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Loans - Trouble Debt Restructurings (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 412	$ 186	$ 704	$ 459
Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	84	114	224	259
Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	138	57	264	130
Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	137	52	260	124
Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	1	5	4	6
Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	190	15	216	70
Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified		14		69
Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	9		28	34
Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 181	14	$ 188	35
Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified		$ 1		$ 1
Reduced Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	22.00%	75.00%	36.00%	75.00%
Average Rate Reduction	17.96%	17.45%	17.90%	15.78%
Reduced Interest Rate | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	100.00%	100.00%	100.00%	100.00%
Average Rate Reduction	19.14%	20.32%	19.94%	20.17%
Reduced Interest Rate | Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	5.00%	42.00%	12.00%	39.00%
Average Rate Reduction	4.19%	3.93%	3.55%	3.90%
Reduced Interest Rate | Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	5.00%	46.00%	12.00%	41.00%
Average Rate Reduction	4.12%	3.78%	3.51%	3.81%
Reduced Interest Rate | Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	10.00%	9.00%	4.00%	10.00%
Average Rate Reduction	8.37%	10.55%	11.42%	10.91%
Reduced Interest Rate | Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%	49.00%
Average Rate Reduction	0.00%	0.00%	0.00%	0.00%
Reduced Interest Rate | Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity		0.00%		49.00%
Average Rate Reduction		0.00%		0.00%
Reduced Interest Rate | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%		0.00%	100.00%
Average Rate Reduction	0.00%		0.00%	0.00%
Reduced Interest Rate | Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%	0.00%
Average Rate Reduction	0.00%	0.00%	0.00%	0.00%
Reduced Interest Rate | Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity		0.00%		0.00%
Average Rate Reduction		0.00%		0.00%
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	57.00%	34.00%	52.00%	28.00%
Average Term Extension (Months)	5 months	7 months	5 months	6 months
Term Extension | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%	0.00%
Average Term Extension (Months)	0 months	0 months	0 months	0 months
Term Extension | Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	95.00%	86.00%	93.00%	89.00%
Average Term Extension (Months)	3 months	8 months	4 months	7 months
Term Extension | Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	95.00%	89.00%	95.00%	90.00%
Average Term Extension (Months)	3 months	8 months	4 months	7 months
Term Extension | Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	59.00%	57.00%	15.00%	61.00%
Average Term Extension (Months)	4 months	3 months	4 months	3 months
Term Extension | Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	55.00%	98.00%	57.00%	20.00%
Average Term Extension (Months)	8 months	3 months	9 months	0 months
Term Extension | Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity		100.00%		20.00%
Average Term Extension (Months)		3 months		1 month
Term Extension | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	100.00%		100.00%	0.00%
Average Term Extension (Months)	7 months		10 months	0 months
Term Extension | Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	52.00%	100.00%	50.00%	40.00%
Average Term Extension (Months)	8 months	3 months	8 months	1 month
Term Extension | Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity		0.00%		0.00%
Average Term Extension (Months)		0 months		0 months
Principal Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	4.00%		2.00%
Gross Balance Reduction	$ 7		$ 7
Principal Forgiveness | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%		0.00%
Gross Balance Reduction	$ 0		$ 0
Principal Forgiveness | Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%		0.00%
Gross Balance Reduction	$ 0		$ 0
Principal Forgiveness | Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%		0.00%
Gross Balance Reduction	$ 0		$ 0
Principal Forgiveness | Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%		0.00%
Gross Balance Reduction	$ 0		$ 0
Principal Forgiveness | Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	8.00%		7.00%
Gross Balance Reduction	$ 7		$ 7
Principal Forgiveness | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%		0.00%
Gross Balance Reduction	$ 0		$ 0
Principal Forgiveness | Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	9.00%		8.00%
Gross Balance Reduction	$ 7		$ 7
Domestic credit card: | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 56	$ 74	$ 145	$ 172
Domestic credit card: | Reduced Interest Rate | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	100.00%	100.00%	100.00%	100.00%
Average Rate Reduction	15.41%	16.60%	16.05%	16.50%
Domestic credit card: | Term Extension | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%	0.00%
Average Term Extension (Months)	0 months	0 months	0 months	0 months
Domestic credit card: | Principal Forgiveness | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%		0.00%
Gross Balance Reduction	$ 0		$ 0
International card businesses: | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 28	$ 40	$ 79	$ 87
International card businesses: | Reduced Interest Rate | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	100.00%	100.00%	100.00%	100.00%
Average Rate Reduction	26.56%	27.25%	27.05%	27.44%
International card businesses: | Term Extension | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%	0.00%
Average Term Extension (Months)	0 months	0 months	0 months	0 months
International card businesses: | Principal Forgiveness | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%		0.00%
Gross Balance Reduction	$ 0		$ 0

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