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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenue from contracts $ 2,093 $ 1,385 $ 6,688 $ 4,960
Derivatives income (loss) 664 838 2,508 2,723
Other [1] 6 7 (2) (47)
Revenues 2,742 2,212 9,071 7,553
Houston Electric T&D [Member]        
Disaggregation of Revenue [Line Items]        
Revenues [2] 859 897 2,313 2,502
Indiana Electric Integrated [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 165 0 388 0
Natural Gas Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 515 402 2,554 2,032
Energy Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 734 910 2,754 3,008
Infrastructure Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 376 0 847 0
Corporate and Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 93 3 215 11
Intersegment Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenues (21) (18) (123) (83)
Intersegment Eliminations [Member] | Houston Electric T&D [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Intersegment Eliminations [Member] | Indiana Electric Integrated [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Intersegment Eliminations [Member] | Natural Gas Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenues (9) (8) (29) (26)
Intersegment Eliminations [Member] | Energy Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues (11) (10) (92) (57)
Intersegment Eliminations [Member] | Infrastructure Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues (1) 0 (2) 0
Intersegment Eliminations [Member] | Corporate and Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Reportable Subsegments [Member] | Houston Electric T&D [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts [3] 861 904 2,319 2,525
Derivatives income (loss) [3] 0 0 3 (4)
Other [1],[3] (2) (7) (9) (19)
Revenues [3] 859 897 2,313 2,502
Reportable Subsegments [Member] | Indiana Electric Integrated [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts [3] 165 0 388 [4] 0
Derivatives income (loss) [3] 0 0 0 [4] 0
Other [1],[3] 0 0 0 [4] 0
Revenues [3] 165 0 388 [4] 0
Reportable Subsegments [Member] | Natural Gas Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts [3] 518 398 2,581 [4] 2,093
Derivatives income (loss) [3] 0 0 0 [4],[5] 0
Other [1],[3] 6 12 2 [4] (35)
Revenues [3] 515 402 2,554 [4] 2,032
Reportable Subsegments [Member] | Energy Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts [6] 81 82 341 338
Derivatives income (loss) [6] 664 838 2,505 2,727
Other [1],[6] 0 0 0 0
Revenues [6] 734 910 2,754 3,008
Reportable Subsegments [Member] | Infrastructure Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts [6] 377 0 849 [4] 0
Derivatives income (loss) [6] 0 0 0 [4] 0
Other [1],[6] 0 0 0 [4] 0
Revenues [6] 376 0 847 [4] 0
Reportable Subsegments [Member] | Corporate and Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts [6] 91 1 210 [4] 4
Derivatives income (loss) [6] 0 0 0 [4] 0
Other [1],[6] 2 2 5 [4] 7
Revenues [6] 93 3 215 [4] 11
Reportable Subsegments [Member] | Intersegment Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts [3] (9) (8) (29) [4] (26)
Derivatives income (loss) [6] (11) (10) (92) (57)
Revenues (21) (18) (123) (83)
Reportable Subsegments [Member] | Intersegment Eliminations [Member] | Infrastructure Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts [6] (1)   (2) [4]  
Houston Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 859 897 2,310 2,506
Houston Electric [Member] | Reportable Subsegments [Member] | Houston Electric T&D [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts 861 904 2,319 2,525
Other [7] (2) (7) (9) (19)
Revenues 859 897 2,310 2,506
CERC Corp [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts 477 480 2,446 2,431
Derivatives income (loss) 664 838 2,505 2,727
Other [8] 5 12 5 (35)
Revenues 1,126 1,312 4,836 5,040
CERC Corp [Member] | Natural Gas Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 389 402 2,077 2,032
CERC Corp [Member] | Energy Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 734 910 2,755 3,008
CERC Corp [Member] | Corporate and Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 3 0 4 0
CERC Corp [Member] | Intersegment Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenues (20) (18) (120) (83)
CERC Corp [Member] | Intersegment Eliminations [Member] | Natural Gas Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenues (9) (8) (29) (26)
CERC Corp [Member] | Intersegment Eliminations [Member] | Energy Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues (11) (10) (91) (57)
CERC Corp [Member] | Intersegment Eliminations [Member] | Corporate and Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
CERC Corp [Member] | Reportable Subsegments [Member] | Natural Gas Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts [5] 393 398 2,101 2,093
Derivatives income (loss)   0 [5]   0
Other [5],[8] 5 12 5 (35)
Revenues [5] 389 402 2,077 2,032
CERC Corp [Member] | Reportable Subsegments [Member] | Energy Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts [9] 81 82 341 338
Derivatives income (loss) [9] 664 838 2,505 2,727
Other [8],[9] 0 0 0 0
Revenues [9] 734 910 2,755 3,008
CERC Corp [Member] | Reportable Subsegments [Member] | Corporate and Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts [9] 3 0 4 0
Derivatives income (loss) [9]   0 0 0
Other [8],[9] 0 0 0 0
Revenues [9] 3 0 4 0
CERC Corp [Member] | Reportable Subsegments [Member] | Intersegment Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts [5] (9) (8) (29) (26)
Derivatives income (loss) [9] (11) (10) (91) (57)
Revenues $ (20) $ (18) $ (120) $ (83)
[1]
Primarily consists of income from ARPs and leases. ARPs are contracts between the utility and its regulators, not between the utility and a customer. The Registrants recognize ARP revenue as other revenues when the regulator-specified conditions for recognition have been met. Upon recovery of ARP revenue through incorporation in rates charged for utility service to customers, ARP revenue is reversed and recorded as revenue from contracts with customers. The recognition of ARP revenues and the reversal of ARP revenues upon recovery through rates charged for utility service may not occur in the same period.
[2]
Houston Electric T&D revenues from major external customers are as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2019
 
2018
 
2019
 
2018
 
 
(in millions)
Affiliates of NRG
 
$
231

 
$
213

 
$
547

 
$
543

Affiliates of Vistra Energy Corp.
 
83

 
79

 
196

 
192
[3] Reflected in Utility revenues in the Condensed Statements of Consolidated Income
[4]
Reflects revenues from Vectren subsidiaries for the period from February 1, 2019 to September 30, 2019.
[5]
Reflected in Utility revenues in the Condensed Statements of Consolidated Income.
[6]
Reflected in Non-utility revenues in the Condensed Statements of Consolidated Income.
[7]
Primarily consists of income from ARPs and leases. ARPs are contracts between the utility and its regulators, not between the utility and a customer. The Registrants recognize ARP revenue as other revenues when the regulator-specified conditions for recognition have been met. Upon recovery of ARP revenue through incorporation in rates charged for utility service to customers, ARP revenue is reversed and recorded as revenue from contracts with customers. The recognition of ARP revenues and the reversal of ARP revenues upon recovery through rates charged for utility service may not occur in the same period.
[8]
Primarily consists of income from ARPs and leases. ARPs are contracts between the utility and its regulators, not between the utility and a customer. The Registrants recognize ARP revenue as other revenues when the regulator-specified conditions for recognition have been met. Upon recovery of ARP revenue through incorporation in rates charged for utility service to customers, ARP revenue is reversed and recorded as revenue from contracts with customers. The recognition of ARP revenues and the reversal of ARP revenues upon recovery through rates charged for utility service may not occur in the same period.
[9]
Reflected in Non-utility revenues in the Condensed Statements of Consolidated Income.