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Derivative Instruments and Hedging Activities - Offsetting Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative assets |  |
Derivative assets, gross amount | $ 1,729 | $ 1,539
Derivative assets, offsetting financial instruments | (347) | (205)
Derivative assets, offsetting cash collateral | (286) | (874)
Total derivative assets | 1,096 | 460
Derivative assets, securities not netted | 0 | 0
Net Exposure | 1,096 | 460
Derivative, collateral, obligation to return cash | 347 | 925
Derivative, collateral, obligation to return securities | 1 | 1
Derivative, collateral, right to reclaim cash | $ 954 | $ 633

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