Schedule I - Condensed Financial Information Of Parent (Schedule Of Condensed Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash and cash equivalents	$ 449	$ 177	$ 123	$ 151
Advances to affiliates	22	22
Income taxes receivable	0	160
Other Assets, Current	464	290
Total current assets	6,281	6,164
Equipment	77,248	72,595
Accumulated depreciation	(23,459)	(22,014)
Net property, plant, and equipment	53,789	50,581
Income taxes receivable	65	70
Other	1,221	1,226
TOTAL ASSETS	68,012	68,598
Short-term borrowings	931	1,516
Long-term debt, classified as current	445	700
Other	2,010	2,323
Total current liabilities	7,129	7,564
Long-term debt	17,753	16,220
Other	2,130	2,279
Total noncurrent liabilities	41,411	42,842
Common stock	12,632	12,198
Reinvested earnings	6,596	5,751
Accumulated other comprehensive income (loss)	(8)	(9)
Total shareholders' equity	19,220	17,940
TOTAL LIABILITIES AND EQUITY	68,012	68,598
PG&E Corporation [Member]
Cash and cash equivalents	2	106	$ 64	$ 96
Advances to affiliates	24	24
Income taxes receivable	27	25
Total current assets	53	155
Equipment	3	2
Accumulated depreciation	(3)	(2)
Net property, plant, and equipment	0	0
Investments in subsidiaries	19,514	18,172
Other investments	144	133
Intercompany receivable	72	0
Deferred income taxes	123	267
Total noncurrent assets	19,853	18,572
TOTAL ASSETS	19,906	18,727
Short-term borrowings	132	0
Accounts payable - other	6	7
Other	23	274
Total current liabilities	161	281
Long-term debt	350	348
Other	175	158
Total noncurrent liabilities	525	506
Common stock	12,632	12,198
Reinvested earnings	6,596	5,751
Accumulated other comprehensive income (loss)	(8)	(9)
Total shareholders' equity	19,220	17,940
TOTAL LIABILITIES AND EQUITY	$ 19,906	$ 18,727