Loans and ACL (Summary of Loans Collectively Evaluated for Impairment) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable [Line Items]
Recorded Investment	$ 141,395	$ 134,398
Related ALLL	1,297	1,300
Commercial \| Commercial and industrial
Financing Receivable [Line Items]
Recorded Investment	51,253	48,110
Related ALLL	463	439
Commercial \| CRE-income producing properties
Financing Receivable [Line Items]
Recorded Investment	14,455	13,339
Related ALLL	112	127
Commercial \| CRE-construction and development
Financing Receivable [Line Items]
Recorded Investment	3,787	3,697
Related ALLL	21	32
Commercial \| Dealer floor plan
Financing Receivable [Line Items]
Recorded Investment	1,413	1,215
Related ALLL	11	8
Commercial \| Other lending subsidiaries
Financing Receivable [Line Items]
Recorded Investment	7,678	6,789
Related ALLL	28	21
Retail \| Direct retail lending
Financing Receivable [Line Items]
Recorded Investment	12,011	11,055
Related ALLL	93	93
Retail \| Revolving credit
Financing Receivable [Line Items]
Recorded Investment	2,626	2,477
Related ALLL	95	91
Retail \| Residential mortgage-nonguaranteed
Financing Receivable [Line Items]
Recorded Investment	28,488	29,199
Related ALLL	136	153
Retail \| Residential mortgage-government guaranteed
Financing Receivable [Line Items]
Recorded Investment	466	553
Related ALLL	8	1
Retail \| Sales finance
Financing Receivable [Line Items]
Recorded Investment	11,251	10,308
Related ALLL	37	39
Retail \| Other lending subsidiaries
Financing Receivable [Line Items]
Recorded Investment	7,057	6,534
Related ALLL	249	235
PCI
Financing Receivable [Line Items]
Recorded Investment	910	1,122
Related ALLL	$ 44	$ 61

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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