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Derivative Instruments - Cash Flow Hedges (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) Bcf | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) Bcf | Sep. 30, 2018 USD ($) | Dec. 31, 2018 Bcf
Derivative [Line Items] |  |  |  |  |  |  |
Natural gas held in storage (in cubic feet) | Bcf |  |  | 5 |  | 5 |  | 5
Forecast sale of natural gas from storage designated as cash-flow hedges (in cubic feet) | Bcf |  |  | 3 |  | 3 |  | 4
Unrealized loss included in other comprehensive income | [1] |  | $ (114) | $ (1) | $ (130) | $ (5) |
Interest Rate Contract |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Unrealized loss included in other comprehensive income |  | $ 125 |  |  |  |  |
Interest Rate Contract | Senior Notes |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Debt issuance, face amount |  | $ 13,000 |  |  |  |  |
[1] | Net of tax of $32 million and zero for the three months ended September 30, 2019, and 2018, and $36 million and $1 million for the nine months ended September 30, 2019, and 2018, respectively.

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