Derivative Instruments - Schedule of Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Financial Assets
Gross amount of recognized assets	$ 11,867	$ 7,545
Gross amounts offset	(4,453)	(3,010)
Net amount of assets	7,414	4,535
Cash collateral	(5,229)	(3,273)
Non-cash collateral	(1,245)	(321)
Net amount	940	941
Financial Liabilities
Gross amount of recognized liabilities	10,596	5,043
Gross amounts offset	(612)	(50)
Net amount of liabilities	9,984	4,993
Cash collateral	(188)	(172)
Non-cash collateral	(167)	(38)
Net amount	9,629	4,783
Excess non-cash collateral received	1,300	1,100
Excess non-cash collateral pledged	82	8
Derivative Instruments
Financial Assets
Gross amount of recognized assets	10,927	6,604
Gross amounts offset	(4,453)	(3,010)
Net amount of assets	6,474	3,594
Cash collateral	(5,229)	(3,273)
Non-cash collateral	(1,245)	(321)
Net amount	0	0
Financial Liabilities
Gross amount of recognized liabilities	967	260
Gross amounts offset	(612)	(50)
Net amount of liabilities	355	210
Cash collateral	(188)	(172)
Non-cash collateral	(167)	(38)
Net amount	0	0
Embedded Derivative Instruments
Financial Assets
Gross amount of recognized assets	940	941
Gross amounts offset	0	0
Net amount of assets	940	941
Cash collateral	0	0
Non-cash collateral	0	0
Net amount	940	941
Financial Liabilities
Gross amount of recognized liabilities	9,629	4,783
Gross amounts offset	0	0
Net amount of liabilities	9,629	4,783
Cash collateral	0	0
Non-cash collateral	0	0
Net amount	$ 9,629	$ 4,783