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Derivative Instruments - Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Asset Derivatives | $ 33 | $ 33
Derivative assets | 22 | 23
Gross Amounts of Recognized (Liabilities) | (66) | (94)
Derivative Liability | (55) | (84)
Other liabilities |  |
Derivative [Line Items] |  |
Derivative, Collateral, Obligation to Return Cash | 7 | 4
Gross Amounts of Recognized (Liabilities) | (66) | (94)
Gross Amounts Offset in the Statement of Financial Position, liabilities | (4) | (6)
Derivative Liability | (55) | (84)
Derivative, Collateral, Obligation to Return Cash | (7) | (4)
Financial Collateral (Received) | (57) | (83)
Net amount, liabilities | (5) | (5)
Other investments |  |
Derivative [Line Items] |  |
Asset Derivatives | 33 | 33
Gross Amounts Offset in the Statement of Financial Position, assets | 30 | 31
Derivative assets | 22 | 23
Derivative, Collateral, Obligation to Return Cash | 19 | 21
Financial Collateral Pledged | 1 | 1
Net Amount, assets | 2 | 1
Derivative, Collateral, Obligation to Return Cash | $ (19) | $ (21)

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