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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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