Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details) $ in Millions	Jun. 30, 2022 USD ($) $ / MMBTU $ / MWh	Dec. 31, 2021 USD ($) $ / MMBTU $ / MWh
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	$ 3,229	$ 1,391
Derivative Liabilities	(3,530)	(1,508)
Natural gas
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	902	454
Derivative Liabilities	(1,266)	(594)
Electricity
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	1,960	643
Derivative Liabilities	$ (1,918)	$ (622)
Level 3 \| Natural gas \| Forward basis price \| Minimum \| Discounted Cash Flow
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	(1.82)	(1.36)
Level 3 \| Natural gas \| Forward basis price \| Maximum \| Discounted Cash Flow
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	10.98	3.82
Level 3 \| Natural gas \| Forward basis price \| Weighted Average \| Discounted Cash Flow
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	(0.05)	(0.04)
Level 3 \| Electricity \| Forward basis price \| Minimum \| Discounted Cash Flow
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	(53)	(12)
Level 3 \| Electricity \| Forward basis price \| Maximum \| Discounted Cash Flow
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	20	7
Level 3 \| Electricity \| Forward basis price \| Weighted Average \| Discounted Cash Flow
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	(6)	(2)
Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	$ 581	$ 218
Derivative Liabilities	(1,009)	(433)
Recurring \| Level 3 \| Natural gas
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	107	66
Derivative Liabilities	(469)	(245)
Recurring \| Level 3 \| Electricity
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	443	143
Derivative Liabilities	$ (539)	$ (188)

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

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