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Investment Information - Investment in operating affiliates (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Investment in operating affiliates	$ 1,174		$ 1,119
Income (loss) from operating affiliates	$ 55	$ 39
Coface
Schedule of Equity Method Investments [Line Items]
Percentage ownership	29.90%
Investment in operating affiliates	$ 586		570
Greysbridge Holdings Ltd
Schedule of Equity Method Investments [Line Items]
Percentage ownership	40.00%
Investment in operating affiliates	$ 472		$ 430
Issued Shares Excluding Treasury Stock | Coface
Schedule of Equity Method Investments [Line Items]
Percentage ownership	30.10%

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-Topic 323
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