Derivative Instruments - Credit Derivatives (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Credit Derivatives - supplemental information
Tranche credit default swap realized credit loss protection	$ 1,000,000
Tranche credit default swap portfolio of exposure	10,000,000
Maximum payout/Notional amount
Protection sold	(628,130,000,000)	$ (561,097,000,000)
Protection purchased with identical underlyings	736,530,000,000	612,481,000,000
Net protection (sold)/purchased	108,400,000,000	51,384,000,000
Other protection purchased	29,497,000,000	27,498,000,000
Total credit derivatives
Maximum payout/Notional amount
Protection sold	(628,130,000,000)	(561,097,000,000)
Protection purchased with identical underlyings	736,530,000,000	612,481,000,000
Net protection (sold)/purchased	108,400,000,000	51,384,000,000
Other protection purchased	16,335,000,000	17,027,000,000
Credit default swaps
Maximum payout/Notional amount
Protection sold	(503,480,000,000)	(450,184,000,000)
Protection purchased with identical underlyings	549,440,000,000	474,554,000,000
Net protection (sold)/purchased	45,960,000,000	24,370,000,000
Other protection purchased	6,840,000,000	6,858,000,000
Other credit derivatives
Maximum payout/Notional amount
Protection sold	(124,650,000,000)	(110,913,000,000)
Protection purchased with identical underlyings	187,090,000,000	137,927,000,000
Net protection (sold)/purchased	62,440,000,000	27,014,000,000
Other protection purchased	9,495,000,000	10,169,000,000
Credit-related notes
Maximum payout/Notional amount
Protection sold	0	0
Protection purchased with identical underlyings	0	0
Net protection (sold)/purchased	0	0
Other protection purchased	$ 13,162,000,000	$ 10,471,000,000