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Summary of Significant Accounting Policies - Investments and Financing Receivables (Details)
12 Months Ended
Dec. 31, 2021
Available-for-Sale securities:  
Period past due for nonaccrual status 90 days
COVID 19 loan modifications | Maximum  
Financing Receivables  
Period past due 30 days
Commercial Loans | Commercial mortgage loans  
Financing Receivables  
Period past due for nonaccrual status 90 days
Commercial Loans | Syndicated loans  
Financing Receivables  
Period past due for nonaccrual status 90 days
Consumer Loans | Credit card receivables  
Financing Receivables  
Period past due receivables are fully charged off 180 days