Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details) $ in Millions	Jun. 30, 2018 USD ($) $ / MMBTU $ / MWh	Dec. 31, 2017 USD ($) $ / MMBTU $ / MWh
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	$ 388	$ 652
Derivative Liabilities	(372)	(657)
Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	96	148
Derivative Liabilities	(119)	(157)
Natural gas
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	190	357
Derivative Liabilities	(192)	(378)
Natural gas \| Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	59	97
Derivative Liabilities	(84)	(126)
Electricity
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	181	285
Derivative Liabilities	(180)	(275)
Electricity \| Recurring \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Derivative Assets	22	42
Derivative Liabilities	$ (35)	$ (30)
Forward basis price \| Natural gas \| Minimum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	(1.28)	(1.10)
Forward basis price \| Natural gas \| Maximum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	4.30	9.75
Forward basis price \| Natural gas \| Weighted Average \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	(0.13)	(0.03)
Forward basis price \| Electricity \| Minimum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	(7)	(5)
Forward basis price \| Electricity \| Maximum \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	7	15
Forward basis price \| Electricity \| Weighted Average \| Discounted Cash Flow \| Level 3
Unobservable Inputs Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	0	2

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

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