Loans - Summary of Consumer Loans by Refreshed FICO Credit Score (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 115,557	$ 110,345
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	100.00%	100.00%
FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 7,020
Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 4,112	$ 4,747
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	100.00%	100.00%
Installment [Member] \| FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	$ 1,144
2019	1,579
2018	1,169
2017	210
2016	10
Total loans, gross	$ 4,112
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	100.00%
Credit card [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 2,908	$ 1,858
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	100.00%	100.00%
Credit card [Member] \| FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 2,908
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	100.00%
Greater than or equal to 660 [Member] \| FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 5,887
Greater than or equal to 660 [Member] \| Installment [Member] \| FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	1,116
2019	1,434
2018	984
2017	170
2016	8
Total loans, gross	$ 3,712
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	90.00%
Greater than or equal to 660 [Member] \| Credit card [Member] \| FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 2,175
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	75.00%
Less than 660 [Member] \| FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 1,133
Less than 660 [Member] \| Installment [Member] \| FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	28
2019	145
2018	185
2017	40
2016	2
Total loans, gross	$ 400
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	10.00%
Less than 660 [Member] \| Credit card [Member] \| FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 733
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	25.00%

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Amount of financing receivable originated four years prior to current fiscal year.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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