CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 328	$ 260
Investment in marketable securities	584	960
Accounts receivable, less bad debt reserve	958	1,000
Accrued unbilled revenues	207	427
Natural gas inventory	152	222
Materials and supplies	192	175
Non-trading derivative assets	74	110
Taxes receivable	39	0
Prepaid expenses and other current assets	167	241
Total current assets	2,701	3,395
Property, Plant and Equipment:
Property, plant and equipment	19,585	19,031
Less: accumulated depreciation and amortization	6,188	5,974
Property, plant and equipment, net	13,397	13,057
Other Assets:
Goodwill	867	867
Regulatory assets	2,067	2,347
Non-trading derivative assets	46	44
Investment in unconsolidated affiliate	2,451	2,472
Preferred units – unconsolidated affiliate	363	363
Other	216	191
Total other assets	6,010	6,284
Total Assets	22,108	22,736
Current Liabilities:
Short-term borrowings	0	39
Current portion of VIE Securitization Bonds long-term debt	446	434
Indexed debt, net	26	122
Current portion of other long-term debt	50	50
Indexed debt securities derivative	641	668
Accounts payable	706	963
Taxes accrued	103	181
Interest accrued	118	104
Dividends accrued	0	120
Non-trading derivative liabilities	26	20
Due to ZENS note holders	382	0
Other	344	368
Total current liabilities	2,842	3,069
Other Liabilities:
Deferred income taxes, net	3,168	3,174
Non-trading derivative liabilities	12	4
Benefit obligations	723	785
Regulatory liabilities	2,521	2,464
Other	412	357
Total other liabilities	6,836	6,784
Long-term Debt:
VIE Securitization Bonds, net	1,193	1,434
Other long-term debt, net	6,567	6,761
Total long-term debt, net	7,760	8,195
Commitments and Contingencies (Note 14)
Shareholders’ Equity:
Cumulative preferred stock, $0.01 par value, 20,000,000 shares authorized, none issued or outstanding	0	0
Common stock	4	4
Additional paid-in capital	4,215	4,209
Retained earnings	513	543
Accumulated other comprehensive income (loss)	(62)	(68)
Total shareholders’ equity	4,670	4,688
Total Liabilities and Shareholders’ Equity	22,108	22,736
Houston Electric [Member]
Current Assets:
Cash and cash equivalents	253	238
Accounts and notes receivable	389	284
Accounts and notes receivable–affiliated companies	32	7
Accrued unbilled revenues	122	120
Materials and supplies	125	119
Taxes receivable	23	0
Prepaid expenses and other current assets	59	62
Total current assets	1,003	830
Property, Plant and Equipment:
Property, plant and equipment	11,812	11,496
Less: accumulated depreciation and amortization	3,741	3,633
Property, plant and equipment, net	8,071	7,863
Other Assets:
Regulatory assets	1,321	1,570
Other	35	29
Total other assets	1,356	1,599
Total Assets	10,430	10,292
Current Liabilities:
Current portion of VIE Securitization Bonds long-term debt	446	434
Accounts payable	208	243
Accounts and notes payable–affiliated companies	121	104
Taxes accrued	61	116
Interest accrued	75	65
Other	93	120
Total current liabilities	1,004	1,082
Other Liabilities:
Deferred income taxes, net	1,025	1,059
Benefit obligations	143	146
Regulatory liabilities	1,265	1,263
Other	56	54
Total other liabilities	2,489	2,522
Long-term Debt:
VIE Securitization Bonds, net	1,193	1,434
Other long-term debt, net	3,280	2,885
Total long-term debt, net	4,473	4,319
Commitments and Contingencies (Note 14)
Shareholders’ Equity:
Common stock	0	0
Additional paid-in capital	1,697	1,696
Retained earnings	763	673
Accumulated other comprehensive income (loss)	4	0
Total shareholders’ equity	2,464	2,369
Total Liabilities and Shareholders’ Equity	10,430	10,292
CERC Corp [Member]
Current Assets:
Cash and cash equivalents	1	12
Accounts receivable, less bad debt reserve	566	713
Accounts and notes receivable–affiliated companies	15	6
Accrued unbilled revenues	85	307
Natural gas inventory	152	222
Materials and supplies	67	56
Non-trading derivative assets	74	110
Prepaid expenses and other current assets	80	166
Total current assets	1,040	1,592
Property, Plant and Equipment:
Property, plant and equipment	7,104	6,888
Less: accumulated depreciation and amortization	2,136	2,036
Property, plant and equipment, net	4,968	4,852
Other Assets:
Goodwill	867	867
Regulatory assets	173	181
Non-trading derivative assets	46	44
Investment in unconsolidated affiliate	2,451	2,472
Other	97	104
Total other assets	3,634	3,668
Total Assets	9,642	10,112
Current Liabilities:
Short-term borrowings	0	39
Accounts payable	434	669
Accounts and notes payable–affiliated companies	36	611
Taxes accrued	48	75
Interest accrued	38	32
Customer deposits	75	76
Non-trading derivative liabilities	26	20
Other	152	137
Total current liabilities	809	1,659
Other Liabilities:
Deferred income taxes, net	1,330	1,289
Non-trading derivative liabilities	12	4
Benefit obligations	98	97
Regulatory liabilities	1,256	1,201
Other	352	297
Total other liabilities	3,048	2,888
Long-term Debt:
Total long-term debt, net	2,722	2,457
Commitments and Contingencies (Note 14)
Shareholders’ Equity:
Common stock	0	0
Additional paid-in capital	2,528	2,528
Retained earnings	529	574
Accumulated other comprehensive income (loss)	6	6
Total shareholders’ equity	3,063	3,108
Total Liabilities and Shareholders’ Equity	$ 9,642	$ 10,112