Derivative Instruments - Schedule of Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Financial Assets
Gross amount of recognized assets	$ 19,728	$ 15,997
Gross amounts offset	(6,815)	(3,787)
Net amount of assets	12,913	12,210
Cash collateral	(8,714)	(7,039)
Non-cash collateral	(1,691)	(2,473)
Net amount	2,508	2,698
Financial Liabilities
Gross amount of recognized liabilities	15,118	13,057
Gross amounts offset	(90)	(432)
Net amount of liabilities	15,028	12,625
Cash collateral	(34)	(91)
Non-cash collateral	(35)	(85)
Net amount	14,959	12,449
Excess non-cash collateral received	1,200	791
Excess non-cash collateral pledged		29
Derivative Instruments
Financial Assets
Gross amount of recognized assets	17,220	13,299
Gross amounts offset	(6,815)	(3,787)
Net amount of assets	10,405	9,512
Cash collateral	(8,714)	(7,039)
Non-cash collateral	(1,691)	(2,473)
Net amount	0	0
Financial Liabilities
Gross amount of recognized liabilities	200	608
Gross amounts offset	(90)	(432)
Net amount of liabilities	110	176
Cash collateral	(34)	(91)
Non-cash collateral	(35)	(85)
Net amount	41	0
Embedded Derivative Instruments
Financial Assets
Gross amount of recognized assets	2,508	2,698
Gross amounts offset	0	0
Net amount of assets	2,508	2,698
Cash collateral	0	0
Non-cash collateral	0	0
Net amount	2,508	2,698
Financial Liabilities
Gross amount of recognized liabilities	14,918	12,449
Gross amounts offset	0	0
Net amount of liabilities	14,918	12,449
Cash collateral	0	0
Non-cash collateral	0	0
Net amount	$ 14,918	$ 12,449