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Debt (Details Textuals)
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]      
Line of credit maintained $ 3,500,000,000 $ 3,500,000,000  
Ratio of combined earnings and fixed earnings to fixed charges required to maintain availability of credit line 1.25    
Amount drawn from committed lines $ 2,000,000,000 0  
Fees to maintain credit lines 15,700,000 14,200,000  
Total interest paid $ 1,100,000,000 2,000,000,000 $ 3,400,000,000
Minimum      
Debt Instrument [Line Items]      
Common equity tier one ratio 4.5    
Maximum      
Debt Instrument [Line Items]      
Common equity tier one ratio 6.5    
Short-term Debt      
Debt Instrument [Line Items]      
Fees to maintain the secured financing facility $ 7,800,000 7,700,000  
Charge Trust      
Debt Instrument [Line Items]      
Specified date face amount of eligible notes issued Jul. 15, 2024    
Debt instrument, term 3 years    
Face amount of eligible notes from Charge Trust $ 3,000,000,000    
Lending Trust      
Debt Instrument [Line Items]      
Debt term 3 years    
Face amount of eligible notes issued $ 2,000,000,000    
Specified date face amount of eligible notes issued Sep. 16, 2024    
Subsidiaries      
Debt Instrument [Line Items]      
Line of credit maintained $ 145,000,000 148,000,000  
Amount drawn from committed lines $ 7,200,000 $ 0