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Acquisitions and Dispositions (Proposed Acquisition Of Scana) (Narrative) (Detail) - Subsequent Event $ in Millions | 1 Months Ended
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Jan. 31, 2018 USD ($) shares
Business Acquisition [Line Items] |
Contract termination fee | $ 280
SCANA [Member] |
Business Acquisition [Line Items] |
Common stock agreed to issue | shares | 0.6690
Business combination, liability incurred | $ 575
Combination debt outstanding | 7,000
Contract termination fee | $ 240
SCANA [Member] | Minimum |
Business Acquisition [Line Items] |
Discount on existing customers | 5.00%
SCANA [Member] | Up-front Payment Arrangement [Member] |
Business Acquisition [Line Items] |
Business combination, liability incurred | $ 1,300
V.C. Summer Units [Member] |
Business Acquisition [Line Items] |
Business combination cost related to exclusion from rate recovery | 1,700
Columbia energy. |
Business Acquisition [Line Items] |
Business combination cost related to exclusion from rate recovery | $ 180

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