Loans and Allowance for Credit Losses, Impaired Loans, Average Recorded Investment and Interest Income (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	$ 15,296	$ 17,935	$ 15,797	$ 18,161
Recognized interest income	242	281	484	562
Interest income:
Cash basis of accounting	76	84	135	165
Other	166	197	349	397
Total Commercial [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	3,544	3,711	3,479	3,776
Recognized interest income	66	67	106	132
Commercial and industrial loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	2,285	2,212	2,249	2,318
Recognized interest income	50	43	73	79
Commercial real estate mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	1,116	1,299	1,079	1,266
Recognized interest income	16	22	31	50
Commercial real estate construction [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	55	62	53	60
Recognized interest income	0	1	2	2
Commercial lease financing receivable [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	88	138	98	132
Recognized interest income	0	1	0	1
Total Consumer [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	11,752	14,224	12,318	14,385
Recognized interest income	176	214	378	430
Real estate 1-4 family first mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	9,398	11,772	9,950	11,921
Recognized interest income	128	167	281	339
Real estate 1-4 family junior lien mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	1,630	1,832	1,654	1,861
Recognized interest income	26	29	52	58
Credit Card [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	480	398	470	384
Recognized interest income	16	12	31	22
Automobile [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	86	82	87	83
Recognized interest income	3	3	7	6
Other revolving credit and installment [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	158	140	157	136
Recognized interest income	$ 3	$ 3	$ 7	$ 5

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=84173941&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=84173941&loc=d3e5258-111524

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