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Derivative Instruments - Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Asset Derivatives | $ 30 | $ 31
Derivative assets | 11 | 7
Accrued Interest and Cash Collateral (Received) | (1) | (4)
Gross Amounts of Recognized (Liabilities) | (90) | (92)
Derivative Liability | (71) | (68)
Other liabilities |  |
Derivative [Line Items] |  |
Accrued Interest and Cash Collateral (Received) | (4) | (4)
Gross Amounts of Recognized (Liabilities) | (90) | (92)
Gross Amounts Offset in the Statement of Financial Position, liabilities | (15) | (20)
Derivative Liability | (71) | (68)
Financial Collateral (Received) | (68) | (65)
Net amount, liabilities | (7) | (7)
Other investments |  |
Derivative [Line Items] |  |
Asset Derivatives | 30 | 31
Gross Amounts Offset in the Statement of Financial Position, assets | 26 | 26
Derivative assets | 11 | 7
Accrued Interest and Cash Collateral (Received) | (7) | (2)
Financial Collateral Pledged | 1 | 2
Net Amount, assets | $ 3 | $ 3

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