Carrying amount of loans held for investment sold during the period

No definition available.

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Namespace Prefix:	bbt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the dollar values of loans purchased that were not part of a business combination.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=bbt_NonaccrualFinancingReceivableMember
Namespace Prefix:
Data Type:	na
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- Details

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Namespace Prefix:
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Period Type:

Loans and ACL - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Loans and ACL - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable [Line Items]
Modifications that defaulted during the period that had been classified as a TDR during the previous 12 months	$ 104	$ 73	$ 81
Retail \| Indirect
Financing Receivable [Line Items]
Purchased loan portfolio	244	$ 2,900
Retail \| Residential mortgage
Financing Receivable [Line Items]
Loans sold	905
Nonaccrual loans \| Retail \| Residential mortgage
Financing Receivable [Line Items]
Loans sold	61
Performing TDRs \| Retail \| Residential mortgage
Financing Receivable [Line Items]
Loans sold	$ 331