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Securitizations and Variable Interest Entities, Sale of Student Loan Portfolio (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Variable Interest Entity [Line Items]
Loans	$ 861,572	$ 887,637	$ 1,009,843
Student loan [Member]
Variable Interest Entity [Line Items]
Asset balances sold	5,600
Proceeds from transfer	5,800
Net gains (losses) on sale	208
Student loan [Member] \| Collateralized financing receivable [Member]
Variable Interest Entity [Line Items]
Loans	$ 2,200