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Acquisitions and Dispositions (Acquisitions Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 03, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Integration Related Costs |  | $ 31 | $ 16 | $ 20 | $ 17 | $ 34 | $ 23 | $ 30 | $ 16 | $ 84 | $ 103 |
Asset Impairment Charges |  |  |  |  |  |  |  |  |  | 402 | 282 | $ 18
Net Income (Loss) Attributable to Parent |  | $ 464 | $ 1,082 | $ 500 | $ 620 | $ 703 | $ 954 | $ 686 | $ 716 | 2,666 | 3,059 | 2,152
Piedmont Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 5,000 |  |  |  |  |  |  |  |  |  |  |
Long-term debt assumed | $ 2,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Integration Related Costs |  |  |  |  |  |  |  |  |  | 84 | 103 | 439
Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  | 7 |
Business Combination, After Tax Integration Related Costs |  |  |  |  |  |  |  |  |  |  |  | 279
Revenues |  |  |  |  |  |  |  |  |  |  |  | 367
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  | 20
Interest Rate Contract [Member] | Piedmont Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on Interest Rate Derivative Instruments Not Designated as Hedging Instruments |  |  |  |  |  |  |  |  |  |  |  | 190
Sales [Member] | Piedmont Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Integration Related Costs |  |  |  |  |  |  |  |  |  |  |  | 10
Operating Expense [Member] | Piedmont Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Integration Related Costs |  |  |  |  |  |  |  |  |  |  | 64 | 101
Operating Income (Loss) [Member] | Piedmont Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Integration Related Costs |  |  |  |  |  |  |  |  |  |  |  | 46
Interest Expense [Member] | Piedmont Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Integration Related Costs |  |  |  |  |  |  |  |  |  |  |  | 234
Other Expense [Member] | Piedmont Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Integration Related Costs |  |  |  |  |  |  |  |  |  |  |  | 104
Other Expense [Member] | Operating Expense [Member] | Piedmont Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Integration Related Costs |  |  |  |  |  |  |  |  |  |  |  | 94
Other Expense [Member] | Operating Income (Loss) [Member] | Piedmont Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Integration Related Costs |  |  |  |  |  |  |  |  |  |  |  | $ 10
System Integration Costs [Member] | Piedmont Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Integration Related Costs |  |  |  |  |  |  |  |  |  | $ 78 | $ 71 |

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