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Derivative Instruments - Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative [Line Items] |  |
Derivative assets | $ 14 | $ 10
Derivative liabilities | (61) | (100)
Other liabilities | Other Investments and Other Liabilities |  |
Derivative [Line Items] |  |
Accrued Interest and Cash Collateral (Received) | (8) | (5)
Gross Amounts of Recognized (Liabilities) | (74) | (115)
Gross Amounts Offset in the Statement of Financial Position, liabilities | (5) | (10)
Derivative liabilities | (61) | (100)
Financial Collateral (Received) | (61) | (96)
Net amount, liabilities | (8) | (9)
Other investments | Other Investments and Other Liabilities |  |
Derivative [Line Items] |  |
Asset Derivatives | 27 | 25
Gross Amounts Offset in the Statement of Financial Position, assets | 23 | 22
Derivative assets | 14 | 10
Accrued Interest and Cash Collateral (Received) | (10) | (7)
Financial Collateral Pledged | 2 | 1
Net Amount, assets | $ 2 | $ 2

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