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Guarantees and Commitments (Schedule of Guarantor Obligations) (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Guarantor Obligations [Line Items]    
Standby letters of credit and other guarantees $ 3,000,000 $ 4,000,000
Cash collateral received for standby letters of credit 0  
Maximum    
Guarantor Obligations [Line Items]    
Standby letters of credit and other guarantees $ 234,000,000 $ 262,000,000