Loans - Consumer, Excluding Credit Card Loans, Impaired Loans (Details) - Consumer, excluding credit card $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($) payment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Impaired loans:
Loans modified subsequent to repurchase from Ginnie Mae	$ 3,400	$ 3,800
TDRs not having yet made six payments	2,300	2,500
Total residential real estate – excluding PCI
Impaired loans:
With an allowance	5,955	6,536
Without an allowance	2,341	2,512
Total impaired loans	8,296	9,048
Allowance for loan losses related to impaired loans	189	246
Unpaid principal balance of impaired loans	12,132	13,042
Impaired loans on nonaccrual status	2,871	3,177
Average impaired loans	8,687	10,066	$ 12,609
Interest income on impaired loans	430	476	581
Interest income on impaired loans on a cash basis	$ 157	172	195
Number of payments under modified terms to recognize interest on cash basis \| payment	6
Home equity
Impaired loans:
With an allowance	$ 1,266	1,293
Without an allowance	998	1,065
Total impaired loans	2,264	2,358
Allowance for loan losses related to impaired loans	121	138
Unpaid principal balance of impaired loans	3,847	3,960
Impaired loans on nonaccrual status	1,116	1,220
Average impaired loans	2,311	2,369	2,435
Interest income on impaired loans	125	128	137
Interest income on impaired loans on a cash basis	$ 80	85	90
Home equity \| Permanent Modification
Impaired loans:
Rate of default for modified loans, estimated weighted average	12.00%
Residential mortgage
Impaired loans:
With an allowance	$ 4,689	5,243
Without an allowance	1,343	1,447
Total impaired loans	6,032	6,690
Allowance for loan losses related to impaired loans	68	108
Unpaid principal balance of impaired loans	8,285	9,082
Impaired loans on nonaccrual status	1,755	1,957
Average impaired loans	6,376	7,697	10,174
Interest income on impaired loans	305	348	444
Interest income on impaired loans on a cash basis	$ 77	$ 87	$ 105
Residential mortgage \| Permanent Modification
Impaired loans:
Rate of default for modified loans, estimated weighted average	16.00%

Impaired Financing Receivable, Recorded Investment, Nonaccrual Status

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- Definition

Represents the carrying amount of loans with terms that have been modified in trouble debt restructurings that have not yet made six payments under the modified terms.

+ References

No definition available.

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- Definition

Loans that are repurchased from US government agencies, such as the Government National Mortgage Association (GNMA or Ginnie Mae), and modified subsequent to repurchase. These loans are excluded from loans accounted for as troubled debt restructurings.

+ References

No definition available.

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- Definition

For loans modified in TDRs, the number of borrower payments under the modified terms to generally be recognized as interest income on a cash basis.

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This item represents the estimated weighted average default rate for modified loans.

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- Definition

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

+ References

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)
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-Section 50
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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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Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
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Amount of allowance for credit losses related to recorded investment.

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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-Publisher FASB
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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

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