Loans - Consumer, Excluding Credit Card Loans, Other Consumer Impaired Loans and Loan Modifications (Details) - Consumer, excluding credit card - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Residential real estate – PCI
Impaired loans
Remaining weighted-average life of portfolio	7 years
Total other consumer
Impaired loans
With an allowance	$ 222	$ 272
Without an allowance	29	26
Total impaired loans	251	298
Allowance for loan losses related to impaired loans	63	73
Unpaid principal balance of impaired loans	355	402
Impaired loans on nonaccrual status	229	268
Average impaired loans	275	427	$ 635
Loans modified in TDRs	79	102
TDRs on nonaccrual status	$ 57	$ 72

Financing Receivable, Modifications, Recorded Investment, Nonaccrual Status

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- Definition

Impaired Financing Receivable, Recorded Investment, Nonaccrual Status

+ References

No definition available.

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- Definition

Weighted Average Life of PCI Portfolio

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No definition available.

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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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
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Amount of allowance for credit losses related to recorded investment.

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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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