Derivative Instruments - Hedged Items in Fair Value Hedging Relationships (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Hedged Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	Carrying Amount Assets (Liabilities)	Carrying Amount Assets (Liabilities)
Hedged Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	Carrying Amount Assets (Liabilities)	Carrying Amount Assets (Liabilities)
Hedged asset, carrying amount	$ 449,137	$ 293,788
Hedged asset, total basis adjustments	(174)	(628)
Hedged asset, discontinued fair value, remaining adjustments	(174)	(628)
Closed portfolio, amortized cost	218,419	98,377
Closed portfolio, designated UPB	9,955	5,187
Hedged liability, carrying amount	(59,462)	(73,790)
Hedged liability, total basis adjustments	3,751	4,713
Hedged liability, discontinued fair value, remaining adjustments	$ 3,751	$ 4,713