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Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investments
Fair Value	$ 1,075	$ 973
Long term investments	141	207
Unrealized gain (loss) on trading securities	13	39	$ (129)
BDC
Investments
Long term investments		68
Denominated in foreign currencies
Investments
Fair Value	40	18
Domestic equity securities
Investments
Fair Value	205	143
Foreign equity securities
Investments
Fair Value	98	96
Domestic debt securities
Investments
Fair Value	635	593
Foreign debt securities
Investments
Fair Value	102	120
Money market funds held in trading accounts
Investments
Fair Value	28	17
Other trading securities
Investments
Fair Value	$ 7	$ 4

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