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	$ 16,500	$ 12,147
Gross amounts offset	(6,830)	(4,409)
Net amount of assets	9,670	7,738
Cash collateral	(6,691)	(5,107)
Non-cash collateral	(1,463)	(1,198)
Net amount	1,516	1,433
Financial Liabilities
Gross amount of recognized liabilities	11,159	10,045
Gross amounts offset	(87)	(612)
Net amount of liabilities	11,072	9,433
Cash collateral	(114)	(188)
Non-cash collateral	(62)	(168)
Net amount	10,896	9,077
Excess non-cash collateral received	1,400	1,300
Excess non-cash collateral pledged	99	81
Derivative Instruments
Financial Assets
Gross amount of recognized assets	14,984	10,714
Gross amounts offset	(6,830)	(4,409)
Net amount of assets	8,154	6,305
Cash collateral	(6,691)	(5,107)
Non-cash collateral	(1,463)	(1,198)
Net amount	0	0
Financial Liabilities
Gross amount of recognized liabilities	263	968
Gross amounts offset	(87)	(612)
Net amount of liabilities	176	356
Cash collateral	(114)	(188)
Non-cash collateral	(62)	(168)
Net amount	0	0
Embedded Derivative Instruments
Financial Assets
Gross amount of recognized assets	1,516	1,433
Gross amounts offset	0	0
Net amount of assets	1,516	1,433
Cash collateral	0	0
Non-cash collateral	0	0
Net amount	1,516	1,433
Financial Liabilities
Gross amount of recognized liabilities	10,896	9,077
Gross amounts offset	0	0
Net amount of liabilities	10,896	9,077
Cash collateral	0	0
Non-cash collateral	0	0
Net amount	$ 10,896	$ 9,077