Assets:
Debt securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Government and agency securities | Long-term investments
Assets:
Debt securities	$ 0	$ 0