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Summary of Significant Accounting Policies - Carrying Values Of Investment Securities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule of AFS and HTM Securities [Line Items]
Available-for-sale investment securities	$ 826	$ 1,137
Debt securities, held-to-maturity	37	0
Total investment securities	863	1,137
Time deposits
Schedule of AFS and HTM Securities [Line Items]
Available-for-sale investment securities	790	1,130
Commercial paper
Schedule of AFS and HTM Securities [Line Items]
Available-for-sale investment securities	2	0
Equity securities
Schedule of AFS and HTM Securities [Line Items]
Available-for-sale investment securities	26	0
Debt securities
Schedule of AFS and HTM Securities [Line Items]
Available-for-sale investment securities	8	7
Corporate bonds
Schedule of AFS and HTM Securities [Line Items]
Debt securities, held-to-maturity	$ 37	$ 0

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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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