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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
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Valuation Allowance [Line Items]    
Balance, beginning of period $ 199 $ 194
Charge-offs (5) (5)
Recoveries 10 12
Provision for (recovery of) credit losses 14 1
Balance, end of period 218 202
Mortgage Receivable    
Valuation Allowance [Line Items]    
Balance, beginning of period 178 176
Charge-offs (5) (2)
Recoveries 4 2
Provision for (recovery of) credit losses 31 1
Balance, end of period 208 177
Other Loans    
Valuation Allowance [Line Items]    
Balance, beginning of period 21 18
Charge-offs   (3)
Recoveries 6 10
Provision for (recovery of) credit losses (17)  
Balance, end of period $ 10 $ 25