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Related Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Related Party Transaction [Line Items] |  |  |  |
Derivative assets |  | $ 279 | $ 388 |
Derivative liabilities |  | 155 | 343 |
Capital expenditures |  | 6,085 | 5,575 | $ 5,345
Virginia Electric and Power Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Derivative assets |  | 194 | 127 |
Derivative liabilities |  | 31 | 86 |
Commodity purchases from affiliates |  | 571 | 555 | 543
Services provided by affiliates | [1] | 454 | 422 | 432
Services provided to affiliates |  | 22 | 22 | 22
Capital expenditures |  | 2,489 | 2,474 | 2,911
Virginia Electric and Power Company | Noncurrent Pension and Other Postretirement Benefit Liabilities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amounts due to affiliate |  | 396 | 316 |
Virginia Electric and Power Company | Noncurrent Pension and Other Postretirement Benefit Assets |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amounts due from affiliate |  | 130 | 77 |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Derivative assets |  | 41 | 13 |
Derivative liabilities |  | 8 | 22 |
Virginia Electric and Power Company | Affiliated Entity | Services provided by affiliates |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures |  | 144 | 143 | 146
Virginia Electric and Power Company | Dominion |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Short term demand note borrowings |  | $ 262 | $ 376 |
Weighted- average interest rate percentage |  | 0.97% | 0.60% |
Dominion Gas Holdings, LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Derivative assets |  |  | $ 11 |
Derivative liabilities |  | $ 11 | 14 |
Amounts due from affiliate |  | 1 | 4 |
Services provided by affiliates | [2] | 128 | 101 | 17
Services provided to affiliates |  | 69 | 69 | 84
Capital expenditures |  | 854 | 795 | 719
Purchases of natural gas and transportation and storage services from affiliates |  | 9 | 10 | 34
Customer receivables from related parties | [3] | 10 | 7 |
Affiliated notes receivable | [4] | $ 18 | $ 14 |
Dominion Gas Holdings, LLC | Revolving Credit Facility | IRCA |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Weighted- average interest rate percentage |  | 1.08% | 0.65% |
Borrowings under IRCA |  | $ 118 | $ 95 |
Interest charges |  |  |  | 4
Dominion Gas Holdings, LLC | Services provided by affiliates |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Purchases of natural gas and transportation and storage services from affiliates | [5] | 141 | 133 | 106
Dominion Gas Holdings, LLC | Noncurrent Pension and Other Postretirement Benefit Assets |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amounts due from Dominion |  | 697 | 652 |
Dominion Gas Holdings, LLC | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Imbalances receivable from affiliates |  | 2 | 1 |
Imbalances payable to affiliates | [6] | 4 | 0 |
Dominion Gas Holdings, LLC | Affiliated Entity | Services provided by affiliates |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures |  | $ 49 | $ 57 | $ 49
[1] | Includes capitalized expenditures of $144 million, $143 million and $146 million for the year ended December 31, 2016, 2015, and 2014, respectively.
[2] | Amounts primarily attributable to Atlantic Coast Pipeline.
[3] | Represents amounts due from Atlantic Coast Pipeline, a related party VIE.
[4] | Amounts are presented in other deferred charges and other assets in Dominion Gas' Consolidated Balance Sheets.
[5] | Includes capitalized expenditures of $49 million, $57 million and $49 million for the year ended December 31, 2016, 2015, and 2014, respectively.
[6] | Amounts are presented in other current liabilities in Dominion Gas' Consolidated Balance Sheets.

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