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Leases (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Lease, Cost [Abstract]        
Operating lease cost $ 7 $ 11    
Short-term lease cost 18 23    
Total lease cost 25 34    
Assets and Liabilities, Lessee [Abstract]        
Operating ROU assets (1) [1] 72 72    
Lease Right-Of-Use Asset 72 72 $ 30  
Current operating lease liability (2) [2] 22 22    
Non-current operating lease liability (3) [3] $ 50 $ 50    
Weighted-average remaining lease term (in years) - operating leases 5 years 2 months 12 days 5 years 2 months 12 days    
Weighted-average discount rate - operating leases 3.41% 3.41%    
Operating Lease Liabilities, Payments Due [Abstract]        
Remaining six months of 2019 $ 14 $ 14    
2020 21 21    
2021 15 15    
2022 8 8    
2023 7 7    
2024 3 3    
2025 and beyond 12 12    
Total lease payments 80 80    
Less: Interest 8 8    
Present value of lease liabilities 72 72    
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Operating Leases, Future Minimum Payments Due, Next Twelve Months       $ 6
Operating Leases, Future Minimum Payments, Due in Two Years       6
Operating Leases, Future Minimum Payments, Due in Three Years       5
Operating Leases, Future Minimum Payments, Due in Four Years       4
Operating Leases, Future Minimum Payments, Due in Five Years       3
Operating Leases, Future Minimum Payments, Due Thereafter       12
Operating Leases, Future Minimum Payments Due [4]       36
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]        
Lessor, Operating Lease, Payments to be Received, Remainder of Fiscal Year 2 2    
Lessor, Operating Lease, Payments to be Received, Next Twelve Months 2 2    
Lessor, Operating Lease, Payments to be Received, Two Years 2 2    
Lessor, Operating Lease, Payments to be Received, Three Years 2 2    
Lessor, Operating Lease, Payments to be Received, Four Years 2 2    
Lessor, Operating Lease, Payments to be Received, Five Years 2 2    
Lessor, Operating Lease, Payments to be Received, Thereafter 10 10    
Lessor, Operating Lease, Payments to be Received 22 22    
Other Information Related to Leases [Abstract]        
Operating Lease, Payments 7 12    
Houston Electric [Member]        
Lease, Cost [Abstract]        
Operating lease cost 0 0    
Short-term lease cost 3 5    
Total lease cost 3 5    
Assets and Liabilities, Lessee [Abstract]        
Operating ROU assets (1) [1] 1 1    
Lease Right-Of-Use Asset 1 1 1  
Current operating lease liability (2) [2] 0 0    
Non-current operating lease liability (3) [3] $ 1 $ 1    
Weighted-average remaining lease term (in years) - operating leases 5 years 6 months 5 years 6 months    
Weighted-average discount rate - operating leases 3.51% 3.51%    
Operating Lease Liabilities, Payments Due [Abstract]        
Remaining six months of 2019 $ 0 $ 0    
2020 1 1    
2021 0 0    
2022 0 0    
2023 0 0    
2024 0 0    
2025 and beyond 0 0    
Total lease payments 1 1    
Less: Interest 0 0    
Present value of lease liabilities 1 1    
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Operating Leases, Future Minimum Payments Due, Next Twelve Months       1
Operating Leases, Future Minimum Payments, Due in Two Years       0
Operating Leases, Future Minimum Payments, Due in Three Years       0
Operating Leases, Future Minimum Payments, Due in Four Years       0
Operating Leases, Future Minimum Payments, Due in Five Years       0
Operating Leases, Future Minimum Payments, Due Thereafter       0
Operating Leases, Future Minimum Payments Due [4]       1
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]        
Lessor, Operating Lease, Payments to be Received, Remainder of Fiscal Year 0 0    
Lessor, Operating Lease, Payments to be Received, Next Twelve Months 1 1    
Lessor, Operating Lease, Payments to be Received, Two Years 0 0    
Lessor, Operating Lease, Payments to be Received, Three Years 0 0    
Lessor, Operating Lease, Payments to be Received, Four Years 0 0    
Lessor, Operating Lease, Payments to be Received, Five Years 0 0    
Lessor, Operating Lease, Payments to be Received, Thereafter 0 0    
Lessor, Operating Lease, Payments to be Received 1 1    
Other Information Related to Leases [Abstract]        
Operating Lease, Payments 0 1    
CERC Corp [Member]        
Lease, Cost [Abstract]        
Operating lease cost 2 3    
Short-term lease cost 0 0    
Total lease cost 2 3    
Assets and Liabilities, Lessee [Abstract]        
Operating ROU assets (1) [1] 26 26    
Lease Right-Of-Use Asset 26 26 $ 27  
Current operating lease liability (2) [2] 5 5    
Non-current operating lease liability (3) [3] $ 21 $ 21    
Weighted-average remaining lease term (in years) - operating leases 8 years 1 month 6 days 8 years 1 month 6 days    
Weighted-average discount rate - operating leases 3.67% 3.67%    
Operating Lease Liabilities, Payments Due [Abstract]        
Remaining six months of 2019 $ 3 $ 3    
2020 5 5    
2021 4 4    
2022 4 4    
2023 3 3    
2024 2 2    
2025 and beyond 9 9    
Total lease payments 30 30    
Less: Interest 4 4    
Present value of lease liabilities 26 26    
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Operating Leases, Future Minimum Payments Due, Next Twelve Months       5
Operating Leases, Future Minimum Payments, Due in Two Years       5
Operating Leases, Future Minimum Payments, Due in Three Years       4
Operating Leases, Future Minimum Payments, Due in Four Years       4
Operating Leases, Future Minimum Payments, Due in Five Years       3
Operating Leases, Future Minimum Payments, Due Thereafter       11
Operating Leases, Future Minimum Payments Due [4]       $ 32
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]        
Lessor, Operating Lease, Payments to be Received, Remainder of Fiscal Year 0 0    
Lessor, Operating Lease, Payments to be Received, Next Twelve Months 0 0    
Lessor, Operating Lease, Payments to be Received, Two Years 0 0    
Lessor, Operating Lease, Payments to be Received, Three Years 0 0    
Lessor, Operating Lease, Payments to be Received, Four Years 0 0    
Lessor, Operating Lease, Payments to be Received, Five Years 0 0    
Lessor, Operating Lease, Payments to be Received, Thereafter 0 0    
Lessor, Operating Lease, Payments to be Received 0 0    
Other Information Related to Leases [Abstract]        
Operating Lease, Payments $ 1 $ 2    
[1]
Reported within Other assets in the Condensed Consolidated Balance Sheets.

[2]
Reported within Current other liabilities in the Condensed Consolidated Balance Sheets.

[3]
Reported within Other liabilities in the Condensed Consolidated Balance Sheets.

[4]
The Merger was completed on February 1, 2019. As such, these amounts are exclusive of Vectren’s leases.