Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details) $ in Millions	Dec. 31, 2018 USD ($) $ / MMBTU $ / MWh	Dec. 31, 2017 USD ($) $ / MMBTU $ / MWh
Unobservable Input Valuation Techniques [Line Items]
Derivative Assets	$ 663	$ 652
Derivative Liabilities	(669)	(657)
Natural Gas
Unobservable Input Valuation Techniques [Line Items]
Derivative Assets	349	357
Derivative Liabilities	(380)	(378)
Electricity
Unobservable Input Valuation Techniques [Line Items]
Derivative Assets	303	285
Derivative Liabilities	$ (285)	$ (275)
Level 3 \| Discounted Cash Flow \| Forward basis price \| Natural Gas \| Minimum
Unobservable Input Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	(2.15)	(1.10)
Level 3 \| Discounted Cash Flow \| Forward basis price \| Natural Gas \| Maximum
Unobservable Input Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	5.59	9.75
Level 3 \| Discounted Cash Flow \| Forward basis price \| Natural Gas \| Weighted Average
Unobservable Input Valuation Techniques [Line Items]
Forward basis price \| $ / MMBTU	(0.10)	(0.03)
Level 3 \| Discounted Cash Flow \| Forward basis price \| Electricity \| Minimum
Unobservable Input Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	(7)	(5)
Level 3 \| Discounted Cash Flow \| Forward basis price \| Electricity \| Maximum
Unobservable Input Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	9	15
Level 3 \| Discounted Cash Flow \| Forward basis price \| Electricity \| Weighted Average
Unobservable Input Valuation Techniques [Line Items]
Forward basis price \| $ / MWh	1	2
Recurring \| Level 3
Unobservable Input Valuation Techniques [Line Items]
Derivative Assets	$ 126	$ 148
Derivative Liabilities	(170)	(157)
Recurring \| Level 3 \| Natural Gas
Unobservable Input Valuation Techniques [Line Items]
Derivative Assets	63	97
Derivative Liabilities	(112)	(126)
Recurring \| Level 3 \| Electricity
Unobservable Input Valuation Techniques [Line Items]
Derivative Assets	56	42
Derivative Liabilities	$ (58)	$ (30)

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

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