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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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