Loans and Allowance for Credit Losses, Impaired Loans, Average Recorded Investment and Interest Income (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	$ 13,742	$ 17,426	$ 15,147	$ 17,900
Recognized interest income	206	289	690	851
Interest income:
Cash basis of accounting	55	92	190	257
Other	151	197	500	594
Total Commercial [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	3,275	3,680	3,402	3,730
Recognized interest income	44	77	150	209
Commercial and industrial loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	2,036	2,325	2,173	2,316
Recognized interest income	26	59	99	138
Commercial real estate mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	1,113	1,172	1,086	1,225
Recognized interest income	14	16	45	66
Commercial real estate construction [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	48	66	51	62
Recognized interest income	3	2	5	4
Commercial lease financing receivable [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	78	117	92	127
Recognized interest income	1	0	1	1
Total Consumer [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	10,467	13,746	11,745	14,170
Recognized interest income	162	212	540	642
Real estate 1-4 family first mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	8,165	11,318	9,400	11,718
Recognized interest income	116	165	397	504
Real estate 1-4 family junior lien mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	1,561	1,775	1,622	1,832
Recognized interest income	24	29	76	87
Credit Card [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	495	421	479	396
Recognized interest income	16	14	47	36
Automobile [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	83	87	85	85
Recognized interest income	3	2	10	8
Other revolving credit and installment [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	163	145	159	139
Recognized interest income	$ 3	$ 2	$ 10	$ 7

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5258-111524

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