Derivative Instruments and Hedging Activities - Offsetting Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative liabilities
Gross Amounts	$ 2,932	$ 4,550
Financial Instruments	(433)	(759)
Cash Collateral Pledged	(164)	(476)
Net Amounts as Recognized	2,335	3,315
Securities Collateral Pledged Under Master Netting Agreements	(13)	(85)
Net Exposure	2,322	3,230
Repurchase agreements
Gross Amounts	538	883
Financial Instruments	0	0
Cash Collateral Pledged	0	0
Net Amounts as Recognized	538	883
Securities Collateral Pledged Under Master Netting Agreements	(538)	(883)
Net Exposure	0	0
Derivative, collateral, obligation to return cash	858	608
Derivative, collateral, obligation to return securities	16	82
Derivative, collateral, right to reclaim cash	1,700	2,300
Securities sold under repurchase agreements, fair value of collateral	$ 549	$ 900