CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Revenues:
Electric Regulated Revenue	$ (480,000,000)	$ 547,000,000
Electric Domestic Regulated Revenues - Affiliate	1,100	1,200,000
Regulated Operating Revenue, Gas	145,000,000	155,000,000
Regulated Operating Revenue	(335,000,000)	702,000,000
Operating Expenses
Fuel used in electric generation	137,000,000	159,000,000
Fuel used in electric generation, affiliate	33,200	31,300,000
Purchased power	8,000,000	52,000,000
Utilities Operating Expense, Gas and Petroleum Purchased	77,000,000	75,000,000
Other operation and maintenance	105,000,000	102,000,000
Other operation and maintenance, affiliate	48,000,000	44,000,000
Utilities Operating Expense, Impairments	262,000,000	4,000,000
Depreciation and amortization	102,000,000	80,000,000
Other taxes	69,000,000	65,000,000
Total Operating Expenses	808,000,000	581,000,000
Operating Income	(1,143,000,000)	121,000,000
Other Nonoperating Income (Expense)	(5,000,000)	123,000,000
Other Income (Expense):
Other income	4,000,000	126,000,000
Other expense	(10,000,000)	(7,000,000)
Interest Expense	(73,000,000)	(77,000,000)
Income Before Income Tax Expense	(1,221,000,000)	167,000,000
Income Tax Expense	(118,000,000)	39,000,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(1,103,000,000)	128,000,000
Net Income (Loss) Attributable to Noncontrolling Interest	6,000,000	4,000,000
Earnings Available to Common Shareholder	$ (1,109,000,000)	$ 124,000,000