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Acquisitions and Dispositions (Schedule of Preliminary Allocation of Purchase Price to Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 16, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |
Goodwill | [1] |  | $ 6,399 | $ 3,294 | $ 3,044
Dominion Questar Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Decrease to goodwill related modifications to preliminary valuation amounts |  |  | $ 6 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |
Total current assets |  | $ 224 |  |  |
Investments | [2] | 58 |  |  |
Property, plant and equipment | [3] | 4,131 |  |  |
Goodwill |  | 3,105 |  |  |
Total deferred charges and other assets, excluding goodwill |  | 75 |  |  |
Total Assets |  | 7,593 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |
Total current liabilities | [4] | 793 |  |  |
Long-term debt | [5] | 963 |  |  |
Deferred income taxes |  | 801 |  |  |
Regulatory liabilities |  | 259 |  |  |
Asset retirement obligations |  | 160 |  |  |
Other deferred credits and other liabilities |  | 220 |  |  |
Total Liabilities |  | 3,196 |  |  |
Total estimated purchase price |  | 4,397 |  |  |
Short-term debt |  | 301 |  |  |
Dominion Questar Corporation | Short Term Note, Variable Rate, Maturing in February 2017 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |
Short-term note outstanding |  | $ 250 |  |  |
Dominion Questar Corporation | Minimum |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |
Estimated Useful Lives |  | 9 years |  |  |
Dominion Questar Corporation | Minimum | Unsecured Senior Notes, Maturities Range from 2017 to 2048 | Unsecured Senior Notes |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |
Interest rate (percentage) |  | 2.98% |  |  |
Dominion Questar Corporation | Maximum |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |
Estimated Useful Lives |  | 18 years |  |  |
Dominion Questar Corporation | Maximum | Unsecured Senior Notes, Maturities Range from 2017 to 2048 | Unsecured Senior Notes |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |
Interest rate (percentage) |  | 7.20% |  |  |
Dominion Questar Corporation | White River Hub, LLC |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |
Equity method investment |  | $ 40 |  |  |
[1] | Goodwill amounts do not contain any accumulated impairment losses.
[2] | Includes $40 million for an equity method investment in White River Hub. The fair value adjustment on the equity method investment in White River Hub is considered to be equity method goodwill and is not amortized.
[3] | Nonregulated property, plant and equipment, excluding land, will be depreciated over remaining useful lives primarily ranging from 9 to 18 years.
[4] | Includes $301 million of short-term debt, of which no amounts remain outstanding at December 31, 2016, as well as a $250 million term loan which matures in August 2017 and bears interest at a variable rate.
[5] | Unsecured senior and medium-term notes have maturities which range from 2017 to 2048 and bear interest at rates from 2.98% to 7.20%.

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