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Summary of Significant Accounting Policies - Short-Term and Long-Term Investment Securities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Accounting Policies [Abstract]
Gains (losses) on securities	$ 0	$ 0
Debt securities, held-to-maturity, sold, realized gain (loss)	0	$ 0
Available-for-sale securities
Available-for-sale investment securities	867,000,000		$ 1,137,000,000
Total investment securities	867,000,000		1,137,000,000
Time deposits
Available-for-sale securities
Available-for-sale investment securities	860,000,000		1,130,000,000
Debt securities
Available-for-sale securities
Available-for-sale investment securities	$ 7,000,000		$ 7,000,000

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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).

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