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Derivative Instruments and Hedging Activities - Offsetting Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivative liabilities
Derivative liabilities, gross amount	$ 1,197	$ 1,201
Derivative liabilities, offsetting financial instruments	(347)	(205)
Derivative liabilities, offsetting cash collateral	(176)	(82)
Total derivative liabilities	674	914
Derivative liabilities, securities collateral not netted	0	0
Net exposure	674	914
Repurchase agreements
Gross amounts	314	352
Repurchase agreements, securities sold, offset	0	0
Repurchase agreements, cash collateral pledged, offset	0	0
Net amounts as recognized	314	352
Repurchase agreements, securities collateral not netted	(314)	(352)
Net exposure	0	0
Derivative, collateral, obligation to return cash	347	925
Derivative, collateral, obligation to return securities	1	1
Derivative, collateral, right to reclaim cash	954	633
Securities sold under repurchase agreements, fair value of collateral	$ 320	$ 359

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