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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	$ 21,112	$ 24,781	$ 21,509	$ 24,499
Recognized interest income	292	315	587	636
Interest income:
Cash basis of accounting	77	92	155	187
Other	215	223	432	449
Total Commercial [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	4,925	5,707	5,039	5,077
Recognized interest income	62	58	123	111
Commercial and Industrial Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	3,390	3,803	3,457	3,146
Recognized interest income	36	21	69	40
Commercial real estate mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	1,371	1,695	1,397	1,730
Recognized interest income	24	34	51	66
Commercial Real Estate Construction [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	66	116	75	122
Recognized interest income	2	3	3	5
Commercial Lease Financing Receivable [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	98	93	110	79
Recognized interest income	0	0	0	0
Total Consumer [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	16,187	19,074	16,470	19,422
Recognized interest income	230	257	464	525
Real estate 1-4 family first mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	13,602	16,278	13,866	16,595
Recognized interest income	185	211	375	432
Real estate 1-4 family junior lien mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	2,075	2,325	2,103	2,354
Recognized interest income	31	33	62	67
Credit Card [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	313	293	308	295
Recognized interest income	9	8	17	17
Automobile [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	83	94	83	98
Recognized interest income	3	3	6	6
Other revolving credit and installment [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	114	84	110	80
Recognized interest income	$ 2	$ 2	$ 4	$ 3

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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