Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details) $ in Millions	Jun. 30, 2020 USD ($) MMBTU MWh	Dec. 31, 2019 USD ($) MWh MMBTU
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	$ 703	$ 775
Derivative Liabilities	(640)	(770)
Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	149	160
Derivative Liabilities	(103)	(156)
Natural gas
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	250	355
Derivative Liabilities	(226)	(351)
Natural gas \| Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	71	74
Derivative Liabilities	(51)	(89)
Electricity
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	223	306
Derivative Liabilities	(211)	(298)
Electricity \| Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	68	83
Derivative Liabilities	$ (52)	$ (67)
Forward basis price \| Natural gas \| Minimum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| MMBTU	(0.74)	(1.78)
Forward basis price \| Natural gas \| Maximum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| MMBTU	4.18	5.78
Forward basis price \| Natural gas \| Weighted Average \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| MMBTU	(0.06)	(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	14	6
Forward basis price \| Electricity \| Weighted Average \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| MWh	(1)	0

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

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