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Allowance for Credit Losses on Loans and Leases - Summary of Activity in Allowance for Loan and Lease Losses (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Valuation Allowance [Line Items]    
Balance, beginning of period $ 194 $ 148
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member  
Charge-offs $ (5) (14)
Recoveries 12  
Balance, end of period 202 174
Cumulative Effect, Period of Adoption, Adjustment    
Valuation Allowance [Line Items]    
Balance, beginning of period   $ 2
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member
Adjusted Balance    
Valuation Allowance [Line Items]    
Balance, beginning of period 194 $ 150
Mortgage Receivable    
Valuation Allowance [Line Items]    
Balance, beginning of period 176 123
Charge-offs (2)  
Recoveries 2  
Balance, end of period 177 157
Mortgage Receivable | Adjusted Balance    
Valuation Allowance [Line Items]    
Balance, beginning of period 176 123
Other Loans    
Valuation Allowance [Line Items]    
Balance, beginning of period 18 $ 25
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member
Charge-offs (3) $ (14)
Recoveries 10  
Balance, end of period 25 17
Other Loans | Cumulative Effect, Period of Adoption, Adjustment    
Valuation Allowance [Line Items]    
Balance, beginning of period   2
Other Loans | Adjusted Balance    
Valuation Allowance [Line Items]    
Balance, beginning of period 18 27
Non-Covered Loans    
Valuation Allowance [Line Items]    
Provision for credit losses 1 38
Non-Covered Loans | Mortgage Receivable    
Valuation Allowance [Line Items]    
Provision for credit losses $ 1 34
Non-Covered Loans | Other Loans    
Valuation Allowance [Line Items]    
Provision for credit losses   $ 4