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Summary of Significant Accounting Policies - Short-Term and Long-Term Investment Securities (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Accounting Policies [Abstract]
Gains (losses) on securities	$ 0	$ 0	$ 0	$ 0
Material gains or losses recorded on held-to-maturity securities	0	0	0	0
Unrealized loss on investments	6,000,000	$ 0	8,000,000	$ 0
Available-for-sale investment securities
Available-for-sale investment securities	856,000,000		856,000,000		$ 800,000,000
Held-to-maturity investment securities	120,000,000		120,000,000		37,000,000
Equity investment securities	17,000,000		17,000,000		26,000,000
Total investment securities	993,000,000		993,000,000		863,000,000
Time deposits
Available-for-sale investment securities
Available-for-sale investment securities	795,000,000		795,000,000		790,000,000
Debt securities
Available-for-sale investment securities
Available-for-sale investment securities	10,000,000		10,000,000		8,000,000
Commercial Paper
Available-for-sale investment securities
Available-for-sale investment securities	51,000,000		51,000,000		2,000,000
Corporate bonds
Available-for-sale investment securities
Held-to-maturity investment securities	120,000,000		120,000,000		37,000,000
Equity investment securities
Available-for-sale investment securities
Equity investment securities	$ 17,000,000		$ 17,000,000		$ 26,000,000

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