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Loans - Trouble Debt Restructurings (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 481	$ 246	$ 1,185	$ 705
Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	89	128	313	387
Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	134	67	398	197
Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	133	66	393	190
Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	1	1	5	7
Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	258	51	474	121
Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified				120
Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	57		85	34
Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 201	$ 51	$ 389	86
Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified				$ 1
Reduced Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	19.00%	65.00%	29.00%	72.00%
Average Rate Reduction	20.08%	16.70%	18.49%	16.08%
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	20.94%	20.19%	20.22%	20.18%
Reduced Interest Rate | Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	4.00%	42.00%	9.00%	40.00%
Average Rate Reduction	4.75%	3.53%	3.76%	3.76%
Reduced Interest Rate | Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	3.00%	42.00%	9.00%	41.00%
Average Rate Reduction	4.83%	3.51%	3.68%	3.70%
Reduced Interest Rate | Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	85.00%	9.00%	9.00%	10.00%
Average Rate Reduction	3.24%	9.30%	10.85%	10.73%
Reduced Interest Rate | Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	9.00%	0.00%	32.00%
Average Rate Reduction	0.00%	1.00%	0.00%	0.07%
Reduced Interest Rate | Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity				32.00%
Average Rate Reduction				0.07%
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%	9.00%	0.00%	5.00%
Average Rate Reduction	0.00%	1.00%	0.00%	0.60%
Reduced Interest Rate | Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity				0.00%
Average Rate Reduction				0.00%
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	61.00%	27.00%	56.00%	28.00%
Average Term Extension (Months)	14 months	9 months	9 months	8 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	94.00%	88.00%	94.00%	89.00%
Average Term Extension (Months)	2 months	8 months	3 months	7 months
Term Extension | Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	94.00%	89.00%	95.00%	90.00%
Average Term Extension (Months)	2 months	8 months	3 months	8 months
Term Extension | Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	15.00%	0.00%	15.00%	54.00%
Average Term Extension (Months)	61 months	0 months	8 months	3 months
Term Extension | Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	64.00%	15.00%	61.00%	18.00%
Average Term Extension (Months)	23 months	14 months	16 months	9 months
Term Extension | Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity				18.00%
Average Term Extension (Months)				9 months
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)	4 months		6 months	0 months
Term Extension | Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	54.00%	15.00%	52.00%	25.00%
Average Term Extension (Months)	32 months	14 months	21 months	9 months
Term Extension | Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity				0.00%
Average Term Extension (Months)				0 months
Principal Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	1.00%	1.00%
Gross Balance Reduction	$ 1	$ 1	$ 8	$ 1
Principal Forgiveness | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 0	$ 0
Principal Forgiveness | Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	1.00%	0.00%	2.00%
Gross Balance Reduction	$ 1	$ 1	$ 1	$ 1
Principal Forgiveness | Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	1.00%	0.00%	1.00%
Gross Balance Reduction	$ 1	$ 1	$ 1	$ 1
Principal Forgiveness | Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%	34.00%
Gross Balance Reduction	$ 0	$ 0	$ 0	$ 0
Principal Forgiveness | Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	3.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 7	$ 0
Principal Forgiveness | Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity				0.00%
Gross Balance Reduction				$ 0
Principal Forgiveness | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%		0.00%	0.00%
Gross Balance Reduction	$ 0		$ 0	$ 0
Principal Forgiveness | Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	4.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 7	$ 0
Principal Forgiveness | Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity				0.00%
Gross Balance Reduction				$ 0
Domestic credit card: | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 50	$ 85	$ 195	$ 257
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	15.53%	16.76%	15.92%	16.58%
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%	0.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 0	$ 0
International card businesses: | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 39	$ 43	$ 118	$ 130
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	27.89%	27.08%	27.33%	27.25%
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%	0.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 0	$ 0

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