Summary of Significant Accounting Policies - Arrangements (Details) - USD ($) $ in Billions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Reduction of interest income	$ 1.0	$ 1.1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration