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Loans - Trouble Debt Restructurings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 1,489	$ 998	$ 1,053
Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	411	524	596
Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	541	275	241
Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	536	268	227
Consumer Banking | Home Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified			6
Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	5	7	8
Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	537	199	216
Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified		198	213
Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	98	39	43
Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 439	159	170
Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified		$ 1	$ 3
Reduced Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	33.00%	67.00%	68.00%
Average Rate Reduction	18.06%	16.37%	16.84%
Reduced Interest Rate | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	100.00%	100.00%	100.00%
Average Rate Reduction	20.61%	20.12%	19.34%
Reduced Interest Rate | Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	11.00%	38.00%	48.00%
Average Rate Reduction	5.73%	3.68%	3.93%
Reduced Interest Rate | Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	11.00%	39.00%	49.00%
Average Rate Reduction	5.68%	3.63%	3.88%
Reduced Interest Rate | Consumer Banking | Home Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity			28.00%
Average Rate Reduction			1.78%
Reduced Interest Rate | Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	11.00%	11.00%	16.00%
Average Rate Reduction	10.86%	10.66%	10.92%
Reduced Interest Rate | Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	3.00%	19.00%	0.00%
Average Rate Reduction	0.14%	0.04%	1.03%
Reduced Interest Rate | Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity		19.00%	0.00%
Average Rate Reduction		0.04%	1.03%
Reduced Interest Rate | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	87.00%	0.00%
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	4.00%	3.00%	0.00%
Average Rate Reduction	0.14%	0.33%	1.03%
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	55.00%	28.00%	32.00%
Average Term Extension (Months)	8 months	7 months	12 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	94.00%	89.00%	87.00%
Average Term Extension (Months)	3 months	7 months	13 months
Term Extension | Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	95.00%	90.00%	89.00%
Average Term Extension (Months)	3 months	7 months	8 months
Term Extension | Consumer Banking | Home Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity			83.00%
Average Term Extension (Months)			214 months
Term Extension | Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	20.00%	54.00%	43.00%
Average Term Extension (Months)	8 months	3 months	12 months
Term Extension | Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	58.00%	18.00%	59.00%
Average Term Extension (Months)	17 months	7 months	11 months
Term Extension | Commercial Banking | Total commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity		18.00%	60.00%
Average Term Extension (Months)		7 months	11 months
Term Extension | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	86.00%	13.00%	80.00%
Average Term Extension (Months)	5 months	1 month	5 months
Term Extension | Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	52.00%	20.00%	54.00%
Average Term Extension (Months)	21 months	8 months	13 months
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	1.00%	0.00%	0.00%
Gross Balance Reduction	$ 8	$ 1	$ 1
Principal Forgiveness | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	0.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 0
Principal Forgiveness | Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	2.00%	1.00%
Gross Balance Reduction	$ 1	$ 1	$ 1
Principal Forgiveness | Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	1.00%	1.00%
Gross Balance Reduction	$ 1	$ 1	$ 1
Principal Forgiveness | Consumer Banking | Home Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity			0.00%
Gross Balance Reduction			$ 0
Principal Forgiveness | Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	0.00%	33.00%	0.00%
Gross Balance Reduction	$ 0	$ 0	$ 0
Principal Forgiveness | Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	3.00%	0.00%	0.00%
Gross Balance Reduction	$ 7	$ 0	$ 0
Principal Forgiveness | Commercial Banking | Total commercial lending
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 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	4.00%	0.00%	0.00%
Gross Balance Reduction	$ 7	$ 0	$ 0
Principal Forgiveness | Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity		0.00%	0.00%
Gross Balance Reduction		$ 0	$ 0
Domestic credit card: | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 243	$ 351	$ 412
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	15.94%	16.60%	15.93%
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: | Principal Forgiveness | 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 businesses: | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans Modified	$ 168	$ 173	$ 184
International card businesses: | Reduced Interest Rate | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	100.00%	100.00%	100.00%
Average Rate Reduction	27.38%	27.28%	26.96%
International card businesses: | 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 businesses: | Principal Forgiveness | 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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