Investments - Other Segments and Holding Company (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Schedule of Investments
Investments	$ 2,310	$ 2,251	$ 2,310
Proceeds from sale of equity investment			90
Other Segments and Holding Company
Schedule of Investments
Investments	38	105	38
Portion of unrealized (losses) gains that related to equity securities still held		0	0	$ 0
Energy
Schedule of Investments
Investments	24	17	24
Proceeds from sale of equity investment	90
Energy | Other income
Schedule of Investments
Equity method investment on gain	24
Equity method investments | Other Segments and Holding Company
Schedule of Investments
Investments	24	91	24
Held to maturity debt investments measured at amortized cost | Other Segments and Holding Company
Schedule of Investments
Investments	11	11	11
Other investments measured at fair value | Other Segments and Holding Company
Schedule of Investments
Investments	$ 3	$ 3	$ 3