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Organization and Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Allocation of losses to noncontrolling interest	$ (19)	$ (16)	$ (110)	$ (12)
North Rosamond Solar Farm [Member]
Noncontrolling Interest [Line Items]
Allocation of losses to noncontrolling interest	12		86
Current Assets, Other [Member] \| Piedmont Natural Gas [Member]
Noncontrolling Interest [Line Items]
Income taxes receivable	90		90		$ 11
Prepaid assets	$ 30		$ 30		$ 5