- Fair Value Level 3 Inputs, Quantitative Information (Details)
$ in Millions |
Sep. 30, 2019
USD ($)
|
Jun. 30, 2019
USD ($)
|
Dec. 31, 2018
USD ($)
|
Sep. 30, 2018
USD ($)
|
Jun. 30, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
|
| Measurement Input, Commodity Forward Price | Minimum | Discounted Cash Flow |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Energy derivative, measurement input |
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20.02
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| Measurement Input, Commodity Forward Price | Maximum | Discounted Cash Flow |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Energy derivative, measurement input |
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32.58
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| Measurement Input, Discount Rate | Minimum | Discounted Cash Flow |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Energy derivative, measurement input |
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0.0280
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| Measurement Input, Discount Rate | Maximum | Discounted Cash Flow |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Energy derivative, measurement input |
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0.0281
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| Measurement Input, Discount Rate | Broadview Project |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Contingent consideration, measurement input |
0.05
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| Measurement Input, Discount Rate | Broadview Project | Minimum | Discounted Cash Flow |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
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| Contingent consideration, measurement input |
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0.040
|
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| Measurement Input, Discount Rate | Broadview Project | Maximum | Discounted Cash Flow |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Contingent consideration, measurement input |
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0.080
|
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| Measurement Input, Discount Rate | Tsugaru Holdings | Discounted Cash Flow |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
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|
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| Contingent consideration, measurement input |
0.0690
|
|
0.0690
|
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| Measurement Input, Annual Energy Production Loss | Broadview Project | Discounted Cash Flow |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Contingent consideration, measurement input |
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|
0.0070
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| Measurement Input, Deferred Purchase Price | Tsugaru Holdings | Minimum | Discounted Cash Flow |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Contingent consideration, measurement input |
109
|
|
109
|
|
|
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| Measurement Input, Deferred Purchase Price | Tsugaru Holdings | Maximum | Discounted Cash Flow |
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|
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
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|
|
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| Contingent consideration, measurement input |
128
|
|
128
|
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| Contingent Consideration | Recurring Measurement Basis |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Contingent consideration |
$ 122
|
$ 111
|
$ 130
|
$ 125
|
$ 128
|
$ 22
|
| Contingent Consideration | Broadview Project | Recurring Measurement Basis | Level 3 |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Contingent consideration |
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|
25
|
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| Contingent Consideration | Tsugaru Holdings | Recurring Measurement Basis | Level 3 |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Contingent consideration |
$ 122
|
|
105
|
|
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|
| Energy derivative | Recurring Measurement Basis | Level 3 |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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|
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| Energy derivative |
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|
$ 7
|
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