Derivative Instruments - Schedule of Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Financial Assets
Gross amount of recognized assets	$ 16,223	$ 11,867
Gross amounts offset	(6,856)	(4,453)
Net amount of assets	9,367	7,414
Cash collateral	(6,903)	(5,229)
Non-cash collateral	(1,491)	(1,245)
Net amount	973	940
Financial Liabilities
Gross amount of recognized liabilities	11,524	10,596
Gross amounts offset	(87)	(612)
Net amount of liabilities	11,437	9,984
Cash collateral	(114)	(188)
Non-cash collateral	(72)	(167)
Net amount	11,251	9,629
Excess non-cash collateral received	1,400	1,300
Excess non-cash collateral pledged	89	82
Derivative Instruments
Financial Assets
Gross amount of recognized assets	15,250	10,927
Gross amounts offset	(6,856)	(4,453)
Net amount of assets	8,394	6,474
Cash collateral	(6,903)	(5,229)
Non-cash collateral	(1,491)	(1,245)
Net amount	0	0
Financial Liabilities
Gross amount of recognized liabilities	273	967
Gross amounts offset	(87)	(612)
Net amount of liabilities	186	355
Cash collateral	(114)	(188)
Non-cash collateral	(72)	(167)
Net amount	0	0
Embedded Derivative Instruments
Financial Assets
Gross amount of recognized assets	973	940
Gross amounts offset	0	0
Net amount of assets	973	940
Cash collateral	0	0
Non-cash collateral	0	0
Net amount	973	940
Financial Liabilities
Gross amount of recognized liabilities	11,251	9,629
Gross amounts offset	0	0
Net amount of liabilities	11,251	9,629
Cash collateral	0	0
Non-cash collateral	0	0
Net amount	$ 11,251	$ 9,629