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Summary of Significant Accounting Policies - Cloud-Hosted Arrangements (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Accounting Policies [Abstract] |  |
Implementation costs, gross | $ 76 | $ 67
Accumulated amortization | (29) | (13)
Implementation costs, net | $ 47 | $ 54

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