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Loans - TDR - Subsequent Defaults (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) contract	Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	96,905	122,156	129,120
Total Loans | $	$ 414	$ 306	$ 437
Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	91,002	116,556	122,084
Total Loans | $	$ 156	$ 209	$ 232
Consumer Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	5,887	5,599	7,009
Total Loans | $	$ 78	$ 72	$ 82
Consumer Banking | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	5,877	5,575	6,980
Total Loans | $	$ 77	$ 70	$ 79
Consumer Banking | Home Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0	3
Total Loans | $	$ 0	$ 0	$ 1
Consumer Banking | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	10	24	26
Total Loans | $	$ 1	$ 2	$ 2
Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	16	1	27
Total Loans | $	$ 180	$ 25	$ 123
Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	1	0	1
Total Loans | $	$ 50	$ 0	$ 3
Commercial Banking | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	15	1	26
Total Loans | $	$ 130	$ 25	$ 120
Domestic credit card: | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	32,639	47,086	61,070
Total Loans | $	$ 69	$ 99	$ 126
International card businesses: | Credit Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	58,363	69,470	61,014
Total Loans | $	$ 87	$ 110	$ 106

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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