Financial Instruments - Derivative Activities Table (Details) - Investment Segment - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Equity contracts
Primary underlying risk:
Long Notional Exposure	$ 1,499	$ 1,813
Short Notional Exposure	2,386	1,845
Credit contracts
Primary underlying risk:
Long Notional Exposure	0	185
Short Notional Exposure		55
Commodity contracts
Primary underlying risk:
Short Notional Exposure	$ 346	90
Credit Default Swap
Primary underlying risk:
Short notional amount of credit default swap positions		$ 213