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Acquisitions and Dispositions (Schedule of Finite-Lived Intangible Assets Future Amortization Expense) (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]  
2019 $ 67
2020 56
2021 44
2022 34
2023 23
SCANA  
Business Acquisition [Line Items]  
2019 95
2020 90
2021 80
2022 74
2023 $ 71