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Investments (Tables)
9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Pre-tax (Losses)/Gains for Marketable Securities
Pre-tax (losses)/gains for marketable securities are summarized below:

Three Months Ended September 30, 2023
Nine Months Ended September 30, 2023
(in millions)
Gain on marketable securities sold during the period
$— $593 
Dividend income and other
(1)13 
Total (loss)/gain on marketable securities
$(1)$606