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Long-Term Debt (Narrative) (Detail) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2024 | Aug. 15, 2016 | Aug. 31, 2019 | Jul. 31, 2017 | Jul. 31, 2016 | Apr. 30, 2016 | Oct. 31, 2014 | Sep. 30, 2011 | Sep. 30, 2006 | Jun. 30, 2006 | Dec. 31, 2018 | May 31, 2017 | Aug. 31, 2016 | Jun. 29, 2016 | May 31, 2016 | Mar. 31, 2016 | Jul. 31, 2014 | Jun. 30, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate outstanding principal of senior notes |  |  |  |  |  |  |  |  |  |  |  | $ 2,200,000,000 |  |  |  |  |  |  |
Aggregate redemption price paid |  |  |  |  |  |  |  |  |  |  |  | 2,200,000,000 |  |  |  |  |  |  |
Make-whole premium |  |  |  |  |  |  |  |  |  |  |  | $ 34,000,000 |  |  |  |  |  |  |
Period of deferral |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Period for consideration of proceeds (days) |  |  |  |  |  |  |  |  | 180 days |  |  | 365 days |  |  |  |  |  |  |
Interest in RSN issued by Dominion (percentage) |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price to be paid under stock purchase contracts (in dollars per unit) |  |  |  |  |  |  |  |  |  |  |  | $ 50 |  |  |  |  |  |  |
Shares reserved and available for issuance |  |  |  |  |  |  |  |  |  |  |  | 23,100,000 |  |  |  |  |  |  |
Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000,000 |  |  |  |  |
Payment percentage rate on Equity Units |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.75% |  |  |  | 6.375% | 6.125%
Purchase price to be paid under stock purchase contracts (in dollars per unit) |  |  |  |  |  |  |  |  |  |  |  | $ 50 |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 28,000,000 | [1] |  | 12,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit, Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment percentage rate on Equity Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00%
Scenario, Forecast | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to be issued under purchase contracts |  |  |  | 18,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to be issued under purchase contracts |  |  |  | 15,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Redemptions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | $ 69,000,000 |  |  |  |  |  |  |
Senior Note Redemptions [Member] | Series A 4.45% Senior Notes Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  | 4.45% |  |  |  |  |  |  |
Senior Note Redemptions [Member] | Series B 2.50% Senior Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |
Senior Note Redemptions [Member] | Series C 3.625% Senior Notes Due 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  | 3.625% |  |  |  |  |  |  |
June 2006 and September 2006 hybrids | Unsecured Junior Subordinated Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount purchased and cancelled |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
July 2016 Hybrids | Unsecured Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  | 5.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  | $ 800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Remarketable Subordinated Notes | Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  | 2.00% | [1],[2] |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  | 1.07% |  |
Principal amount of notes |  | $ 1,400,000,000 | [1] |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  | $ 550,000,000 | $ 1,000,000,000 | $ 550,000,000
Issuance of common stock (in shares) |  |  |  |  | 12,500,000 | 8,500,000 | 8,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Remarketable Subordinated Notes | Capital Unit, Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.18% |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 550,000,000 |  |  | $ 550,000,000
Series A Junior Subordinated Notes | Unsecured Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  | 2.579% |  |  |  | 4.104% |  |
Series B Junior Subordinated Notes | Unsecured Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.962% |  |  |
Remarketable Subordinated Notes, 2016 Series A-1, due August 15, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in RSN issued by Dominion (percentage) |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |
Remarketable Subordinated Notes, 2016 Series A-1, due August 15, 2021 | Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  | 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remarketable Subordinated Notes, 2016 Series A-2, due August 15, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in RSN issued by Dominion (percentage) |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |
Remarketable Subordinated Notes, 2016 Series A-2, due August 15, 2024 | Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
June 2006 hybrids |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate redemption price paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,000,000 |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50% |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |
June 2006 hybrids | Unsecured Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount purchased and cancelled |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
June 2006 hybrids | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable percentage rate |  |  |  |  |  |  |  |  |  |  | 2.825% |  |  |  |  |  |  |  |
September 2006 hybrids |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate redemption price paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000 |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
September 2006 hybrids | Unsecured Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount purchased and cancelled |  |  |  |  |  | $ 74,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
September 2006 hybrids | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable percentage rate |  |  |  |  |  |  |  |  |  | 2.30% |  |  |  |  |  |  |  |  |
October 2014 Hybrids [Member] | Unsecured Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  | $ 685,000,000 |  |  |  |  |  |  |  |  |  |  |
October 2014 Hybrids [Member] | LIBOR [Member] | Unsecured Junior Subordinated Notes | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable percentage rate | 3.057% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The maturity dates of the $700 million Series A-1 RSNs and $700 million Series A-2 RSNs are August 15, 2021 and August 15, 2024, respectively.
[2] | Annual interest rate applies to each of the Series A-1 RSNs and Series A-2 RSNs.

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