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Loans - TDR Disclosures in Progress Financial Impact of Modification (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 998	$ 1,053	$ 1,520
Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	524	596	575
Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	275	241	356
Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	268	227	324
Consumer Banking | Home loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified		6	19
Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	7	8	13
Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	199	216	589
Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	198	213	586
Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	39	43	29
Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	159	170	557
Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 1	$ 3	$ 3
Reduced Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	67.00%	68.00%	55.00%
Average Rate Reduction	16.37%	16.84%	13.19%
Reduced Interest Rate | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	100.00%	100.00%	100.00%
Average Rate Reduction	20.12%	19.34%	18.02%
Reduced Interest Rate | Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	38.00%	48.00%	44.00%
Average Rate Reduction	3.68%	3.93%	3.79%
Reduced Interest Rate | Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	39.00%	49.00%	44.00%
Average Rate Reduction	3.63%	3.88%	3.82%
Reduced Interest Rate | Consumer Banking | Home loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity		28.00%	48.00%
Average Rate Reduction		1.78%	2.77%
Reduced Interest Rate | Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	11.00%	16.00%	22.00%
Average Rate Reduction	10.66%	10.92%	5.77%
Reduced Interest Rate | Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	19.00%	0.00%	18.00%
Average Rate Reduction	0.04%	1.03%	0.79%
Reduced Interest Rate | Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	19.00%	0.00%	18.00%
Average Rate Reduction	0.04%	1.03%	0.79%
Reduced Interest Rate | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	87.00%	0.00%	7.00%
Average Rate Reduction	0.00%	0.00%	0.02%
Reduced Interest Rate | Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	3.00%	0.00%	19.00%
Average Rate Reduction	0.33%	1.03%	0.80%
Reduced Interest Rate | Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%
Average Rate Reduction	0.00%	0.00%	0.00%
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	28.00%	32.00%	44.00%
Average Term Extension (Months)	7 months	12 months	16 months
Term Extension | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%
Average Term Extension (Months)	0 months	0 months	0 months
Term Extension | Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	89.00%	87.00%	93.00%
Average Term Extension (Months)	7 months	13 months	16 months
Term Extension | Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	90.00%	89.00%	95.00%
Average Term Extension (Months)	7 months	8 months	6 months
Term Extension | Consumer Banking | Home loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity		83.00%	78.00%
Average Term Extension (Months)		214 months	233 months
Term Extension | Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	54.00%	43.00%	73.00%
Average Term Extension (Months)	3 months	12 months	10 months
Term Extension | Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	18.00%	59.00%	57.00%
Average Term Extension (Months)	7 months	11 months	16 months
Term Extension | Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	18.00%	60.00%	57.00%
Average Term Extension (Months)	7 months	11 months	16 months
Term Extension | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	13.00%	80.00%	26.00%
Average Term Extension (Months)	1 month	5 months	5 months
Term Extension | Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	20.00%	54.00%	59.00%
Average Term Extension (Months)	8 months	13 months	17 months
Term Extension | Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	4.00%
Average Term Extension (Months)	0 months	0 months	0 months
Balance Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%
Gross Balance Reduction	$ 1	$ 1	$ 7
Balance Reduction | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 0
Balance Reduction | Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	2.00%	1.00%	2.00%
Gross Balance Reduction	$ 1	$ 1	$ 7
Balance Reduction | Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	1.00%	1.00%	2.00%
Gross Balance Reduction	$ 1	$ 1	$ 7
Balance Reduction | Consumer Banking | Home loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity		0.00%	2.00%
Gross Balance Reduction		$ 0	$ 0
Balance Reduction | Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	33.00%	0.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 0
Balance Reduction | Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 0
Balance Reduction | Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 0
Balance Reduction | 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
Balance Reduction | Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 0
Balance Reduction | Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 0
Domestic credit card | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 351	$ 412	$ 406
Domestic credit card | Reduced Interest Rate | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	100.00%	100.00%	100.00%
Average Rate Reduction	16.60%	15.93%	14.50%
Domestic credit card | Term Extension | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%
Average Term Extension (Months)	0 months	0 months	0 months
Domestic credit card | Balance Reduction | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 0
International card business | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 173	$ 184	$ 169
International card business | Reduced Interest Rate | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	100.00%	100.00%	100.00%
Average Rate Reduction	27.28%	26.96%	26.51%
International card business | Term Extension | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%
Average Term Extension (Months)	0 months	0 months	0 months
International card business | Balance Reduction | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 0

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