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Financing Receivables - Purchases, Sales and Nonperforming (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Nonperforming          
Financing Receivables          
Loans $ 9   $ 9   $ 21
Commercial Loans | Commercial mortgage loans          
Financing Receivables          
Loans sold 746   746    
Loans 1,901   1,901   2,725
Commercial Loans | Syndicated loans          
Financing Receivables          
Loans purchased 0 $ 96 37 $ 165  
Loans sold 360 5 368 12  
Loans 152   152   $ 595
Consumer Loans | Residential mortgage loans          
Financing Receivables          
Loans purchased 1 0 7 22  
Loans sold $ 3 $ 0 $ 3 $ 0