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Employee Benefit Plans (AOCI and regulatory assets and liabilities that have not been recognized as components of periodic benefit (credit) cost) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss |  | $ (799) | $ (474)
Dominion Gas Holdings, LLC |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss |  | (123) | (99)
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss |  | 3,200 | 2,381
Prior service (credit) cost |  | 4 | 5
Total | [1] | 3,204 | 2,386
Amount included in AOCI |  | 1,900 | 1,400
Pension Benefits | Dominion Gas Holdings, LLC |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss |  | 458 | 380
Prior service (credit) cost |  | 0 | 1
Total | [2] | 458 | 381
Amount included in AOCI |  | 167 | 138
Other Postretirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss |  | 283 | 114
Prior service (credit) cost |  | (419) | (237)
Total | [1] | (136) | (123)
Amount included in AOCI |  | (103) | (90)
Other Postretirement Plans | Dominion Gas Holdings, LLC |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss |  | 60 | 33
Prior service (credit) cost |  | 7 | 7
Total | [2] | $ 67 | $ 40
[1] | As of December 31, 2016, of the $3.2 billion and $(136) million related to pension benefits and other postretirement benefits, $1.9 billion and $(103) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities. As of December 31, 2015, of the $2.4 billion and $(123) million related to pension benefits and other postretirement benefits, $1.4 billion and $(90) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities.
[2] | As of December 31, 2016, of the $458 million related to pension benefits, $167 million is included in AOCI, with the remainder included in regulatory assets and liabilities; the $67 million related to other postretirement benefits is included entirely in regulatory assets and liabilities. As of December 31, 2015, of the $381 million related to pension benefits, $138 million is included in AOCI, with the remainder included in regulatory assets and liabilities; the $40 million related to other postretirement benefits is included entirely in regulatory assets and liabilities.

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