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Acquisitions and Dispositions (Schedule of Property Plant and Equipment) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Utility: |  |  |
Generation | $ 19,250 | $ 17,602 |
Transmission | 16,669 | 15,335 |
Distribution | 18,549 | 17,408 |
Storage | 2,905 | 2,887 |
Nuclear fuel | 1,626 | 1,599 |
General and other | 1,476 | 1,514 |
Plant under construction | 2,385 | 7,765 |
Total utility | 64,930 | 66,049 |
Total property, plant and equipment | $ 76,578 | $ 74,823 |
Generation |  |  |
Utility: |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | 2.71% | 2.94% | 2.83%
Transmission |  |  |
Utility: |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | 2.54% | 2.55% | 2.47%
Distribution |  |  |
Utility: |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | 2.97% | 3.00% | 3.02%
Storage |  |  |
Utility: |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | 2.40% | 2.48% | 2.29%
General and Other |  |  |
Utility: |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | 4.56% | 4.89% | 4.12%
SCANA |  |  |
Utility: |  |  |
Generation | $ 5,720 |  |
Transmission | 2,416 |  |
Distribution | 6,044 |  |
Storage | 99 |  |
Nuclear fuel | 611 |  |
General and other | 631 |  |
Plant under construction | 527 |  |
Total utility | 16,048 |  |
Nonutility, including plant under construction | 283 |  |
Total property, plant and equipment | $ 16,331 |  |
SCANA | Generation |  |  |
Utility: |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | 2.61% |  |
SCANA | Transmission |  |  |
Utility: |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | 2.47% |  |
SCANA | Distribution |  |  |
Utility: |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | 2.48% |  |
SCANA | Storage |  |  |
Utility: |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | 2.48% |  |
SCANA | General and Other |  |  |
Utility: |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | 5.64% |  |

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