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Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Asset Derivatives | $ 40 | $ 31
Derivative assets | 12 | 7
Gross Amounts of Recognized (Liabilities) | (106) | (92)
Derivative liabilities | (78) | (68)
Derivative Liabilities |  |
Derivative [Line Items] |  |
Derivative, Collateral, Obligation to Return Cash | (5) | (4)
Gross Amounts of Recognized (Liabilities) | (106) | (92)
Gross Amounts Offset in the Statement of Financial Position, liabilities | (23) | (20)
Derivative liabilities | (78) | (68)
Financial Collateral (Received) | (73) | (65)
Net amount, liabilities | (10) | (7)
Derivative Assets |  |
Derivative [Line Items] |  |
Asset Derivatives | 40 | 31
Gross Amounts Offset in the Statement of Financial Position, assets | 37 | 26
Derivative assets | 12 | 7
Derivative, Collateral, Obligation to Return Cash | (9) | (2)
Financial Collateral Pledged | 1 | 2
Net Amount, assets | $ 2 | $ 3

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