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Fair Value Measurements (Significant Unobservable Inputs) (Details) - Significant Unobservable Inputs (Level 3) [Member] $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) $ / MMBTU $ / MWh $ / energy_unit
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Assets, Fair Value Disclosure | $ 1,358
Liabilities, Fair Value Disclosure | 660
Forward Contracts - Power [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Assets, Fair Value Disclosure | 845
Liabilities, Fair Value Disclosure | $ 328
Forward Contracts - Power [Member] | Forward Price [Member] | Maximum [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Offered Quotes, Price Per Energy Unit | $ / MWh | 130
Forward Contracts - Power [Member] | Forward Price [Member] | Minimum [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Offered Quotes, Price Per Energy Unit | $ / MWh | 0
Forward contracts - Gas [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Assets, Fair Value Disclosure | $ 26
Liabilities, Fair Value Disclosure | $ 13
Forward contracts - Gas [Member] | Forward Price [Member] | Maximum [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Offered Quotes, Price Per Energy Unit | $ / MMBTU | 7
Forward contracts - Gas [Member] | Forward Price [Member] | Minimum [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Offered Quotes, Price Per Energy Unit | $ / MMBTU | 2
Forward contracts - Other [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Assets, Fair Value Disclosure | $ 0
Liabilities, Fair Value Disclosure | $ 5
Forward contracts - Other [Member] | Forward Price [Member] | Maximum [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Offered Quotes, Price Per Energy Unit | $ / energy_unit | 57
Forward contracts - Other [Member] | Forward Price [Member] | Minimum [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Offered Quotes, Price Per Energy Unit | $ / energy_unit | (40)
Option Contracts, Power [Member] | Options Models, Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Assets, Fair Value Disclosure | $ 47
Liabilities, Fair Value Disclosure | $ 17
Option Contracts, Power [Member] | Implied Correlations [Member] | Maximum [Member] | Options Models, Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Expected Rates | 100.00%
Option Contracts, Power [Member] | Implied Correlations [Member] | Minimum [Member] | Options Models, Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Expected Rates | 1.00%
Option Contracts, Power [Member] | Implied Volatilities [Member] | Maximum [Member] | Options Models, Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Expected Rates | 493.00%
Option Contracts, Power [Member] | Implied Volatilities [Member] | Minimum [Member] | Options Models, Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Expected Rates | 8.00%
Options - primarily gas [Member] | Options Models, Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Assets, Fair Value Disclosure | $ 165
Liabilities, Fair Value Disclosure | $ 199
Options - primarily gas [Member] | Implied Correlations [Member] | Maximum [Member] | Options Models, Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Expected Rates | 100.00%
Options - primarily gas [Member] | Implied Correlations [Member] | Minimum [Member] | Options Models, Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Expected Rates | 1.00%
Options - primarily gas [Member] | Implied Volatilities [Member] | Maximum [Member] | Options Models, Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Expected Rates | 290.00%
Options - primarily gas [Member] | Implied Volatilities [Member] | Minimum [Member] | Options Models, Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Expected Rates | 1.00%
Full Requirements and Unit Contingent Contracts [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Assets, Fair Value Disclosure | $ 275
Liabilities, Fair Value Disclosure | $ 98
Full Requirements and Unit Contingent Contracts [Member] | Forward Price [Member] | Maximum [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Offered Quotes, Price Per Energy Unit | $ / MWh | 293
Full Requirements and Unit Contingent Contracts [Member] | Forward Price [Member] | Minimum [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Offered Quotes, Price Per Energy Unit | $ / MWh | (29)
Full Requirements and Unit Contingent Contracts [Member] | Customer Migration Rate [Member] | Maximum [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Expected Rates | 20.00%
Full Requirements and Unit Contingent Contracts [Member] | Customer Migration Rate [Member] | Minimum [Member] | Discounted Cash Flow Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value Inputs, Expected Rates | 0.00%
NEER [Member] | Interest Rate Swap [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Liabilities, Fair Value Disclosure | $ 132

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