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Loans and Allowance for Credit Losses - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
loan
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
loan_segment
loan
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
loan
Mar. 31, 2020
USD ($)
Mar. 31, 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 $ 7,510   $ 7,510   $ 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      
Number of contracts | loan     0   0      
Loans no longer meeting similar risk of collective pool | loan 1   1   1      
Loans no longer meeting similar risk of collective pool, amount $ 25   $ 25   $ 25      
Loans, allowance for losses $ 141 $ 72 $ 141 $ 72 74   $ 70 $ 67
Investment grade loans 79.00%   79.00%          
Speculative grade loans 21.00%   21.00%          
Speculative senior secured loans with BB or B rating 83.00%   83.00%          
Provision for credit losses $ 52 $ 1 $ 88 $ 5        
Commercial and Financial Segment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans, allowance for losses         1      
Leveraged loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Proceeds from sale of loans receivable 127              
Financing receivable, held-for-sale 23   23          
Includes Allowances on Unfunded Commitments                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans, allowance for losses 163   163   $ 93 $ 124    
Provision for credit losses $ 52   $ 88