Derivative Instruments and Hedging Activities - Offsetting Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative liabilities
Derivative liabilities, gross amount	$ 1,868	$ 1,518
Derivative liabilities, offsetting financial instruments	(252)	(383)
Derivative liabilities, offsetting cash collateral	(292)	(356)
Total derivative liabilities	1,324	779
Derivative liabilities, securities collateral not netted	0	0
Net exposure	1,324	779
Repurchase agreements
Gross amounts	820	668
Repurchase agreements, securities sold, offset	0	0
Repurchase agreements, cash collateral pledged, offset	0	0
Net amounts as recognized	820	668
Repurchase agreements, securities collateral not netted	(820)	(668)
Net exposure	0	0
Derivative, collateral, obligation to return cash	377	862
Derivative, collateral, obligation to return securities	1	1
Derivative, collateral, right to reclaim cash	2,000	1,500
Securities sold under repurchase agreements, fair value of collateral	$ 836	$ 682