Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details) $ in Millions	Sep. 30, 2018 USD ($) $ / MWh $ / MMBTU	Dec. 31, 2017 USD ($) $ / MWh $ / MMBTU
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	$ 442	$ 652
Derivative Liabilities	(458)	(657)
Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	103	148
Derivative Liabilities	(153)	(157)
Natural gas
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	200	357
Derivative Liabilities	(229)	(378)
Natural gas \| Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	53	97
Derivative Liabilities	(99)	(126)
Electricity
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	234	285
Derivative Liabilities	(227)	(275)
Electricity \| Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	44	42
Derivative Liabilities	$ (54)	$ (30)
Forward basis price \| Natural gas \| Minimum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	(1.81)	(1.10)
Forward basis price \| Natural gas \| Maximum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	5.99	9.75
Forward basis price \| Natural gas \| Weighted Average \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	(0.12)	(0.03)
Forward basis price \| Electricity \| Minimum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	(6)	(5)
Forward basis price \| Electricity \| Maximum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	9	15
Forward basis price \| Electricity \| Weighted Average \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	1	2

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

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