Long-Term Debt - Schedule of Long Term Debt, Interest Rates and Maturity Dates (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 23,648	$ 21,965
Other long-term debt
Debt Instrument [Line Items]
Other long-term debt	205	152
BB&T Corporation:
Debt Instrument [Line Items]
Long-term debt	$ 12,042	10,836
BB&T Corporation: \| Senior Notes \| Fixed rate
Debt Instrument [Line Items]
Effective Rate	2.89%
Long-term debt	$ 8,562	7,600
BB&T Corporation: \| Senior Notes \| Fixed rate \| Min
Debt Instrument [Line Items]
Stated Rate	2.05%
BB&T Corporation: \| Senior Notes \| Fixed rate \| Max
Debt Instrument [Line Items]
Stated Rate	6.85%
BB&T Corporation: \| Senior Notes \| Floating rate
Debt Instrument [Line Items]
Effective Rate	2.13%
Long-term debt	$ 2,547	1,898
BB&T Corporation: \| Senior Notes \| Floating rate \| Min
Debt Instrument [Line Items]
Stated Rate	1.60%
BB&T Corporation: \| Senior Notes \| Floating rate \| Max
Debt Instrument [Line Items]
Stated Rate	2.45%
BB&T Corporation: \| Subordinated Notes \| Fixed rate
Debt Instrument [Line Items]
Effective Rate	1.98%
Long-term debt	$ 933	1,338
BB&T Corporation: \| Subordinated Notes \| Fixed rate \| Min
Debt Instrument [Line Items]
Stated Rate	3.95%
BB&T Corporation: \| Subordinated Notes \| Fixed rate \| Max
Debt Instrument [Line Items]
Stated Rate	5.25%
Branch Bank \| Senior Notes \| Fixed rate
Debt Instrument [Line Items]
Effective Rate	2.56%
Long-term debt	$ 5,653	4,209
Branch Bank \| Senior Notes \| Fixed rate \| Min
Debt Instrument [Line Items]
Stated Rate	1.45%
Branch Bank \| Senior Notes \| Fixed rate \| Max
Debt Instrument [Line Items]
Stated Rate	2.85%
Branch Bank \| Senior Notes \| Floating rate
Debt Instrument [Line Items]
Effective Rate	2.10%
Long-term debt	$ 1,149	250
Branch Bank \| Senior Notes \| Floating rate \| Min
Debt Instrument [Line Items]
Stated Rate	1.74%
Branch Bank \| Senior Notes \| Floating rate \| Max
Debt Instrument [Line Items]
Stated Rate	1.91%
Branch Bank \| Subordinated Notes \| Fixed rate
Debt Instrument [Line Items]
Effective Rate	3.58%
Long-term debt	$ 2,119	2,138
Branch Bank \| Subordinated Notes \| Fixed rate \| Min
Debt Instrument [Line Items]
Stated Rate	3.63%
Branch Bank \| Subordinated Notes \| Fixed rate \| Max
Debt Instrument [Line Items]
Stated Rate	3.80%
Branch Bank \| Subordinated Notes \| Floating rate
Debt Instrument [Line Items]
Long-term debt	$ 0	262
Branch Bank \| FHLB Advances
Debt Instrument [Line Items]
Effective Rate	1.49%
Long-term debt	$ 2,480	$ 4,118
Weighted average maturity of FHLB advances	3 years 9 months 18 days
Branch Bank \| FHLB Advances \| Min
Debt Instrument [Line Items]
Stated Rate	0.00%
Branch Bank \| FHLB Advances \| Max
Debt Instrument [Line Items]
Stated Rate	5.50%

Weighted average maturity of FHLB advances

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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Contractual interest rate for funds borrowed, under the debt agreement.

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- 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.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of long-term debt classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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