Loans and Allowance for Credit Losses - Schedule of Activity In The Allowance For Loan Losses (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 122
Provision for credit losses	33
Ending balance	$ 87

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant