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Fair Value (Nonrecurring Measurements) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 01, 2018
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  | $ 69,000,000 | $ 116,000,000 | $ 42,000,000 | $ 74,000,000 | $ 92,000,000 | $ 185,000,000 | $ 208,000,000 | $ 537,000,000 |
Other non-operating expense |  |  |  |  |  |  | 92,000,000 | 147,000,000 | 0 |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  | $ (611,000,000) |
Shady Point [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  | 30,000,000 |  |  |  | 30,000,000 |  |
Nejapa [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  | 5,000,000 |  |  |  | 5,000,000 |  |
Guacolda Affiliate [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  |  |  | 144,000,000 |  |
Kilroot and Ballylumford [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 114,000,000 |  |  |  |  | 114,000,000 |  |  |
OPGC Affiliate [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  | 92,000,000 |  |  |  |  |  |  |  |
Estimate of Fair Value Measurement [Member] | Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 315,000,000 |  |  |  |  | 315,000,000 |  |  |
Equity Method Investments [Member] | Elsta [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  |  |  |  |  |  |  | 3,000,000 |  |
Equity Method Investments [Member] | Estimate of Fair Value Measurement [Member] | Elsta [Member] | Level 1 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  | 0 |  |  |  |  |
Equity Method Investments [Member] | Estimate of Fair Value Measurement [Member] | Elsta [Member] | Level 2 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  | 16,000,000 |  |  |  |  |
Equity Method Investments [Member] | Estimate of Fair Value Measurement [Member] | Elsta [Member] | Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  | 0 |  |  |  |  |
Equity Method Investments [Member] | Reported Value Measurement [Member] | Elsta [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  |  |  | 19,000,000 |  |  |  |  |
Equity Method Investments [Member] | Reported Value Measurement [Member] | Guacolda Affiliate [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  |  |  |  |  |  |  |  | $ 354,000,000
Long Lived Assets Held And Used [Member] | Shady Point [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [2] |  |  |  |  |  |  | 157,000,000 |  |
Long Lived Assets Held And Used [Member] | Nejapa [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [3] |  |  |  |  |  |  | 37,000,000 |  |
Long Lived Assets Held And Used [Member] | Kilroot [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 20,000,000 |  |  |  |  | 20,000,000 |  |  |
Long Lived Assets Held And Used [Member] | US Generation Facility [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [3] |  |  |  |  |  | 60,000,000 |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Nejapa [Member] | Level 1 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [3] |  |  |  | 0 |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Nejapa [Member] | Level 2 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [3] |  |  |  | $ 0 |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Nejapa [Member] | Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [3] |  |  | 5,000,000 |  |  |  | 5,000,000 |  |
Long Lived Assets Held And Used [Member] | Reported Value Measurement [Member] | Nejapa [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1],[3] |  |  | 42,000,000 |  |  |  | 42,000,000 |  |
Long Lived Assets Held For Sale [Member] | Guacolda Affiliate [Member] | Level 1 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  | 0 |  |  |  | 0 |  |
Long Lived Assets Held For Sale [Member] | Guacolda Affiliate [Member] | Level 2 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  | 0 |  |  |  | 0 |  |
Long Lived Assets Held For Sale [Member] | Guacolda Affiliate [Member] | Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  | 209,000,000 |  |  |  | 209,000,000 |  |
Long Lived Assets Held For Sale [Member] | Kilroot and Ballylumford [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [2] |  |  |  |  |  | 115,000,000 |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  | 232,000,000 |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Member] | OPGC Affiliate [Member] | Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 212,000,000 |  |  |  |  | 212,000,000 |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Kilroot and Ballylumford [Member] | Level 1 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [2] |  | 0 |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Kilroot and Ballylumford [Member] | Level 2 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [2] |  | 118,000,000 |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Kilroot and Ballylumford [Member] | Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [2] |  | $ 0 |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | OPGC Affiliate [Member] | Level 1 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 0 |  |  |  |  | 0 |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | OPGC Affiliate [Member] | Level 2 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 0 |  |  |  |  | 0 |  |  |
Long Lived Assets Held For Sale [Member] | Reported Value Measurement [Member] | OPGC Affiliate [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] | 304,000,000 |  |  |  |  | 304,000,000 |  |  |
Fair Value, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Shady Point [Member] | Level 1 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [2] |  |  | 0 |  |  |  | 0 |  |
Fair Value, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Shady Point [Member] | Level 2 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [2] | 0 |  |  |  |  | 0 |  |  |
Fair Value, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Shady Point [Member] | Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [2] | 30,000,000 |  |  |  |  | 30,000,000 |  |  |
Fair Value, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | US Generation Facility [Member] | Level 1 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [3] | 0 |  |  |  |  | 0 |  |  |
Fair Value, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | US Generation Facility [Member] | Level 2 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [3] | 0 |  |  |  |  | 0 |  |  |
Fair Value, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | US Generation Facility [Member] | Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [3] | 103,000,000 |  |  |  |  | 103,000,000 |  |  |
Fair Value, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Reported Value Measurement [Member] | Shady Point [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1],[2] |  |  | $ 211,000,000 |  |  |  | $ 211,000,000 |  |
Fair Value, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Reported Value Measurement [Member] | US Generation Facility [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1],[3] | $ 163,000,000 |  |  |  |  | $ 163,000,000 |  |  |
[1] | Represents the carrying values at the dates of initial measurement, before fair value adjustment.
[2] | Per the Company's policy, pre-tax loss is limited to the impairment of long-lived assets. Any additional loss will be recognized on completion of the sale. See Note 22—Asset Impairment Expense and Note 25—Held-for-Sale and Dispositions for further information.
[3] | See Note 22—Asset Impairment Expense for further information.

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