Loan Servicing (Analysis of Activity in Residential MSRs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loan Servicing
Carrying value, beginning balance	$ 1,047us-gaap_ServicingAssetAtFairValueAmount	$ 627us-gaap_ServicingAssetAtFairValueAmount	$ 563us-gaap_ServicingAssetAtFairValueAmount
Additions	141	336	270
Change in fair value due to change in prepayment speeds	(219)bbt_PrepaymentSpeedAssumption	287bbt_PrepaymentSpeedAssumption	19bbt_PrepaymentSpeedAssumption
Change in fair value due to change in weighted average OAS	0bbt_Oas	(31)bbt_Oas	(36)bbt_Oas
Change in fair value due to change in servicing costs	(2)bbt_ServicingCosts	(29)bbt_ServicingCosts	(22)bbt_ServicingCosts
Realization of expected net servicing cash flows and other	(123)	(143)	(167)
Carrying value, ending balance	844us-gaap_ServicingAssetAtFairValueAmount	1,047us-gaap_ServicingAssetAtFairValueAmount	627us-gaap_ServicingAssetAtFairValueAmount
Gains (losses) on derivative financial instruments used to mitigate the income statement effect of changes in fair value	$ 251	$ (197)	$ 128

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Net Increase or Decrease in fair value as a result of changes in the OAS assumption used in the model to calculate the fair value of servicing assets.

+ References

No definition available.

+ Details

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- Definition

The net Increase or Decrease in fair value as a result of changes in the prepayment speed assumption used in the model to calculate the fair value of servicing assets.

+ References

No definition available.

+ Details

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- Definition

The net Increase or Decrease in fair value as a result of changes in the servicing costs assumption used in the model to calculate the fair value of servicing assets.

+ References

No definition available.

+ Details

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- Definition

Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

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- Definition

The net Increase or Decrease in fair value as a result of other changes that are not additions, disposals, or a result of change in the inputs, assumptions, or model used to calculate the fair value of servicing assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(4)(ii)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

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