Derivative Instruments and Hedging Activities - Offsetting Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative liabilities
Gross Amounts	$ 2,934	$ 2,932
Financial Instruments	(268)	(433)
Cash Collateral Pledged	(172)	(164)
Net Amounts as Recognized	2,494	2,335
Securities Collateral Pledged Under Master Netting Agreements	(24)	(13)
Net Exposure	2,470	2,322
Repurchase agreements
Gross Amounts	568	538
Financial Instruments	0	0
Cash Collateral Pledged	0	0
Net Amounts as Recognized	568	538
Securities Collateral Pledged Under Master Netting Agreements	(568)	(538)
Net Exposure	0	0
Derivative, collateral, obligation to return cash	1,100	858
Derivative, collateral, obligation to return securities	13	16
Derivative, collateral, right to reclaim cash	1,600	1,700
Securities sold under repurchase agreements, fair value of collateral	$ 579	$ 549