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Derivative Instruments (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |
Total loss to be reclassified during next 12 months | $ 9 |
Margin cash collateral received from counterparties that was not offset against derivative assets | 12 | $ 16
Margin cash collateral provided to counterparties that was not offset against derivative assets or liabilities | 238 | $ 157
Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Derivative [Line Items] |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 6 |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | $ 5 |

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