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v3.19.2

Derivatives - Cash Flow Hedges (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) Bcf | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Bcf | Jun. 30, 2018 USD ($) | Dec. 31, 2018 Bcf
Derivative [Line Items] |  |  |  |  |  |
Natural gas held in storage (in cubic feet) | Bcf |  | 4 |  | 4 |  | 5
Forecast sale of natural gas from storage designated as cash-flow hedges (in cubic feet) | Bcf |  |  |  |  |  | 4
Unrealized loss included in other comprehensive income | [1] | $ 18,000,000 | $ 1,000,000 | $ 16,000,000 | $ 4,000,000 |
Cash Flow Hedging | Interest Rate Contract, 10-Year Tenor |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Treasury tenor |  |  |  | 10 years |  |
Notional value |  | $ 750,000,000 |  | $ 750,000,000 |  |
Weighted Average Fixed Rate |  | 2.11% |  | 2.11% |  |
Unrealized loss included in other comprehensive income |  |  |  | $ 7,000,000 |  |
Liability |  | $ 7,000,000 |  | $ 7,000,000 |  |
Cash Flow Hedging | Interest Rate Contract, 30-Year Tenor |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Treasury tenor |  |  |  | 30 years |  |
Notional value |  | $ 750,000,000 |  | $ 750,000,000 |  |
Weighted Average Fixed Rate |  | 2.59% |  | 2.59% |  |
Unrealized loss included in other comprehensive income |  |  |  | $ 11,000,000 |  |
Liability |  | $ 11,000,000 |  | 11,000,000 |  |
Cash Flow Hedging | Interest Rate Contract | Level 2 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Liability |  | $ 18,000,000 |  | $ 18,000,000 |  |
[1] | Net of tax of $5 and zero for the three months ended June 30, 2019, and 2018, and $5 and $1 for the six months ended June 30, 2019, and 2018, respectively.

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