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Allowance for Credit Losses - Allowance for Credit Losses and Liability for Off-balance Sheet Credit Exposures (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Loans $ 1,084 $ 1,192 $ 467 $ 637 $ 676 $ 613 $ 541
Securities held-to-maturity [2] 2 [1]   2        
Other financial assets measured at amortized cost [3] 3   3        
Securities available-for-sale [2] 2 [1]   3        
Total allowance for credit losses 1,091   475        
Liability for off-balance sheet credit exposures $ 225 253 $ 158 158 $ 89 90 96
As Previously Reported [Member]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Loans       637      
Securities held-to-maturity [2]       0      
Other financial assets measured at amortized cost [3]       0      
Securities available-for-sale [2]       0      
Total allowance for credit losses       637      
Liability for off-balance sheet credit exposures   $ 253   $ 104   $ 90 $ 96
[1] As discussed in Note 21, "New Accounting Pronouncements," beginning January 1, 2020, an allowance for credit losses is recognized for debt securities while, prior to January 1, 2020, debt securities were assessed for other-than-temporary impairment. At December 31, 2019, we did not consider any of our debt securities to be other-than-temporarily impaired.
[2] See Note 4, "Securities," for additional information regarding the allowance for credit losses associated with our security portfolios.
[3] Primarily includes accrued interest receivables and customer acceptances.