Loans - Summary of Consumer Loans by Refreshed FICO Credit Score (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 119,989	$ 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	$ 8,093
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	100.00%
Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 3,823	$ 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	$ 1,359
2019	1,357
2018	942
2017	158
2016	7
Total loans, gross	$ 3,823
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	$ 4,270	$ 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	$ 4,270
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	$ 6,870
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	85.00%
Greater than or equal to 660 [Member] \| Installment [Member] \| FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	$ 1,321
2019	1,225
2018	792
2017	128
2016	6
Total loans, gross	$ 3,472
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	91.00%
Greater than or equal to 660 [Member] \| Credit card [Member] \| FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 3,398
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	80.00%
Less than 660 [Member] \| FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 1,223
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	15.00%
Less than 660 [Member] \| Installment [Member] \| FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	$ 38
2019	132
2018	150
2017	30
2016	1
Total loans, gross	$ 351
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	9.00%
Less than 660 [Member] \| Credit card [Member] \| FICO [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 872
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score	20.00%

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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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