Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 30	$ 91
Accounts receivable and unbilled revenues, net	1,117	1,119
Accounts receivable from affiliates	17	25
Derivative assets	57	99
Fuel and gas in storage	235	246
Materials and supplies	113	132
Prepayments and other current assets	281	255
Regulatory assets	248	285
Total Current Assets	2,098	2,252
Property, plant and equipment, at cost	27,320	27,063
Less: accumulated depreciation	(7,158)	(6,986)
Net Property, Plant and Equipment in Service	20,162	20,077
Construction work in progress	1,635	1,471
Total Property, Plant and Equipment ($1,101 and $1,144 related to VIEs, respectively)	21,797	21,548
Equity method investments	384	387
Other investments	57	55
Regulatory assets	3,111	3,091
Other Assets
Goodwill	3,124	3,124
Intangible assets	534	538
Derivative assets	76	73
Other	215	241
Total Other Assets	3,949	3,976
Total Assets	31,396	31,309
Current Liabilities
Current portion of debt	325	349
Tax equity financing arrangements - VIEs	81	96
Notes payable	350	151
Notes payable to affiliates	17	10
Interest accrued	65	60
Accounts payable and accrued liabilities	902	1,096
Accounts payable to affiliates	120	218
Dividends payable	134	134
Taxes accrued	61	52
Derivative liabilities	50	75
Other current liabilities	283	279
Regulatory liabilities	200	192
Total Current Liabilities	2,588	2,712
Regulatory liabilities	1,755	1,753
Deferred income taxes regulatory	574	565
Other Non-current Liabilities
Deferred income taxes	3,068	2,976
Deferred income	1,464	1,483
Pension and other postretirement	1,106	1,106
Tax equity financing arrangements - VIEs	95	103
Derivative liabilities	80	78
Asset retirement obligations	167	161
Environmental remediation costs	386	398
Other	354	342
Total Other Non-current Liabilities	6,720	6,647
Non-current Debt	4,507	4,510
Total Non-current Liabilities	13,556	13,475
Total Liabilities	16,144	16,187
Commitments and Contingencies
Stockholders’ Equity:
Common stock	3	3
Additional paid in capital	13,653	13,653
Treasury Stock	(5)	(5)
Retained earnings	1,649	1,544
Accumulated other comprehensive loss	(61)	(86)
Total Stockholders’ Equity	15,239	15,109
Non-controlling interests	13	13
Total Equity	15,252	15,122
Total Liabilities and Equity	$ 31,396	$ 31,309