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Commitments and Contingencies (Guarantees, Surety Bonds and Letters of Credit) (Narrative) (Details) $ in Millions | Dec. 31, 2016 USD ($)
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Guarantor Obligations [Line Items] |  |
Purchased surety bonds | $ 149 |
Authorized issuance of standby letters of credit | 85 |
Exposure under guarantees | 5,818 | [1]
Virginia Electric and Power Company |  |
Guarantor Obligations [Line Items] |  |
Purchased surety bonds | 71 |
Virginia Electric and Power Company | Debt |  |
Guarantor Obligations [Line Items] |  |
Exposure under guarantees | 14 |
Dominion Gas Holdings, LLC |  |
Guarantor Obligations [Line Items] |  |
Purchased surety bonds | 22 |
Third Party and Equity Method Investee |  |
Guarantor Obligations [Line Items] |  |
Estimate of possible loss | $ 48 |
[1] | Excludes Dominion's guarantee for the construction of the new corporate office property discussed further within Lease Commitments above.

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