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Derivatives - Offsetting Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Offsetting of Financial Liabilities under Master Netting Agreements with Derivative Counterparties |  |
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet | $ 53 | $ 197
Net Amount of Derivative Liabilities | 15 | 170
Derivatives subject to master netting agreements |  |
Offsetting of Financial Liabilities under Master Netting Agreements with Derivative Counterparties |  |
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet | 53 | 197
Gross Amount of Eligible Offsetting Recognized Derivative Assets | 38 | 27
Net Amount of Derivative Liabilities | $ 15 | $ 170

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