Investments - Summarized Financial Information of Investment in Adevinta (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement
Gross profit	$ 1,919	$ 1,823	$ 1,996	$ 2,032	$ 1,930	$ 1,780	$ 1,920	$ 1,467	$ 7,770	$ 7,097	$ 5,844
Income (loss) from continuing operations	(893)	283	294	568	772	605	689	421	252	2,487	1,433
Net income	1,969	264	$ 10,734	$ 641	845	$ 664	$ 746	$ 3,412	13,608	5,667	$ 1,786
Assets
Current assets	9,111				7,190				9,111	7,190
Liabilities and Equity
Current liabilities	$ 4,622				$ 4,002				$ 4,622	$ 4,002
Adevinta
Assets
Current assets		613
Noncurrent assets		16,424
Liabilities and Equity
Current liabilities		679
Noncurrent liabilities		4,044
Noncontrolling interests		20
Adevinta
Income Statement
Revenues		450
Gross profit		147
Income (loss) from continuing operations		3
Net income		4
Adevinta | Adevinta
Income Statement
Net income		$ 3