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Loans and Allowance for Credit Losses - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
loan
loanSegment
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
loan
Financing Receivable, Credit Quality Indicator [Line Items]          
Number of loans and leases segments | loanSegment     2    
Loans and leases pledged as collateral $ 9,000   $ 9,000   $ 8,070
Number of loans on non-accrual status | loan 0   0   0
Sale of loans     $ 64 $ 242  
Loss on sale of loans     $ (46)    
Number of loans classified as doubtful and pending settlement | loan 1   1    
Doubtful loans $ 32,797   $ 32,797   $ 27,925
Loans modified in troubled debt restructurings | loan 0        
Loans no longer meeting similar risk of collective pool | loan 9   9    
Loans no longer meeting similar risk of collective pool, amount $ 232   $ 232    
Allowance for credit loss $ 95   $ 95   122
Investment grade loans 82.00%   82.00%    
Speculative grade loans 17.00%   17.00%    
Speculative senior secured loans with BB or B rating 88.00%   88.00%    
Allowance for credit loss, period increase (decrease) $ (4) $ 10      
Provision for credit losses (2)        
Doubtful          
Financing Receivable, Credit Quality Indicator [Line Items]          
Doubtful loans 15   $ 15   17
Collateralized Loan Obligations          
Financing Receivable, Credit Quality Indicator [Line Items]          
Payments to acquire CLO loans 832        
Leveraged Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Sale of loans 84        
Commercial and Financial Segment          
Financing Receivable, Credit Quality Indicator [Line Items]          
Doubtful loans 30,413   30,413   25,829
Allowance for credit loss 13   13    
Commercial and Financial Segment | Doubtful          
Financing Receivable, Credit Quality Indicator [Line Items]          
Doubtful loans $ 15   $ 15   $ 17