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Income Taxes (Schedule of Deferred Income Taxes) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Contingency [Line Items] |  |
Total deferred income tax assets | $ 1,827 | $ 1,152
Total deferred income tax liabilities | 10,381 | 8,552
Total net deferred income tax liabilities | 8,554 | 7,400
Total deferred income taxes: |  |
Plant and equipment, primarily depreciation method and basis differences | 7,782 | 6,299
Nuclear decommissioning | 1,240 | 1,158
Deferred state income taxes | 747 | 646
Federal benefit of deferred state income taxes | (261) | (226)
Deferred fuel, purchased energy and gas costs | (25) | (1)
Pension benefits | 155 | 291
Other postretirement benefits | (68) | (15)
Loss and credit carryforwards | (1,547) | (1,004)
Valuation allowances | 135 | 73
Partnership basis differences | 688 | 367
Other | (292) | (188)
Total net deferred income tax liabilities | 8,554 | 7,400
Deferred investment tax credits - regulated operations | 48 | 14
Total deferred taxes and deferred investment tax credits | 8,602 | 7,414
Virginia Electric and Power Company |  |
Income Tax Contingency [Line Items] |  |
Total deferred income tax assets | 268 | 164
Total deferred income tax liabilities | 5,323 | 4,805
Total net deferred income tax liabilities | 5,055 | 4,641
Total deferred income taxes: |  |
Plant and equipment, primarily depreciation method and basis differences | 4,604 | 4,133
Nuclear decommissioning | 406 | 378
Deferred state income taxes | 321 | 302
Federal benefit of deferred state income taxes | (112) | (106)
Deferred fuel, purchased energy and gas costs | (29) | (3)
Pension benefits | (138) | (99)
Other postretirement benefits | 49 | 30
Loss and credit carryforwards | (88) | (53)
Valuation allowances | 3 | 0
Partnership basis differences | 0 | 0
Other | 39 | 59
Total net deferred income tax liabilities | 5,055 | 4,641
Deferred investment tax credits - regulated operations | 48 | 13
Total deferred taxes and deferred investment tax credits | 5,103 | 4,654
Dominion Gas Holdings, LLC |  |
Income Tax Contingency [Line Items] |  |
Total deferred income tax assets | 126 | 129
Total deferred income tax liabilities | 2,564 | 2,343
Total net deferred income tax liabilities | 2,438 | 2,214
Total deferred income taxes: |  |
Plant and equipment, primarily depreciation method and basis differences | 1,726 | 1,541
Nuclear decommissioning | 0 | 0
Deferred state income taxes | 204 | 205
Federal benefit of deferred state income taxes | (71) | (72)
Deferred fuel, purchased energy and gas costs | 4 | 1
Pension benefits | 646 | 613
Other postretirement benefits | (6) | (7)
Loss and credit carryforwards | (5) | (4)
Valuation allowances | 0 | 0
Partnership basis differences | 43 | 41
Other | (103) | (104)
Total net deferred income tax liabilities | 2,438 | 2,214
Deferred investment tax credits - regulated operations | 0 | 0
Total deferred taxes and deferred investment tax credits | $ 2,438 | $ 2,214

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