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Investments (Tables)
3 Months Ended
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Pre-tax Gains and Losses for Marketable Securities
Pre-tax gains for marketable securities are summarized below:

Three Months Ended March 31, 2023
 (in millions)
Unrealized gain on marketable securities held as of the end of the period
$787 
Dividend income and other
Total gain on marketable securities$796