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Fair Value (Nonrecurring Unobservable Inputs) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Liabilities Value |  | $ (102) |
Laurel Mountain [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  | $ 30
Kilroot [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  | 5
Fair Value | Level 3 |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 315 |
Long Lived Assets Held For Sale [Member] | Level 3 | OPGC Affiliate [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 212 |
Long Lived Assets Held And Used [Member] | Hawaii Subsidiary [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 103 |
Long Lived Assets Held And Used [Member] | Level 3 | Hawaii Subsidiary [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | $ 103 |
Long Lived Assets Held And Used [Member] | Fair Value | Level 3 | Kilroot [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  | $ 5
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum | Hawaii Subsidiary [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | (11.00%) |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum | OPGC Affiliate [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | (27.00%) |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum | Hawaii Subsidiary [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 1.00% |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum | OPGC Affiliate [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 41.00% |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | Hawaii Subsidiary [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | (6.00%) |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | OPGC Affiliate [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 2.00% |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum | Hawaii Subsidiary [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 5.00% |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum | OPGC Affiliate [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 0.00% |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum | Hawaii Subsidiary [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 35.00% |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum | OPGC Affiliate [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 0.00% |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | Hawaii Subsidiary [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 29.00% |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | OPGC Affiliate [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 0.00% |
Measurement Input, Discount Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum | Hawaii Subsidiary [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 5.00% |
Measurement Input, Discount Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum | Hawaii Subsidiary [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 15.00% |
Measurement Input, Discount Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | OPGC Affiliate [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 9.00% |
[1] | See Note 22—Asset Impairment Expense for further information.

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