Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details) $ in Millions	Mar. 31, 2019 USD ($) $ / MMBTU $ / MWh	Dec. 31, 2018 USD ($) $ / MMBTU $ / MWh
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	$ 340	$ 663
Derivative Liabilities	(338)	(669)
Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	80	126
Derivative Liabilities	(113)	(170)
Natural gas
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	178	349
Derivative Liabilities	(166)	(380)
Natural gas \| Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	57	63
Derivative Liabilities	(67)	(112)
Electricity
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	155	303
Derivative Liabilities	(165)	(285)
Electricity \| Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	21	56
Derivative Liabilities	$ (46)	$ (58)
Forward basis price \| Natural gas \| Minimum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	(0.88)	(2.15)
Forward basis price \| Natural gas \| Maximum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	5.97	5.59
Forward basis price \| Natural gas \| Weighted Average \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	(0.07)	(0.10)
Forward basis price \| Electricity \| Minimum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	(7)	(7)
Forward basis price \| Electricity \| Maximum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	7	9
Forward basis price \| Electricity \| Weighted Average \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	0	1

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

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