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v3.19.2

Fair Value (Nonrecurring Measurements) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Asset Retirement Obligation | $ 23 |  | $ 23 |
Asset Impairment Charges |  |  | 116 | $ 93
Other Asset Impairment Charges | 116 | $ 92 | 116 | 92
Kilroot and Ballylumford [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | 114 |  | 114 |
Shady Point [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 127 |  | 127
Long Lived Assets Held For Sale [Member] | Kilroot and Ballylumford [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other Asset Impairment Charges |  |  | 115 |
Long Lived Assets Held For Sale [Member] | Fair Value [Member] | Kilroot and Ballylumford [Member] | Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | 0 |  | 0 |
Long Lived Assets Held For Sale [Member] | Fair Value [Member] | Kilroot and Ballylumford [Member] | Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | 118 |  | 118 |
Long Lived Assets Held For Sale [Member] | Fair Value [Member] | Kilroot and Ballylumford [Member] | Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | 0 |  | 0 |
Long Lived Assets Held For Sale [Member] | Carrying Amount [Member] | Kilroot and Ballylumford [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | $ 232 |  | $ 232 |
Long Lived Assets Held And Used [Member] | Shady Point [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other Asset Impairment Charges |  |  |  | 83
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Shady Point [Member] | Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 0 |  | 0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Shady Point [Member] | Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 0 |  | 0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Shady Point [Member] | Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 127 |  | 127
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Shady Point [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | $ 210 |  | $ 210
Interest Rate Contract [Member] | Measurement Input, Entity Credit Risk [Member] | Weighted Average [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  |  | 4.00% |
Interest Rate Contract [Member] | Measurement Input, Entity Credit Risk [Member] | Maximum [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  |  | 4.38% |
Interest Rate Contract [Member] | Measurement Input, Entity Credit Risk [Member] | Minimum [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  |  | 2.00% |

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