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Loans and ACL - Summary of Purchased Student Loans With Credit Deterioration (Details) - Consumer: - Student
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Financing Receivable  
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price $ 240
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date (3)
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium) 1
Financing Receivable, Purchased with Credit Deterioration, Amount at Par Value $ 242