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Unearned revenue liability (URL Rollforward) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Insurance [Abstract]    
Balance – beginning of period $ 711 $ 673
Deferred revenue 101 106
Amortization (58) (54)
Other (including foreign exchange) 6 (13)
Balance – end of period $ 760 $ 712