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Investments - Derivative Financial Instruments (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Derivative gain (loss) reclassified from other comprehensive income into shareholders' net income
Derivative gain (loss) recognized in other comprehensive income
Derivative gain (loss) recognized in the income statement
Designated as Hedging Instrument \| Fair Value Hedging \| Fair value hedge - Interest rate swap contracts
Derivative [Line Items]
Notional Value	$ 2,800	$ 2,700