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Investment Information - Investment in operating affiliates (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Investment in operating affiliates	$ 1,015		$ 965
Income (loss) from operating affiliates	$ 39	$ 25
Coface
Schedule of Equity Method Investments [Line Items]
Percentage ownership	29.86%
Investment in operating affiliates	$ 576		563
Greysbridge Holdings Ltd
Schedule of Equity Method Investments [Line Items]
Percentage ownership	40.00%
Investment in operating affiliates	$ 330		$ 306
Issued Shares Excluding Treasury Stock | Coface
Schedule of Equity Method Investments [Line Items]
Percentage ownership	30.09%

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