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Discount Rate On 30-Day Volume Weighted Average Price

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Voting Interest, Percentage

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Investments - Narrative (Details) $ / shares in Units, shares in Millions		3 Months Ended			9 Months Ended
	Jul. 14, 2021 USD ($) $ / shares shares	Dec. 31, 2021	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jul. 12, 2021	Jun. 24, 2021 USD ($)	Dec. 31, 2020 USD ($)
Investments [Abstract]
Investment securities in a continuous unrealized loss position for less then 12 months			$ 1,100,000,000		$ 1,100,000,000				$ 261,000,000
Estimated fair value for securities in continuous unrealized loss position for greater than 12 months			0		0				0
Schedule of Equity Method Investments [Line Items]
Unrealized gain on equity securities			(573,000,000)	$ 0	(953,000,000)	$ (40,000,000)
Realized gain on equity securities			83,000,000	$ 0	83,000,000	0
Equity investment			9,279,000,000		9,279,000,000				0
Adevinta
Schedule of Equity Method Investments [Line Items]
Equity investment			$ 9,279,000,000		$ 9,279,000,000				$ 0
Ownership percentage			44.00%		44.00%			44.00%
Value of equity method investment at acquisition date								$ 10,800,000,000
Voting rights, conversion ratio								1
Change in fair value of equity investment in Adevinta			$ 1,075,000,000		$ 1,497,000,000	$ 0
Discount rate on 10-day VWAP							7.00%
Discount rate on 30-day VWAP							5.00%
Adevinta \| Forecast
Schedule of Equity Method Investments [Line Items]
Ownership percentage after sale		33.00%
Adevinta \| Permira
Schedule of Equity Method Investments [Line Items]
Total consideration in sale of equity investment	$ 2,250,000,000
Number of shares in equity investment \| shares	125
Purchase price per share (in usd per share) \| $ / shares	$ 18.02
Sale of equity investment, option period	30 days
Number of additional shares in option to purchase \| shares	10
Additional consideration in option to purchase	$ 180,000,000
Adevinta \| Maximum
Schedule of Equity Method Investments [Line Items]
Limitation on voting interest that can be held (as a percent)								33.00%
KakaoBank
Schedule of Equity Method Investments [Line Items]
Unrealized gain on equity securities			512,000,000		512,000,000
Realized gain on equity securities			83,000,000		83,000,000
Total consideration in sale of equity investment			114,000,000		114,000,000
Equity investment			$ 793,000,000		$ 793,000,000