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.

No definition available.

+ Details

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

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ 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=118939409&loc=d3e18845-111554

+ Details

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

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=bbt_NewlyDesignatedTDRsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bbt_DirectLendingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CreditCardReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_InterestRateBelowMarketReductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=bbt_ReModificationofPreviouslyDesignatedTDRsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Loans and ACL - Types of Modifications and Impact to Allowance (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Newly Designated TDRs \| Commercial \| Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
ALLL Impact	$ 1	$ 0	$ 2	$ 0
Newly Designated TDRs \| Commercial \| CRE
Financing Receivable, Troubled Debt Restructuring [Line Items]
ALLL Impact	0	0	0	0
Newly Designated TDRs \| Retail \| Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
ALLL Impact	3	4	7	9
Newly Designated TDRs \| Retail \| Direct
Financing Receivable, Troubled Debt Restructuring [Line Items]
ALLL Impact	0	0	0	0
Newly Designated TDRs \| Retail \| Indirect
Financing Receivable, Troubled Debt Restructuring [Line Items]
ALLL Impact	6	5	12	10
Newly Designated TDRs \| Revolving credit
Financing Receivable, Troubled Debt Restructuring [Line Items]
ALLL Impact	1	1	2	2
Newly Designated TDRs \| Rate \| Commercial \| Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	24	20	50	30
Newly Designated TDRs \| Rate \| Commercial \| CRE
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	0	8	1	27
Newly Designated TDRs \| Rate \| Retail \| Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	49	58	122	140
Newly Designated TDRs \| Rate \| Retail \| Direct
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	2	2	5	4
Newly Designated TDRs \| Rate \| Retail \| Indirect
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	50	45	98	87
Newly Designated TDRs \| Rate \| Revolving credit
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	5	4	11	9
Newly Designated TDRs \| Structure \| Commercial \| Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	3	33	6	43
Newly Designated TDRs \| Structure \| Commercial \| CRE
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	1	1	1	2
Newly Designated TDRs \| Structure \| Retail \| Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	6	5	14	15
Newly Designated TDRs \| Structure \| Retail \| Direct
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	1	1	2	1
Newly Designated TDRs \| Structure \| Retail \| Indirect
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	1	1	2	2
Newly Designated TDRs \| Structure \| Revolving credit
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	0	0	0	0
Re-Modification of Previously Designated TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
ALLL Impact	0	0	0	0
Re-Modification of Previously Designated TDRs \| Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	14	31	37	52
Re-Modification of Previously Designated TDRs \| Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs	$ 11	$ 5	$ 16	$ 10