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Loans and Allowance for Credit Losses - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
loan
loan_segment
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
loan
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Number of loans and leases segments | loan_segment     2          
Loans and leases pledged as collateral $ 6,930   $ 6,930   $ 6,750      
Number of loans on non-accrual status | loan 0   0   0      
Loans or leases 30 days or more past due | loan 0   0   0      
Loss on sale of financing receivables $ 11              
Number of contracts | loan     0   0      
Loans no longer meeting similar risk of collective pool | loan 2   2   1      
Loans no longer meeting similar risk of collective pool, amount $ 18   $ 18   $ 25      
Loans, allowance for credit losses $ 134 $ 71 $ 134 $ 71 74   $ 72 $ 67
Investment grade loans 81.00%   81.00%          
Speculative grade loans 18.00%   18.00%          
Speculative senior secured loans with BB or B rating 84.00%   84.00%          
Provision for credit losses $ 0 $ 2 $ 88 $ 7        
Commercial and Financial Segment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans, allowance for credit losses         1      
Leveraged loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Proceeds from sale of loans receivable 55              
Financing receivable, held-for-sale 10   10          
Includes Allowances on Unfunded Commitments                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans, allowance for credit losses 153   153   $ 93 $ 163    
Provision for credit losses $ 0   $ 88