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Summary of Significant Accounting Policies - Short-Term and Long-Term Investment Securities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Accounting Policies [Abstract]
Gains (losses) on securities	$ 0	$ 0
Debt securities, held-to-maturity, sold, realized gain (loss)	0	0
Unrealized loss on investments	2,000,000	$ 0
Available-for-sale investment securities
Available-for-sale investment securities	936,000,000		$ 800,000,000
Held-to-maturity investment securities	100,000,000		37,000,000
Total investment securities	1,060,000,000		863,000,000
Time deposits
Available-for-sale investment securities
Available-for-sale investment securities	865,000,000		790,000,000
Commercial paper
Available-for-sale investment securities
Available-for-sale investment securities	61,000,000		2,000,000
Debt securities
Available-for-sale investment securities
Available-for-sale investment securities	10,000,000		8,000,000
Corporate bonds
Available-for-sale investment securities
Held-to-maturity investment securities	100,000,000		37,000,000
Equity investment securities
Available-for-sale investment securities
Equity investment securities	$ 24,000,000		$ 26,000,000

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