Loans and ACL (Changes in Carrying Amount and Accretable Yield for Loans Acquired From FDIC) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Purchased Impaired Loans [Member]
Accretable yield for purchased loans, beginning balance	$ 187	$ 264
Accretion	(107)	(149)
Other, net	54	72
Accretable yield for purchased loans, ending balance	134	187
Carrying amount of loans, beginning balance	863	1,400
Accretion	107	149
Payments received, net	(391)	(686)
Carrying amount of loans, ending balance	579	863
Outstanding UPB at end of period	864	1,266
Purchased Nonimpaired Loans [Member]
Accretable yield for purchased loans, beginning balance	351	617
Accretion	(169)	(301)
Other, net	62	35
Accretable yield for purchased loans, ending balance	244	351
Carrying amount of loans, beginning balance	1,172	1,894
Accretion	169	301
Payments received, net	(705)	(1,023)
Carrying amount of loans, ending balance	636	1,172
Outstanding UPB at end of period	$ 860	$ 1,516

Carrying amount of loans accounted for under the accretion method.

No definition available.

Name:	bbt_CarryingAmountOfLoans
Namespace Prefix:	bbt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Other changes in accretable yield including reclassifications from nonacretable balance

+ References

No definition available.

+ Details

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

- Definition

Current period recognition due to accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan for loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

No definition available.

+ Details

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

- Definition

Net payments received during the period on purchased loans.

+ References

No definition available.

+ Details

Name:	bbt_ChangeInCarryingAmountOfLoansPaymentsReceivedNet
Namespace Prefix:	bbt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the unpaid principal balance of loans

+ References

No definition available.

+ Details

Name:	bbt_UnpaidPrincipalBalance
Namespace Prefix:	bbt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 15

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

+ Details

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

- Definition

Amount of decrease from accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

+ Details

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

- Details

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Namespace Prefix:
Data Type:	na
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- Details

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