Fair Value Measurement of Assets and Liabilities - Financial Assets and Liabilities Measured at Fair Value, Recurring (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets:
Cash and cash equivalents	$ 2,130	$ 1,985
Long-term investments:
Assets:
Equity investments	376	382
Recurring
Assets:
Cash and cash equivalents	2,661	2,493
Derivatives	542	396
Total financial assets	10,536	10,830
Liabilities:
Other liabilities		10
Derivatives	7	33
Recurring | Cash and cash equivalents
Assets:
Cash and cash equivalents	2,130	1,985
Recurring | Customer accounts
Assets:
Cash and cash equivalents	448	481
Recurring | Restricted cash included in other current assets
Assets:
Cash and cash equivalents	79	23
Recurring | Restricted cash included in other assets
Assets:
Cash and cash equivalents	4	4
Recurring | Adevinta
Assets:
Equity investments	4,240	4,474
Recurring | Short-term investments:
Assets:
Investments	1,743	2,533
Recurring | Long-term investments:
Assets:
Investments	1,350	934
Recurring | Long-term investments: | Equity investment under the fair value option
Assets:
Investments	329	335
Recurring | Corporate debt securities | Short-term investments:
Assets:
Investments	1,270	2,162
Recurring | Corporate debt securities | Long-term investments:
Assets:
Investments	575	328
Recurring | Government and agency securities | Short-term investments:
Assets:
Investments	473	371
Recurring | Government and agency securities | Long-term investments:
Assets:
Investments	446	271
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	2,661	2,493
Derivatives	0	0
Total financial assets	6,901	6,967
Liabilities:
Other liabilities		0
Derivatives	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents
Assets:
Cash and cash equivalents	2,130	1,985
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Customer accounts
Assets:
Cash and cash equivalents	448	481
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted cash included in other current assets
Assets:
Cash and cash equivalents	79	23
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted cash included in other assets
Assets:
Cash and cash equivalents	4	4
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Adevinta
Assets:
Equity investments	4,240	4,474
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments:
Assets:
Investments	0	0
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) | 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 | Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Derivatives	29	32
Total financial assets	2,793	3,164
Liabilities:
Other liabilities		0
Derivatives	7	33
Recurring | Significant Other Observable Inputs (Level 2) | Cash and cash equivalents
Assets:
Cash and cash equivalents	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Customer accounts
Assets:
Cash and cash equivalents	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Restricted cash included in other current assets
Assets:
Cash and cash equivalents	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Restricted cash included in other assets
Assets:
Cash and cash equivalents	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Adevinta
Assets:
Equity investments	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Short-term investments:
Assets:
Investments	1,743	2,533
Recurring | Significant Other Observable Inputs (Level 2) | Long-term investments:
Assets:
Investments	1,021	599
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) | Corporate debt securities | Short-term investments:
Assets:
Investments	1,270	2,162
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Long-term investments:
Assets:
Investments	575	328
Recurring | Significant Other Observable Inputs (Level 2) | Government and agency securities | Short-term investments:
Assets:
Investments	473	371
Recurring | Significant Other Observable Inputs (Level 2) | Government and agency securities | Long-term investments:
Assets:
Investments	446	271
Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
Derivatives	513	364
Total financial assets	842	699
Liabilities:
Other liabilities		10
Derivatives	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Cash and cash equivalents
Assets:
Cash and cash equivalents	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Customer accounts
Assets:
Cash and cash equivalents	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Restricted cash included in other current assets
Assets:
Cash and cash equivalents	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Restricted cash included in other assets
Assets:
Cash and cash equivalents	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Adevinta
Assets:
Equity investments	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	329	335
Recurring | Significant Unobservable Inputs (Level 3) | Long-term investments: | Equity investment under the fair value option
Assets:
Investments	329	335
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