Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details) $ in Millions	Mar. 31, 2020 USD ($) $ / MMBTU $ / MWh	Dec. 31, 2019 USD ($) $ / MMBTU $ / MWh
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	$ 781	$ 775
Derivative Liabilities	(746)	(770)
Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	172	160
Derivative Liabilities	(148)	(156)
Natural gas
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	282	355
Derivative Liabilities	(278)	(351)
Natural gas \| Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	72	74
Derivative Liabilities	(64)	(89)
Electricity
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	313	306
Derivative Liabilities	(317)	(298)
Electricity \| Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	99	83
Derivative Liabilities	$ (84)	$ (67)
Forward basis price \| Natural gas \| Minimum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	(0.84)	(1.78)
Forward basis price \| Natural gas \| Maximum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	4.20	5.78
Forward basis price \| Natural gas \| Weighted Average \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	(0.07)	(0.09)
Forward basis price \| Electricity \| Minimum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	(10)	(10)
Forward basis price \| Electricity \| Maximum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	5	6
Forward basis price \| Electricity \| Weighted Average \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	0	0

Value of input used to measure net derivative asset (liability).

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