Investments - Equity Investments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase (Decrease) In Equity Investments [Roll Forward]
Marketable securities, beginning balance	$ 506
Nonmarketable securities, beginning balance	1,223
Total equity investments, beginning balance	1,729
Marketable securities, purchases	0
Nonmarketable securities, purchases	42
Total equity investments, purchases	42
Marketable securities, sales	(104)
Nonmarketable securities, sales	(21)
Total equity investments, sales	(125)
Marketable securities, changes in fair value	(28)
Nonmarketable securities, changes in fair value	(1)
Total equity investments, changes in fair value	(29)	$ (61)	$ (145)
Marketable securities, other	(137)
Nonmarketable securities, other	127
Total equity investments, other	(10)
Marketable securities, ending balance	237	506
Nonmarketable securities, ending balance	1,370	1,223
Total equity investments, ending balance	$ 1,607	$ 1,729

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